[Fosi Co-Creation Challenge]DIY Modding Group | DIY, Your Way

[Fosi Audio Team]

Welcome to the Fosi Audio 8th Anniversary Co-Creation Challenge: DIY Modding Group!
This is your chance to show off your creativity, maker spirit, and love for HiFi. We’re calling on all users to share how you’ve customized your Fosi gear and inspire the next generation of innovation.

What’s the goal?
We want to make HiFi more personal and user-driven. Every mod, every tweak you make—helps shape the future of Fosi Audio products.

How to participate:
Reply to this post and include:
-Photos or videos of your modded Fosi gear
-A short description of your modifications (e.g. paint, shell customization, component swaps, circuit tweaks, lighting, control features)
-The inspiration behind your mod (optional)

Prizes:
Most Commercial Potential Award: $5,000 (1 winner)
Most Creative Award: $2,000 (1 winner)
Participation Prize: 20% OFF coupon

Timeline:
Submission Deadline: September 30, 2025
Winners Announced: October 30, 2025

How winners will be selected: Entries will be evaluated based on the following weighted criteria
Fosi Official Jury: 50%
Guest Judges (HiFi influencers): 30%
Community Likes & Comments: 20%

Let’s build the future of HiFi on your ways. Submit now!

 

[OliveAMMH]

Based on a rowing boat that was broken, I made a cabinet with a 8” sub + 2 focal speakers and a Fosi BT30D
Now this speaker is on my rowing club

 

[OliveAMMH]

Another one with another broken rowing boat. Same speakers but this time with a Fosi BT30 D pro

 

[OliveAMMH]

One more full wood cabinet with 10” sub focal speakers and still the Fosi BT 30D Pro

 

[JANGER]

My mods:
- added radiator on the top of V3 monoblock, mostly it is for visual because V3 is not becoming hot too much
- built audio spectrum analyzer in size compare to V3, it's simple well known Arduino with 1206 display in red version, the size of display limited the size of box, and I printed 3d both front and rear panel
- connected parallely to monoblock V3 just by speaker sockets
- finally each V3 monoblock got powered from separated power supply and by separated DC filter, and each got own mini table

I suppose such small equalizer display could become standard feature of monoblock. Need very thin of inner space.

 

[nickellback60]

- The SuperNova by LynnAudio - I have personally designed, hand-crafted & sold numerous SuperNovas to customers around the world! The SuperNova is a 50 watt ×2 (stereo) portable bluetooth speaker with a stereo-separated + dual passive radiator design.

This HiFi system runs off your guy's FosiAudio BT10A amplifier. With the FosiAudio amplifier & gold plated connections, the SuperNova delivers an immersive, efficient, & dynamic response despite its compact size. Perfect for all audiophiles alike - Providing audiophile-level tuning (adjustable bass, treble & master volume) & true stereo-separation, you can expect a real HiFi experience. The SuperNova isn't just loud - It's precise, delivering loud, studio-quality audio with undistorted deep bass that truly defies its size.

Construction & Tuning:
Constructed with 1/2" MDF & stereo separated (physical left/right enclosures). Sound treated internally with 1/8" closed cell foam & polyfill. Finished with speaker cabinet carpeting (doubles as exterior deadening). Each driver + passive has its own airspace of .04cbft - 7.3 grams of added weight to both passive radiators resulting in a tuning of 50hz.

Components:
●Fosiaudio BT10A Amplifier
●DaytonAudio 3.5" Full-Range drivers + passive radiators
● DaytonAudio 21v 10amp battery board + premium rechargeable 18650 lithium cells ×5
●Solderless 24k Gold plated Banana plugs ×4
●16AWG High-Strand copper wiring

Specs:
●Wide Frequency Range (50hz-18,000hz)
●Bluetooth 5.0 + 3.5mm Aux Input
●24+ hours of HiFi playback
●Universal 5v-24v charging input
●Adjustable Bass, Treble & Master volume

Dimensions:
13" Long × 6" Wide × 6.5" Tall

(I was inspired by other big name brands - I have purchased a few bluetooth speakers in my life & they never seem to fulfill my needs. In one way or another they always seem to fall short in some category, so I set out to design & craft my own bluetooth speaker to check all my "HiFi" boxes & I personally think I did a killer job!)

