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Preamp Q8 Desktop DAC Preamp Development Log

Fosi Audio Team

Fosi Audio Team

Administrator
Staff member
Hi Fosiphiles,

We’re thrilled to officially kick off this thread with exciting news: Q8, one of our most anticipated upcoming products, is finally in development!

Born out of last year’s anniversary co-creation campaign with our community, Q8 is a product that truly embodies your ideas, feedback, and passion. In this thread, we’ll be sharing the latest updates on its progress — from early design concepts to engineering breakthroughs.

As always, your voice matters. The Fosi product team will be here to listen, discuss, and explore your suggestions. Whether it’s a technical detail or a user experience insight, your feedback will help us refine Q8 into something extraordinary.

Brief Introduction:
The Q8 is a multi-input, multi-output DAC preamplifier equipped with both LPF and HPF functions. Designed for users with multiple audio sources or AVR systems, it serves as a powerful system control hub that brings all your devices together seamlessly. It also helps AVR users build a dedicated 2.1 HiFi system with ease and flexibility.

Here is the rendering sketch of the Q8
1749114725618.png

Basic Specs
Input:USB-C, Optical, Coaxial, Phono RCA, RCA*2, Sub-In, HDMI Arc with CEC, Bluetooth
OutputRCA, XLR, Sub-Out
TriggerIn and Out
FunctionsLPF, HPF, Tone Control with Bypass, EQ
In-Built DACAKM AK4493S
Sampling Rates32bit/768kHz+DSD512(USB), 24bit/192kHz(OPT, COA, HDMI), 24bit/96kHz(BT)
Bluetooth ChipQCC3095
Bluetooth CodecsAAC, SBC, aptX, aptX-HD, aptX-LL, aptX-Adaptive, LDAC，aptX Lossless
Remote Control✅

Product Manager in Charge: @Charles

Let’s continue building it together!
 
Last edited:
What happened, Team Fosi??? Did you interfere with my dreams?
I think that nowadays, having a device that makes implementing a 2.1 system easier is mandatory. I really wouldn't change ANYTHING. I just hope it has a volume control with a maximum and minimum (I really hate the infinitely rotating ones).
I think the choice of the AKM DAC chip, the inputs and outputs (an additional optical one wouldn't hurt, as Jimbob points out), the internal power supply, the master switch on the back, the triggers are totally right.
And of course, the icing on the cake: the HPF and LPF filters.
P.S. The size and aesthetics are perfect! Is it a rack unit? Looking at the front, I'd just put an on/off button on the front as well.
In any case, it's all good news. I look forward to further developments regarding this development.
Cheers, Team!
 
If I have to improve it I will ask for 5.1 output in order to use SACD / DVD AUDIO discs and DSD.files in multichannel format.
 
The unit looks great and not many changes recommended physically other than the ones suggested above. In terms of the display when used as preamp it should show the volume in large font for easy reading from a distance. Hope it comes with a basic remote for changing volume and input selection.
 
If I have an active subwoofer with its own low-pass filter (LPF), does that mean the one that comes with the Q8 would be useless to me, or am I wrong
 
Dafunk5555 said:
Will there be different options for the display or will it be static info display?
Click to expand...
I don't quite understand what you mean. Besides static volume, input mode, and sampling rate, do you want to display anything else? Is it convenient to explain in detail?
 
zek2024 said:
Something like this ...
View attachment 1823
Click to expand...
Our current definition of knob operation is as follows:
1. Press and hold for 2 seconds to shut down
2. Click: Power on
3. Clockwise/counterclockwise rotation: increase/decrease volume
4. Click: Enter the secondary menu

Can you accept the above operation? Do we still need a separate switch button?
 
Carlos Arana said:
If I have an active subwoofer with its own low-pass filter (LPF), does that mean the one that comes with the Q8 would be useless to me, or am I wrong
Click to expand...
You can also turn off LPF, which means you have an additional RCA input port and can connect an additional audio source device.
 
Hi @Charles — I always wonder about the use of displaying the sample rate. The selected input is much more important information, that should be biggest on the display.

I too slightly prefer a dedicated power button, though it’s not a deal breaker. I think a modest, orange button like on the Fosi x5 would look nice on the left.

To be honest, since having tasted room correction I would not put a (pre)amp in my living room without it.
 
Hi @Charles, gentlemen.

Personally, I still prefer a dedicated button to power the device, plus a energy cut-off switch on the back (please do not deviate from the original design)
Would this increase the price much? I don't think so, and if it's only a few dollars, I think we can agree that a limited-rotation knob dedicated only to volume up/down is much better in any case.
As for the power supply, I don't think it should be a cost-cutting factor. It's important to remember that a preamp is, in my opinion, one of the most sensitive links in the audio chain.
Selfishly, I'd save money on the phono stage. Virtually every vinyl lover I know will end up adding an external phono stage to any amplifier or preamp that already has one. I hope I don't offend anyone, but that's what I've actually noticed.
Anyway, just my opinions, and I hope this product comes out soon.
Cheers!
 