@Lynnaudio_ on TikTok for more!

 

[TrevorMcW]

Oh this is brilliant, I used to Row for Southsea Club (Portsmouth) back in the 1980's and then helped setup Milton Keynes in the late 1990's. When I retired from the club I was given one of the old clinker built coxed fours which stayed in my garage loft for years. I eventually renovated the stern in an obelisk form as a reminder of my rowing days, its complete with refurbished rudder gear, control lines (piano wire), and copper headed pins. Sadly the rest of the boat had to be disposed of due to space and time to create something else - your ideas here have made me long for my time with that old hull again. Well done.

Here is the stern of my boat, along side my main sound setup (the Fosi setup is in our new Kitchen diner) I'm gonna document what I have done there too, this is more of a technical upgrade than creative.

Coxed 4 Stern

 

[Martin Roscos]

Never have enough orange!
I particularly like the orange pattern glass board the system sits on!
Some orange rubber bands modify the feet and some orange caps cover the RCA terminals at the back.

 

[Audio Orbit]

Welcome to the Fosi Audio 8th Anniversary Co-Creation Challenge: DIY Modding Group!
This is your chance to show off your creativity, maker spirit, and love for HiFi. We’re calling on all users to share how you’ve customized your Fosi gear and inspire the next generation of innovation.

What’s the goal?
We want to make HiFi more personal and user-driven. Every mod, every tweak you make—helps shape the future of Fosi Audio products.

How to participate:
Reply to this post and include:
-Photos or videos of your modded Fosi gear
-A short description of your modifications (e.g. paint, shell customization, component swaps, circuit tweaks, lighting, control features)
-The inspiration behind your mod (optional)

Prizes:
Most Commercial Potential Award: $5,000 (1 winner)
Most Creative Award: $2,000 (1 winner)
Participation Prize: 20% OFF coupon

Timeline:
Submission Deadline: September 30, 2025
Winners Announced: October 30, 2025

How winners will be selected: Entries will be evaluated based on the following weighted criteria
Fosi Official Jury: 50%
Guest Judges (HiFi influencers): 30%
Community Likes & Comments: 20%

Let’s build the future of HiFi on your ways. Submit now!

Potfolia speaker + Herblissimo amp

The Potfolia is a DIY speaker featuring Chinese herbal medicine clay pot as enclosure, installed with Visaton B80 full range driver. The Herblissimo DIY Bluetooth amp is based on Fosi Audio ZK-1002 module, elegantly housed in an antique wooden box.

Note: The Potfolia ad shown below is just a prank. The speakers are not commercially available.

Demo videos
https://www.youtube.com/playlist?list=PL8G85l39cu5qBRhx8BG2LAhv63WOPQjId

The Potfolia "Lotus Edition" is an upgraded version with hand-painted lotus floral pattern inspired by traditional Chinese painting. The painstaking process begins with two primer coatings of homemade chalk paint to prepare the rough clay texture with a paintable surface. The intricate floral pattern is then outlined in black permanent marker. The most challenging part follows through with layers of colouring, shading and highlighting in acrylic paint, before it finishes with four coatings of satin varnish. The driver is Japanese Akisui 4" full range Model AS120FL42Ex.

Demo videos
https://www.youtube.com/playlist?list=PL8G85l39cu5pwcK2jAymwqbe44ySenuWV

 

[Audio Orbit]

“Colorama” audio system

The Fosi Audio ZK-1002T stereo (100W x 2) amplifier module based on TPA3116D2 chip and Bluetooth 5.0 receiver is a hidden gem! It’s perfect for my DIY amp and speaker system. The slim and compact Fosi module fits snugly into a transparent acrylic jewel box, which still has plenty of room for all the wiring and connectors. To pair with the transparent amp, I have a pair of cookie jars for the speakers. I could have stopped there. But then I thought I already created two pair of glass speakers, there’s no point in repeating myself a third time. What about adding some colours? How about Minions? Eventually I decided to ‘draw’ inspiration from my own painting. I duplicated a miniature for the acrylic box. Then I extracted two design patterns from the painting and hand painted the cookie jars. At last, a “Colorama” audio system that subtly, yet artistically, blends in with the décor.