Charles said:
Our current definition of knob operation is as follows:
1. Press and hold for 2 seconds to shut down
2. Click: Power on
3. Clockwise/counterclockwise rotation: increase/decrease volume
4. Click: Enter the secondary menu

Can you accept the above operation? Do we still need a separate switch button?
Click to expand...
I hear @Karlaka’s thoughts and completely understand where he is coming from. In my setup a switch at the back would prove tricky for access so I could accept a switch in the front. Especially if it was made an orange feature. To match ZD3 though I’m thinking power control via volume dial. It works for me - unless it reduces noticeable sound quality
 
I agree with your point of view. The information on this display screen is just a randomly selected display content. In fact, we may place the volume at the most important position. I would like to ask if you have any suggestions about the content displayed on the screen. If possible, please describe the information you want to display and arrange its importance level. Of course, it would be even better if it could be represented by pictures. Anyway, thank you very much for your suggestion.
joostdh said:
Hi @Charles — I always wonder about the use of displaying the sample rate. The selected input is much more important information, that should be biggest on the display.

I too slightly prefer a dedicated power button, though it’s not a deal breaker. I think a modest, orange button like on the Fosi x5 would look nice on the left.

To be honest, since having tasted room correction I would not put a (pre)amp in my living room without it.
Click to expand...
 
Karlaka said:
Hi @Charles, gentlemen.

Personally, I still prefer a dedicated button to power the device, plus a energy cut-off switch on the back (please do not deviate from the original design)
Would this increase the price much? I don't think so, and if it's only a few dollars, I think we can agree that a limited-rotation knob dedicated only to volume up/down is much better in any case.
As for the power supply, I don't think it should be a cost-cutting factor. It's important to remember that a preamp is, in my opinion, one of the most sensitive links in the audio chain.
Selfishly, I'd save money on the phono stage. Virtually every vinyl lover I know will end up adding an external phono stage to any amplifier or preamp that already has one. I hope I don't offend anyone, but that's what I've actually noticed.
Anyway, just my opinions, and I hope this product comes out soon.
Cheers!
Click to expand...
Thank you for your suggestion. We are also considering whether to add a separate power button. We would like to ask why it is necessary to maintain the toggle switch of the power input port at the back since the product's switch status can be controlled at the front? Regarding the understanding of the volume limit switch, does it mean that you want a potentiometer knob? This type of knob is prone to slight pitch deviation at low frequencies. What is your opinion on this?
 
Charles said:
does it mean that you want a potentiometer knob? This type of knob is prone to slight pitch deviation at low frequencies.
Click to expand...
Don't use a potentiometer, use an electronic volume control, to avoid non-linearity at low volumes.
It would be good if there was a balance adjustment option - left/right channel.
 
It will be a good option if the screen can display the volume only when to put it up/down, just for 5 seconds. And then display the input source, Khz/bits...
 
Hi @Charles.
In my case, I find a master switch useful, for example, when there are thunderstorms and a power surge could occur. Implementing this type of switch on the back ensures that the power doesn't reach any sensitive areas of the device.
On the other hand, what I propose for volume control is a potentiometer of the highest possible quality, one that doesn't have infinite rotation. On my vintage equipment, or even on the Fosi V3 stereo or T20 I have, I think this is an excellent implementation. In fact, the level scale could easily be silkscreened on the front panel. The feel of this type of potentiometer is extraordinary, and they allow for very fine adjustments. For example, the volume control on the WiiM Ultra is a terrible disaster and has received many negative reviews from users.
 
I have a ZD3 and two ZA3 in mono paired with Emotiva XB2. ZD3 are connected with XLR cables to the two ZA3. The rca out of the ZD3 is connected to a Polka Signature ES12 sub with a build in LPF. What I would like from the Q8 is to remove the lower frequences of the XB2 speakers. So that each speaker is only playing from 130hz and up.
 
adamvondory said:
I have a ZD3 and two ZA3 in mono paired with Emotiva XB2. ZD3 are connected with XLR cables to the two ZA3. The rca out of the ZD3 is connected to a Polka Signature ES12 sub with a build in LPF. What I would like from the Q8 is to remove the lower frequences of the XB2 speakers. So that each speaker is only playing from 130hz and up.
Click to expand...

This will be possible thanks to the implementation of the high-pass filter, or HPF. It really looks like a more than interesting product.
 
zek2024 said:
Don't use a potentiometer, use an electronic volume control, to avoid non-linearity at low volumes.
It would be good if there was a balance adjustment option - left/right channel.
Click to expand...
Yes, we plan not to use a potentiometer, but we do design a balance adjustment function.
 
adamvondory said:
I have a ZD3 and two ZA3 in mono paired with Emotiva XB2. ZD3 are connected with XLR cables to the two ZA3. The rca out of the ZD3 is connected to a Polka Signature ES12 sub with a build in LPF. What I would like from the Q8 is to remove the lower frequences of the XB2 speakers. So that each speaker is only playing from 130hz and up.
Click to expand...
Yes, it's possible. If you don't need so many interfaces with ZD3, you can also purchase our ZP3 directly. ZP3 has HPF function and two adjustable modes (80 and 120Hz).
 
It is more useful to have a RCA preout and a RCA line out
As a general matter every subwoofer has a plate amplifier and adjustable sub frequency adjustment and it looks like the rca outs have defeat switches which is great but just making it a line out is most useful with or without the LPF option and very few are using passive subwoofers
 
Last edited:
Fosi Audio Team said:
Hi Fosiphiles,

We’re thrilled to officially kick off this thread with exciting news: Q8, one of our most anticipated upcoming products, is finally in development!

Born out of last year’s anniversary co-creation campaign with our community, Q8 is a product that truly embodies your ideas, feedback, and passion. In this thread, we’ll be sharing the latest updates on its progress — from early design concepts to engineering breakthroughs.

As always, your voice matters. The Fosi product team will be here to listen, discuss, and explore your suggestions. Whether it’s a technical detail or a user experience insight, your feedback will help us refine Q8 into something extraordinary.

Brief Introduction:
The Q8 is a multi-input, multi-output DAC preamplifier equipped with both LPF and HPF functions. Designed for users with multiple audio sources or AVR systems, it serves as a powerful system control hub that brings all your devices together seamlessly. It also helps AVR users build a dedicated 2.1 HiFi system with ease and flexibility.

Here is the rendering sketch of the Q8
View attachment 1822

Basic Specs
Input:USB-C, Optical, Coaxial, Phono RCA, RCA*2, Sub-In, HDMI Arc with CEC, Bluetooth
OutputRCA, XLR, Sub-Out
TriggerIn and Out
FunctionsLPF, HPF, Tone Control with Bypass, EQ
In-Built DACAKM AK4493S
Sampling Rates32bit/768kHz+DSD512(USB), 24bit/192kHz(OPT, COA, HDMI), 24bit/96kHz(BT)
Bluetooth ChipQCC3095
Bluetooth CodecsAAC, SBC, aptX, aptX-HD, aptX-LL, aptX-Adaptive, LDAC，aptX Lossless
Remote Control✅

Product Manager in Charge: @Charles

Let’s continue building it together!
Click to expand...
Love this design! Love the High Pass and Low Pass filter. There aren't alot of preamps with bass management and so this will differentiate your product against the competition. I strongly suggest having adjustable gain (i.e. low, medium, high). Also, having the option of changing Op-amps (i.e. Sparkos, Burson) will appeal to those audiophiles who enjoy tinkering.
 
My two cents:
  • The display should show, in order of importance, the currently selected input as legible as possible from the listening position, the current volume as legible as possible from the listening position, the sampling frequency, the type of digital input (PCM, DSD).
  • On/off control by pressing the volume knob is perfectly adequate
  • the proposed design of the chassis is simple and elegant and matches the Fosi style
  • I agree with the request for two optical inputs (in my case, one for TV and one for a chromecast audio streamer)
  • Linear power supply is a nice to have but not necessary (the improvement in sound quality compared to a really good switching power supply is all to be proven)
  • I agree with @Karlaka, audiophiles will always prefer to use an external phono preamplifier, and they certainly wouldn't like RIAA equalisation done in the digital domain. We can do without the phono input to save some money or, instead of the phono input, it is better to have a second balanced input
  • Finally, the presence of a parametric equaliser would make this new unit very complete and competitive
 
Last edited:
derekinla said:
Love this design! Love the High Pass and Low Pass filter. There aren't alot of preamps with bass management and so this will differentiate your product against the competition. I strongly suggest having adjustable gain (i.e. low, medium, high). Also, having the option of changing Op-amps (i.e. Sparkos, Burson) will appeal to those audiophiles who enjoy tinkering.
Click to expand...
We are preparing to adopt the universal standard gain of 6dB. Generally speaking, 6dB should be compatible with most devices now, right? Or is there any special case where different gain levels are very important to you?
 
I think that it would be great to have some vent holes on the side as the ZA3 have but also some vent holes on top of the chassi for those who upgreade there unit with other opamps
 
adamvondory said:
I think that it would be great to have some vent holes on the side as the ZA3 have but also some vent holes on top of the chassi for those who upgreade there unit with other opamps
Click to expand...