Demo videos:

"Colorama" DIY speaker + Fosi Audio BT amp audition

DIY painted glass speakers with Aiyima 3” full range drivers Impedance: 8Ohm Rated output: 15W Frequency: 80Hz-20KHz Sensitivity: 87db (+/-3db) Voice coil: 2...

www.youtube.com

 

[f4mnect]

My little Bluetooth speakers.
Myself and about 20 buddies camp out in the desert once or twice a year. We are always trying to out do each other and the past years camping. So this year I found a pair of Peavy PR15's a guy was throwing away because they sounded bad. Time to get to work,replaced crossovers, replaced tweeters with JBL/Selenium D220Ti and subwoofer with Peavey Scorpion. Then stiffening the cabinet panels through bracing and dissipating vibrational energy through damping. Now I needed Bluetooth and to be able to power it with batteries. Had a Fosi Audio BT20A Pro, so I wired 2 M18 batteries in series to get 36volts. Runs for days, gets so damn loud and sounds amazing.

 

[Audio Orbit]

Qhilharmonic Qi is the first speaker system with 8-level variable Q control to harmonize with every recording in your prized collection.

A 3-inch full-range driver is complemented with a cylindrical enclosure made of cardboard tube measuring 3” in diameter and 36” in length. The narrow tubular configuration is perfect for bass and sound level augmentation, as we know from our childhood game of talking through cardboard tubes. And the exceptionally long and uniform linear space inside the tube offers unprecedented Q damping adjustability. Located at the lower half of the tube are three air vents in small, medium and large diameters, at 1/2-inch increment:

7/8 inch (Small)
1 3/8 inch (Medium)
1 7/8 inch (Large)

When all the three vents are closed, the Q factor is at the lowest, which means maximum damping, whereby the driver diaphragm movements are in tighter control, resulting in sharper definition, cleaner and brighter sound.

When all three vents are open, the Q factor is at the highest, which means minimum damping, allowing the driver diaphragm to move freely in large magnitude, resulting in richer low frequency resonance and the treble is more mellow.

In addition, by opening one of the three vents or a combination of any two vents, you’ll get a total of eight variable levels of Q control:
Level 1: All vents closed (Maximum damping)
Level 2: Small vent open (High damping)
Level 3: Medium vent open (High damping)
Level 4: Large vent open (Intermediate damping)
Level 5: Small and Medium vents open (Intermediate damping)
Level 6: Small and Large vents open (Low damping)
Level 7: Medium and Large vents open (Low damping)
Level 8: All vents opened (Minimum damping)

Why is Q control important? Because not every LP or CD is top rated audiophile recording. Very often, music lovers blame the room acoustics or speaker positioning for poor definition or not enough bass. Some audiophiles resort to super tweeters or subwoofers, silver cables or power conditioners. Others cover the listening room with unsightly acoustic treatment or even change the entire audio system. Part of the problem, if not the root of, is the Q factor of their speaker systems. No matter how meticulously set by the designer, the Q factor of any pair of speakers remains constant. Chances are it may not be in harmony with the sonic properties some mixing engineers have optimized for a given time at a given place, using different monitor speakers.

With the Qhilharmonic Qi speaker system, all music lovers would have absolute freedom and ease of control to tailor-make the Q factor, harmonizing with each and every recording for the best possible musical experience. With 8 levels of fine tuning at your fingertips, now that’s Q Intelligence. To accurately assess the tonal balance capability of the Qhilharmonic speakers, I need a neutral yet potent amplifier. And the Fosi Audio V3 is the perfect choice.

Demo videos:
https://www.youtube.com/playlist?list=PL8G85l39cu5rdBRJx2UxqM-j7H0v-p2QT

 

[ezeebuy]

Welcome to the Fosi Audio 8th Anniversary Co-Creation Challenge: DIY Modding Group!
This is your chance to show off your creativity, maker spirit, and love for HiFi. We’re calling on all users to share how you’ve customized your Fosi gear and inspire the next generation of innovation.

What’s the goal?
We want to make HiFi more personal and user-driven. Every mod, every tweak you make—helps shape the future of Fosi Audio products.