I understand that a preamp shouldn't generate so much heat that it requires extra vents. But maybe I'm wrong. Personally, I'd prefer not to have them unless absolutely necessary and the unit is as sealed as possible to prevent dirt from entering.
 
marcoevang said:
My two cents:
  • The display should show, in order of importance, the currently selected input as legible as possible from the listening position, the current volume as legible as possible from the listening position, the sampling frequency, the type of digital input (PCM, DSD).
  • On/off control by pressing the volume knob is perfectly adequate
  • the proposed design of the chassis is simple and elegant and matches the Fosi style
  • I agree with the request for two optical inputs (in my case, one for TV and one for a chromecast audio streamer)
  • Linear power supply is a nice to have but not necessary (the improvement in sound quality compared to a really good switching power supply is all to be proven)
  • I agree with @Karlaka, audiophiles will always prefer to use an external phono preamplifier, and they certainly wouldn't like RIAA equalisation done in the digital domain. We can do without the phono input to save some money or, instead of the phono input, it is better to have a second balanced input
  • Finally, the presence of a parametric equaliser would make this new unit very complete and competitive
Click to expand...
Hi, Marco!
  1. Agree.
  2. Disagree. Dadicated button so far better!
  3. Agree!
  4. Agree.
  5. I really don't know.
  6. Thanks! No phono stage = less costs.
  7. It's likely to be a good addition.
 
Karlaka said:
Hi, Marco!
  1. Agree.
  2. Disagree. Dadicated button so far better!
  3. Agree!
  4. Agree.
  5. I really don't know.
  6. Thanks! No phono stage = less costs.
  7. It's likely to be a good addition.
Click to expand...
Haha we aren’t getting anywhere with a dedicated on/off button vs using the knob. It’ll have to be a surprise when it’s launched!
Everything else spot on
 
I'm excited for this one, it looks great! On any product that is likely to be positioned underneath a TV (given the hdmi input), I would like options for the display brightness, including the option to turn off the display when not in use e.g. comes on when adjusting volume then fades out when done. This is common on AV products from brands like LG and Sony, where you can turn off all visible lights (including power LEDs, should they exist) to avoid distracting the viewer from what's on the TV screen.

The front power button + multi-function dial works for me and I also second the comment about the need to include some kind of peq / room correction facility, if it's to be on par with the competition. Personally I wouldn't ever touch the volume control dial on a device like this one, and so would place greater importance on a high-quality / well designed remote control, over having an expensive volume control (if it's a choice).
 
davmol said:
I'm excited for this one, it looks great! On any product that is likely to be positioned underneath a TV (given the hdmi input), I would like options for the display brightness, including the option to turn off the display when not in use e.g. comes on when adjusting volume then fades out when done. This is common on AV products from brands like LG and Sony, where you can turn off all visible lights (including power LEDs, should they exist) to avoid distracting the viewer from what's on the TV screen.

The front power button + multi-function dial works for me and I also second the comment about the need to include some kind of peq / room correction facility, if it's to be on par with the competition. Personally I wouldn't ever touch the volume control dial on a device like this one, and so would place greater importance on a high-quality / well designed remote control, over having an expensive volume control (if it's a choice).
Click to expand...
Yes, we have a screen brightness selection function and also support automatic screen shutdown after 2 minutes of inactivity. At this time, the screen will completely turn off and there will be no indicator lights that will light up.
We currently do not have a separate power switch button, and this product does not have room correction function, which would require much higher costs.
 
We would like to ask if everyone needs Bluetooth function?Do you also need the function of built-in turntable amplifier?
 
For me Bluetooth is not a must as the audio quality is not on par with other inputs. Even phono preamp its always preferred to be dedicated than in-built it will just add cost to the unit.
 
Charles said:
We would like to ask if everyone needs Bluetooth function?Do you also need the function of built-in turntable amplifier?
Click to expand...
i think bluetooth must be an standar feature in every modern pre-amp/DAC,

My whis list:

- 2 optical inputs
- 2 Coax inputs
- 2 RCA inputs
- 1 HDM/Arc input
- 1 usb-c input
- 1 XLR stereo Input
- 1 bluetooht Antena

- 1 XLR stereo Output
- 2 RCA output
- 2x 12v triger out
- 1 triger -in

In the front panel

- The same volume/switch control of the ZD3 (in the extreme right like the ZD3)
- A power button in the left
- Bass and treble controls
- A big display to show data and possible virtual VU (like de Ayima A80)
or two circular display like the ZD3 but with the resolution to make a virtual VU

- Headphone Banlance out
- Volume control for the headphone

- the same Op-amp interchange option of ZD3/ZA3

A crazy idea must be the power supply can be change like a Nintendo Switch control. This permit to integrate to the same equipment, but make the option to use a Linear power supply without open the equipment. Or make one with auxiliary power for a CD/DAB+/etc.

A long list, but the dreams can be make reality :)
 
I really like this and would prefer this than the new pre amp coming out soon but all these new devices are just so large for my PC desk setup. All I need is USB audio in from PC, DAC, balanced out pre amp, sub out with bass management for mains and headphone out, Bluetooth and a remote. This looks perfect but it's just so much I don't need or use PERSONALLY for me. Just me rambling cuz this is a great product and good job with it so far. Hopefully they make something a little more compact comparable to focusrite interfaces like solo or 4i4
 
VilmFilm said:
I really like this and would prefer this than the new pre amp coming out soon but all these new devices are just so large for my PC desk setup. All I need is USB audio in from PC, DAC, balanced out pre amp, sub out with bass management for mains and headphone out, Bluetooth and a remote. This looks perfect but it's just so much I don't need or use PERSONALLY for me. Just me rambling cuz this is a great product and good job with it so far. Hopefully they make something a little more compact comparable to focusrite interfaces like solo or 4i4
Click to expand...
I like the size and look of the ZD3, only for me lacks of a RCA input to be a perfect small equipment.

maybe anew ZD3 with the additional RCA could be a big it for a lot of users searching a small footprint equipment.
 
el_pop said:
I like the size and look of the ZD3, only for me lacks of a RCA input to be a perfect small equipment.

maybe anew ZD3 with the additional RCA could be a big it for a lot of users searching a small footprint equipment.
Click to expand...
Do you need HDMI input? If not needed, you can consider our ZH3 with RCA input.
 
el_pop said:
i think bluetooth must be an standar feature in every modern pre-amp/DAC,

My whis list:

- 2 optical inputs
- 2 Coax inputs
- 2 RCA inputs
- 1 HDM/Arc input
- 1 usb-c input
- 1 XLR stereo Input
- 1 bluetooht Antena

- 1 XLR stereo Output
- 2 RCA output
- 2x 12v triger out
- 1 triger -in

In the front panel

- The same volume/switch control of the ZD3 (in the extreme right like the ZD3)
- A power button in the left
- Bass and treble controls
- A big display to show data and possible virtual VU (like de Ayima A80)
or two circular display like the ZD3 but with the resolution to make a virtual VU

- Headphone Banlance out
- Volume control for the headphone

- the same Op-amp interchange option of ZD3/ZA3

A crazy idea must be the power supply can be change like a Nintendo Switch control. This permit to integrate to the same equipment, but make the option to use a Linear power supply without open the equipment. Or make one with auxiliary power for a CD/DAB+/etc.

A long list, but the dreams can be make reality :)
Click to expand...
I would like to ask what specific function do you mean by bass management? Does it refer to LPF, HPF, or other more complex functions?
 
Charles said:
I would like to ask what specific function do you mean by bass management? Does it refer to LPF, HPF, or other more complex functions?
Click to expand...

only a button to boost the bass like the front buttons on the ZP3, but on the LPF or HPF filter, a cut frecuency switch could be enough.

if we think the sub-bass has a range of 20Hz - 60Hz, the bass has 60Hz - 250Hz and the low-mid has 250Hz - 500Hz could be a switch with this 3 options. But the settings of bass are based in each user preference, and is impossible to cover all user preferences.
 
@Charles - Fosi need to keep the phone input - save the vinyl! I can see others views on removing it, but they obviously don't have records or a record player, which are becoming popular again.
 
Please fosi make this but much smaller. Balanced outs and a pair of RCA for whoever needs those. RCA sub out. USB audio in. People like me just want a simple 2.1 setup and only mainly use a PC. I don't have 3 separate input sources that I need to switch. Just my PC and Bluetooth for offline listening is all I need for my studio monitors and (in the future SVS subwoofer).
 
Charles said:
We would like to ask if everyone needs Bluetooth function?Do you also need the function of built-in turntable amplifier?
Click to expand...
I would add basic phono (low cost as much is possible) and same for BT.
Audiophiles won't use phono, but turntables are popular now, even when are not used. Phono stage same quality like in basic turntables sold by AT or whoever is good enough for starters, and probably not to much expensive.

Who use streamer, won't use BT for music - except when is kids party and you need to play kids music from YouTube or something like that, then you need basic BT.
 
I've heard Bluetooth being used in mesh and/or piconet configuration; enabling wireless multi-device connectivity.
Would this be an in-demand or a useful feature for those who'd rather not run wires for multi-channel/multi-speaker setup?
Personally, I'd choose more USB ports over multiple SPDIF interfaces.
Is the current design include simultaneous (XLR+RCA) outputs? Should it?
Can the analog inputs routed thru the BT circuit for ADC function and routed to one of the USBs?
Orange volume knob has always been cool but that little edge indent is impossible to see or feel... as always...:unsure:
 
Hi,
The Q8 looks good, but I have not read about any software control interface(s). Is this to be via BT, or (preferably) via LAN/Wifi ?
If I have missed these details I apologise!
 