How to participate:
Reply to this post and include:
-Photos or videos of your modded Fosi gear
-A short description of your modifications (e.g. paint, shell customization, component swaps, circuit tweaks, lighting, control features)
-The inspiration behind your mod (optional)

Prizes:
Most Commercial Potential Award: $5,000 (1 winner)
Most Creative Award: $2,000 (1 winner)
Participation Prize: 20% OFF coupon

Timeline:
Submission Deadline: September 30, 2025
Winners Announced: October 30, 2025

How winners will be selected: Entries will be evaluated based on the following weighted criteria
Fosi Official Jury: 50%
Guest Judges (HiFi influencers): 30%
Community Likes & Comments: 20%

Let’s build the future of HiFi on your ways. Submit now!

Hi, I am happy to show off my Fosi audio collection, I have been more of a vintage audio person in the past as you will see in my photos. this system was built by me some years ago and still sounds fantastic! Well did until my Sansui pre-amp CA2000 and power amp BA2000 decided not to work, so now I have moved up to the NOW with FosiAudio.

TB10D
ZP3
LC30
MC331
TP-02
SP601
V3
Box x5

​

Colin

 

[TurkeyRobinson]

Welcome to the Fosi Audio 8th Anniversary Co-Creation Challenge: DIY Modding Group!
This is your chance to show off your creativity, maker spirit, and love for HiFi. We’re calling on all users to share how you’ve customized your Fosi gear and inspire the next generation of innovation.

What’s the goal?
We want to make HiFi more personal and user-driven. Every mod, every tweak you make—helps shape the future of Fosi Audio products.

How to participate:
Reply to this post and include:
-Photos or videos of your modded Fosi gear
-A short description of your modifications (e.g. paint, shell customization, component swaps, circuit tweaks, lighting, control features)
-The inspiration behind your mod (optional)

Prizes:
Most Commercial Potential Award: $5,000 (1 winner)
Most Creative Award: $2,000 (1 winner)
Participation Prize: 20% OFF coupon

Timeline:
Submission Deadline: September 30, 2025
Winners Announced: October 30, 2025

How winners will be selected: Entries will be evaluated based on the following weighted criteria
Fosi Official Jury: 50%
Guest Judges (HiFi influencers): 30%
Community Likes & Comments: 20%

Let’s build the future of HiFi on your ways. Submit now!

Robin here and thanks for the opportunity.
I’ll post my DYI audio workstation / organ conversion project separately, but my main commercially viable idea (that is a little controversial for true audiophiles), is to create a high quality “lossless” wireless transmitter and receiver combo, that can be retrofitted to older Fosi equipment and potentially built in to newer models of your amplifiers and speakers/headphones. Here are some photos of my real use case, using a cheap wifi transmitter / receiver, but it works surprisingly well. As you can see, your package would need to include any associated (short) cables, to help it connect neatly into your product (as opposed to the birds nest of cable wrapped around my Fosi i5s….still works though).

Similar products are the Jxsou R1, Nux B-7PSM etc.
Or check out Aiaiai audio’s upgrade kit to turn their older headphones into wireless ones.
Idea here though is getting the highest audio quality possible, in a form factor that makes it possible to clip to over-ear headphones like my example so cables are out of site, out of mind.
Of course a belt clip option for your IM4’s and musicians can roam the stage free, whilst receiving the house feed from the main mixing desk.

Even an optional special casing / moulding that fits neatly to the rounded bottom of the i5s (like some of the Hifiman wireless add-on options) would make it more specific for your audience and a great complimentary product (up sell).

I do appreciate the highest sound quality available and use wired connection where possible, however there is something liberating and calming about walking around the house whilst still experiencing high quality audio, which is exactly what I was doing with my “wireless” Fosi i5’s. Knowing it is a high quality “lossless” solution would make it that much more appealing.

Or for people who don’t have easy access behind a bookshelf to wire their speakers in properly, having a wireless option might be an attractive option.
You would need to consider the best protocol available in compact form factor, potentially the likes of PurePath Wireless (2.4GHz RF) via Texas Instruments CC85xx Series etc. Although some further research required as some say 2.4Ghz can be a crowded frequency band so other options may prove better (5.8GHz or UHF?)
Then obviously a low consumption device, with charging capability when connected to the device. Ie having USB input and output on future products would allow for charging adapters like this in the future.
Finally, keeping to your style and classy look, a small black aluminium casing with orange accents is a must!

 

[TurkeyRobinson]

My main DYI project was inspired by my family piano whilst also wanting to create a dedicated work space to create music, that would not take up a whole room.

I found a beautiful old organ that I decided to convert into a modern but antique looking Digital Audio Workstation.
The antique look and feel of the old organ not only matches our existing family piano, but works perfectly with the look of my Fosi i5s and GR70, especially the antique feel of the tube amps and the wood accents of the i5s, fit just perfectly.

I had to first gut the organ keybed, but kept the front fasciae and built this into a sliding draw to house my Arturia Keylab MIDI keyboard.
Due to the compact, modest, sleek look and feel I was going for I decided to compliment the setup with the new Adam Audio D3Vs. An unassuming setup when packed away, but packs a punch when my creative side comes out and the keyboard comes to life.
Although I didn’t specifically modify my Fosi devices directly, the overall theme i was going for aligns well with my GR70 and i5s, and hence why this is their new home. However, there are still plenty of “commercially viabable” options within the music studio” environment that Fosi may consider entering into, just like Topping recently did (that you can see in my photo E2X2 OTG)….eg Audio Interfaces (which I’m happy to discuss my wish list of features in more detail….one of which is a powerful, low noise headphone amplifier, which most of them struggle with).
Can probably also spot my Fosi Audio N3 portable Bluetooth amp.
Thanks again for the opportunity and good luck to all the participants….some great projects!
Higher res google photos album link:
Fosi Audio - Organ To DAW

Some examples here:

 

[Audio Orbit]

Full Dimensional Sound was a sound technology trademark used by Capitol Records in the 1950’s and after EMI acquired Capitol, it became the trade name of the reissued CD series under EMI Classics in the 1990’s. Full dimensional sound has always been the ultimate goal and real challenge for serious audiophiles. Conventional systems can only simulate full orchestral presence. Audio reviewers like to describe sound stage as holographic, and imaging as detailed. In fact it’s mostly illusional made-believe imagination. Just take a few steps back and ask yourself how many pieces of musical instruments a full orchestra are composed of, and how they are placed in a concert hall, and how the tone colour of one instrument is different from another, you really think one single pair of speakers can accurately deliver that full dimensional sound?

Liberate yourself from the so-called audiophile consensus and rules. Don’t restrict yourself to just one pair of speakers, no matter how sophisticated or expensive that may be. Mix and match different kinds of speaker designs. Same goes for the amps. Mix and match tube amps with solid-state amps. Full dimensional sound is not just the atmosphere and the ambience, it’s the ever-changing tonal colours and timbre resulting from that masterly blending of strings, woodwind, brass and percussion under the baton of a conductor. And now with this creative approach to full dimensional sound, you can be as close to standing on the conductor’s podium as you wish.

Mind you, full dimensional sound does not only benefit orchestral recordings. Many years ago, I attended a violin and piano duo recital in the Roy Thomson Hall, Toronto. World renowned violinist Gil Shaham and his pianist sister Orli attracted a full house audience. That night they performed exactly the same repertoire as their recently released “Dvořák for Two” album. Throughout their performance, I was paying special attention to the “sound stage”. The sound of the violin and the piano literally filled up the entire 2,630-seat concert hall. And I noticed that the “imaging” of the violin and the piano were much bigger than what I had experienced at home listening to the CD playing back on one pair of speakers. As soon as I got back home that night, I listened to the entire CD again and confirmed my findings. Likewise for piano recital. Playing back a piano solo recording with multiple speakers and multiple amps will give you the sound stage of a concert grand in a large concert hall. Playing back with a single pair of speakers will give you the sound stage of a grand piano in your listening room.