Hi,

I would like to see the option of automatic switching of the active input.

If the preamp is also to be used in combination with an AVR as a pre-out for the main speakers, it would definitely be useful to be able to set the input sensitivity and pass-through volume.

Typical scenario:
Source 1: CD or streamer (volume active, EQ adjustable)
Source 2: AV receiver pre-out (sensitivity adjusted once according to AV, volume fixed at 100% or passthrough, no need to manually control the preamp. Everything is controlled by the AV.)

When the movie starts, HDMI-CEC wakes up the receiver, the receiver wakes up the preamplifier with a 12V trigger, and the sound switches the active input and sends the signal to the power amplifiers (in my case, to V3 mono), which also wake up.
 
Fosi Audio Team said:
Hi Fosiphiles,

We’re thrilled to officially kick off this thread with exciting news: Q8, one of our most anticipated upcoming products, is finally in development!

Born out of last year’s anniversary co-creation campaign with our community, Q8 is a product that truly embodies your ideas, feedback, and passion. In this thread, we’ll be sharing the latest updates on its progress — from early design concepts to engineering breakthroughs.

As always, your voice matters. The Fosi product team will be here to listen, discuss, and explore your suggestions. Whether it’s a technical detail or a user experience insight, your feedback will help us refine Q8 into something extraordinary.

Brief Introduction:
The Q8 is a multi-input, multi-output DAC preamplifier equipped with both LPF and HPF functions. Designed for users with multiple audio sources or AVR systems, it serves as a powerful system control hub that brings all your devices together seamlessly. It also helps AVR users build a dedicated 2.1 HiFi system with ease and flexibility.

Here is the rendering sketch of the Q8
View attachment 1822

Basic Specs
Input:USB-C, Optical, Coaxial, Phono RCA, RCA*2, Sub-In, HDMI Arc with CEC, Bluetooth
OutputRCA, XLR, Sub-Out
TriggerIn and Out
FunctionsLPF, HPF, Tone Control with Bypass, EQ
In-Built DACAKM AK4493S
Sampling Rates32bit/768kHz+DSD512(USB), 24bit/192kHz(OPT, COA, HDMI), 24bit/96kHz(BT)
Bluetooth ChipQCC3095
Bluetooth CodecsAAC, SBC, aptX, aptX-HD, aptX-LL, aptX-Adaptive, LDAC，aptX Lossless
Remote Control✅

Product Manager in Charge: @Charles

Let’s continue building it together!
Click to expand...
Thank you Thank you
Fosi Audio Team said:
Hi Fosiphiles,

We’re thrilled to officially kick off this thread with exciting news: Q8, one of our most anticipated upcoming products, is finally in development!

Born out of last year’s anniversary co-creation campaign with our community, Q8 is a product that truly embodies your ideas, feedback, and passion. In this thread, we’ll be sharing the latest updates on its progress — from early design concepts to engineering breakthroughs.

As always, your voice matters. The Fosi product team will be here to listen, discuss, and explore your suggestions. Whether it’s a technical detail or a user experience insight, your feedback will help us refine Q8 into something extraordinary.

Brief Introduction:
The Q8 is a multi-input, multi-output DAC preamplifier equipped with both LPF and HPF functions. Designed for users with multiple audio sources or AVR systems, it serves as a powerful system control hub that brings all your devices together seamlessly. It also helps AVR users build a dedicated 2.1 HiFi system with ease and flexibility.

Here is the rendering sketch of the Q8
View attachment 1822

Basic Specs
Input:USB-C, Optical, Coaxial, Phono RCA, RCA*2, Sub-In, HDMI Arc with CEC, Bluetooth
OutputRCA, XLR, Sub-Out
TriggerIn and Out
FunctionsLPF, HPF, Tone Control with Bypass, EQ
In-Built DACAKM AK4493S
Sampling Rates32bit/768kHz+DSD512(USB), 24bit/192kHz(OPT, COA, HDMI), 24bit/96kHz(BT)
Bluetooth ChipQCC3095
Bluetooth CodecsAAC, SBC, aptX, aptX-HD, aptX-LL, aptX-Adaptive, LDAC，aptX Lossless
Remote Control✅

Product Manager in Charge: @Charles

Let’s continue building it together!
Click to expand...
Great News, a FOSI Audio DAC with XLR inputs and outputs. Waiting patiently for the early release.
 
Would this have a Pure Mode/Direct Mode/Defeat function, to disable all internal processing, for near zero latency? It would be perfect for Studio Purposes as well if thats the case.
 
Hello Charles, this is a great design. I already ordered the ZP3. With this new product, can you make the high and low pass filters adjustable? Like the Emotiva PT2 pre amp? About power supply, I know it's not ideal for everyone, but it could be external and leave the option for normal or linear. I do believe the linear one would get this product to the next level
 
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Charles said:
I don't quite understand what you mean. Besides static volume, input mode, and sampling rate, do you want to display anything else? Is it convenient to explain in detail?
Click to expand...
Is that confirmation that the screen will have an indicator of the current volume level (unlike the unfortunate blind ZP3 volume control)? That is the most important thing for the screen to display, IMO. Should be large and readable from a distance. Everything else is secondary.
 
Charles, an additional comment. Most of budget turntables have built-in phono pre amp, and those with higher quality record players own high quality separate phono preamps. IMO this is a feature you could skip. Same for VU meters, so people looking for those can get the LC30. I love the slim/clean looks of the prototype.
 
Charlese, I would like the project to include a trasparent line out, not affected by volume control or other active stages, to which I could connect a second independent amplifier. This would allow me to eventually add another pair of speakers in strategic positions within my setup, providing greater flexibility in listening or expanding the soundstage in larger or more complex environments.
 
Good afternoon, gentlemen.
I partially agree with what Massimo says.
I find the phono stage absolutely unnecessary in 99% of cases. I really don't know any vinyl record enthusiast who, either starting out or over time, doesn't use a dedicated external phono preamp. This unnecessarily increases the cost of the final prototype. Analog VU meters do this too, but I must say I love them! It's a personal taste that I think many people share.
Regards!
 
Charles said:
Yes, we have a screen brightness selection function and also support automatic screen shutdown after 2 minutes of inactivity. At this time, the screen will completely turn off and there will be no indicator lights that will light up.
We currently do not have a separate power switch button, and this product does not have room correction function, which would require much higher costs.
Click to expand...
Thank you but can I suggest the auto screen shutdown option has a much shorter timer than two minutes? In a scenario where I am watching TV and I turn up the volume up or down, then I would expect the display to come on and show the changes, and then no more than 10 seconds after the last command being sent the display should shut down again. Two minutes is way too long just to acknowledge a volume or input change etc. Thanks, product is looking great.
 
davmol said:
Thank you but can I suggest the auto screen shutdown option has a much shorter timer than two minutes? In a scenario where I am watching TV and I turn up the volume up or down, then I would expect the display to come on and show the changes, and then no more than 10 seconds after the last command being sent the display should shut down again. Two minutes is way too long just to acknowledge a volume or input change etc. Thanks, product is looking great.
Click to expand...
or like the ZD3 you can have a button in the remote control to turn off the screen.
 

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I've looking for similar products in order to be able to centralize my sources.

My ideal setup goes like this: Turntable + CD Player + Streamer. Turntable goes to external phono preamp, streamer goes to external DAC through optical. Also TV goes to external DAC though HDMI or optical 2. And then, everything goes through one RCA output to speaker amplifier, and another RCA output to headphone amplifier.

I consider FiiO K7, SMSL RAW MDA1, SMSL DL100, Fosi P4... everyone has one defect or another. For example, the SMSL DACs are almost perfect, but they don't have RCA input to passtrough the internal DAC and use them as a preamp. FiiO K7 has RCA and digital, but doesn't have HDMI nor a second optical, so I would need to buy a TOSLINK selector. Fosi P4 is perfect as a source selector, but it does have just one RCA output, and none headphone amplifier. I know Topping has some headphone amplifier models with RCA passthrough, but I would prefer to have those audio chains separated. Fosi ZP3 looks ALMOST perfect to centralize sources while using another DAC, but it has just one RCA output! How do I add the headphone amplifier if my speaker amplifier doesn't have XLR? RCA is still the most common used connection, besides XLR popularity.

Fosi Q8 looks almost perfect, but I think it would be benefited if you consider some things already mentioned in this thread:

1. You should add another RCA output. 2 speaker amps, 1 speaker amp and 1 headphone amp... it's not expensive or complex. Having the option to listen through headphones for all your sources it's not just amazing, but essential. Having kids or living on apartment, sometimes at night you can't make too much noise. Headphones are a necessity.

2. Don't add a phono preamp input. Really, don't do it. There's two type of people who use a turntable: new ones and old ones. New ones has a turntable with built in phono, and if they don't, they already have an external phono that's probably better. Old ones definitely have an external phono. You already have Fosi X5!

3. Keep bluetooth, LDAC and aptX adaptive compatible. It won't be useful to me, but it's a standard today for this type of products. You would be surprised if you know how many audiophiles still uses bluetooth because it's convenience. If you promote that your bluetooth connection pass through the AK4993 DAC, you will have another consideration to buy Q8.