I didn’t plan to build this FDS system but the concept grew on me and it began to take shape round about the time of COVID lockdown. At present, it comprises of 14 pairs of speakers,13 of which are my DIY creations and the powertrains include 14 sets of amps. They can operate simultaneously with one single digital source (Oppo BDP-105), likewise for analog (Denon DP-59L turntable and DL302 MC cartridge). Extremely complicated connections are done through Y-splitters and switch boxes. It’s so complicated that I need to map out an operation diagram to help quick start the system. And it’s a relief when I discovered the Fosi V3. The AUX audio output on the rear panel makes daisy chain a breeze. Four sets of Fosi V3 have been incorporated in this system since 2024. I will not dismiss the possibility of adding more Fosi V3 in the future for full dimensional growth. Yes, there is still room for growth, and more DIY speakers are brewing.

About the following demo video playlist:

Please understand that the videos were shot and recorded with a simple Pixel 8a and by no means truly demonstrate the full dimensional sound intended. Nor the playback system you listen to can truly reproduce the sound quality in reality. However, for the sake of comparative audition, I have produced two recording sessions: One with the FDS system, and one with a single pair of my DIY speakers, the Orbit ONE.

Full Dimensional Sound:
Full Dimensional Sound - YouTube

Orbit ONE:
Orbit ONE - YouTube

 

[Lavida]

My main DYI project was inspired by my family piano whilst also wanting to create a dedicated work space to create music, that would not take up a whole room.

I found a beautiful old organ that I decided to convert into a modern but antique looking Digital Audio Workstation.
The antique look and feel of the old organ not only matches our existing family piano, but works perfectly with the look of my Fosi i5s and GR70, especially the antique feel of the tube amps and the wood accents of the i5s, fit just perfectly.

I had to first gut the organ keybed, but kept the front fasciae and built this into a sliding draw to house my Arturia Keylab MIDI keyboard.
Due to the compact, modest, sleek look and feel I was going for I decided to compliment the setup with the new Adam Audio D3Vs. An unassuming setup when packed away, but packs a punch when my creative side comes out and the keyboard comes to life.
Although I didn’t specifically modify my Fosi devices directly, the overall theme i was going for aligns well with my GR70 and i5s, and hence why this is their new home. However, there are still plenty of “commercially viabable” options within the music studio” environment that Fosi may consider entering into, just like Topping recently did (that you can see in my photo E2X2 OTG)….eg Audio Interfaces (which I’m happy to discuss my wish list of features in more detail….one of which is a powerful, low noise headphone amplifier, which most of them struggle with).
Can probably also spot my Fosi Audio N3 portable Bluetooth amp.
Thanks again for the opportunity and good luck to all the participants….some great projects!
Higher res google photos album link:
Fosi Audio - Organ To DAW

Some examples here:

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Great setup, wish I had time at the moment to use my DAW. What do you think of the i5s? Been thinking of getting them myself.

 

[Lavida]

View attachment 2235View attachment 2236

Robin here and thanks for the opportunity.
I’ll post my DYI audio workstation / organ conversion project separately, but my main commercially viable idea (that is a little controversial for true audiophiles), is to create a high quality “lossless” wireless transmitter and receiver combo, that can be retrofitted to older Fosi equipment and potentially built in to newer models of your amplifiers and speakers/headphones. Here are some photos of my real use case, using a cheap wifi transmitter / receiver, but it works surprisingly well. As you can see, your package would need to include any associated (short) cables, to help it connect neatly into your product (as opposed to the birds nest of cable wrapped around my Fosi i5s….still works though).

I do appreciate the highest sound quality available and use wired connection where possible, however there is something liberating and calming about walking around the house whilst still experiencing high quality audio.
Or for people who don’t have easy access behind a bookshelf to wire their speakers in properly, having a wireless option might be an attractive option.
You would need to consider the best protocol available in compact form factor, potentially the likes of PurePath Wireless (2.4GHz RF) via Texas Instruments CC85xx Series etc.
Then obviously a low consumption device, with charging capability when connected to the device. Ie having USB input and output on future products would allow for charging adapters like this in the future.
Finally, keeping to your style and classy look, as small black aluminium casing with orange accents is a must!

Awesome idea, love it! Been thinking of the i5s, but like the idea of a good wireless set too, so maybe a combination of both high quality audio and a wireless option. Definitely something I’d consider.

 

[Martin Roscos]

The blue light in my HEOS streamer just didn’t sit with the Fosi Orange.
Quick change makes all the difference!