4. You should add another optical input. For example, if you want to use TV + gaming console, TV goes through optical and gaming console (Xbox Series X, for example) goes through HDMI. You want to avoid using TV as an intermediary through console and DAC, because of delay. So, considering that, where do you connect your streamer, then? Second optical! Same applies for a blu-ray player or even CD Player that for some reason doesn't have coaxial out.

5. Consider an integrated headphone amp. For me, it would make your product totally perfect. But you shouldn't make choices for one or two potential buyers. If you do, amazing, but a second RCA out would be enough.

I'll stay tuned for updates. I'm excited!
 
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Charles said:
We are preparing to adopt the universal standard gain of 6dB. Generally speaking, 6dB should be compatible with most devices now, right? Or is there any special case where different gain levels are very important to you?
Click to expand...
Matching gain levels between a pre-amp and an amp will:
A. Enable use of a power amp's full range.

B. Assist in avoiding a situation where the pre-amp's output may be overpowing and therefore make fine adjustment control of the power amp difficult.

C. It's not just about the Pre-amp's signal output. It's about source signal strengths too. For example not all HDMI sources will provide the same signal strength.

On another note, will the HPF be applied to the XLR output as well? The image seems to constrain it to the RCA.

Addition of a USB-C power output only will allow powering of the new VU meter you have in development without adding the need for another power source.
 
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alaperse said:
I've looking for similar products in order to be able to centralize my sources.

My ideal setup goes like this: Turntable + CD Player + Streamer. Turntable goes to external phono preamp, streamer goes to external DAC through optical. Also TV goes to external DAC though HDMI or optical 2. And then, everything goes through one RCA output to speaker amplifier, and another RCA output to headphone amplifier.

I consider FiiO K7, SMSL RAW MDA1, SMSL DL100, Fosi P4... everyone has one defect or another. For example, the SMSL DACs are almost perfect, but they don't have RCA input to passtrough the internal DAC and use them as a preamp. FiiO K7 has RCA and digital, but doesn't have HDMI nor a second optical, so I would need to buy a TOSLINK selector. Fosi P4 is perfect as a source selector, but it does have just one RCA output, and none headphone amplifier. I know Topping has some headphone amplifier models with RCA passthrough, but I would prefer to have those audio chains separated. Fosi ZP3 looks ALMOST perfect to centralize sources while using another DAC, but it has just one RCA output! How do I add the headphone amplifier if my speaker amplifier doesn't have XLR? RCA is still the most common used connection, besides XLR popularity.

Fosi Q8 looks almost perfect, but I think it would be benefited if you consider some things already mentioned in this thread:

1. You should add another RCA output. 2 speaker amps, 1 speaker amp and 1 headphone amp... it's not expensive or complex. Having the option to listen through headphones for all your sources it's not just amazing, but essential. Having kids or living on apartment, sometimes at night you can't make too much noise. Headphones are a necessity.

2. Don't add a phono preamp input. Really, don't do it. There's two type of people who use a turntable: new ones and old ones. New ones has a turntable with built in phono, and if they don't, they already have an external phono that's probably better. Old ones definitely have an external phono. You already have Fosi X5!

3. Keep bluetooth, LDAC and aptX adaptive compatible. It won't be useful to me, but it's a standard today for this type of products. You would be surprised if you know how many audiophiles still uses bluetooth because it's convenience. If you promote that your bluetooth connection pass through the AK4993 DAC, you will have another consideration to buy Q8.

4. You should add another optical input. For example, if you want to use TV + gaming console, TV goes through optical and gaming console (Xbox Series X, for example) goes through HDMI. You want to avoid using TV as an intermediary through console and DAC, because of delay. So, considering that, where do you connect your streamer, then? Second optical! Same applies for a blu-ray player or even CD Player that for some reason doesn't have coaxial out.

5. Consider an integrated headphone amp. For me, it would make your product totally perfect. But you shouldn't make choices for one or two potential buyers. If you do, amazing, but a second RCA out would be enough.

I'll stay tuned for updates. I'm excited!
Click to expand...
4. 2nd optical input - discussed at start of thread. Good shout
 
Hello.
I understand that the potentiometer on the HP and SUB sections allows you to adjust the crossover frequency and it won't be fixed.
Each system/room requires a different setting.
Regards
 
VilmFilm said:
Please fosi make this but much smaller. Balanced outs and a pair of RCA for whoever needs those. RCA sub out. USB audio in. People like me just want a simple 2.1 setup and only mainly use a PC. I don't have 3 separate input sources that I need to switch. Just my PC and Bluetooth for offline listening is all I need for my studio monitors and (in the future SVS subwoofer).
Click to expand...
We have a product ZD3 that meets your needs. It comes with XLR and RCA outputs, and you can use RCA to connect the subwoofer. And it comes with Bluetooth and USB input.
 
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