DAC K7 - Windows 11 - No bitrate control in UAC 1.0, no microphone at all in UAC 2.0, volume control changes on mode

[Kirjon]

Just got my K7 from Kickstarter.

On Windows 11;

In UAC 1.0 mode
- The only sound format available is 16 bit, 48kHz.
- This does enable a microphone input within Windows.
- Windows volume doesn't control anything; 0 volume is the same as 100 on the volume slider. Volume knob on the K7 is the only volume control

In UAC 2.0 mode
- The range of sound formats available are 24-32 bit, 44.1-384kHz.
- No microphone input device is enabled.
- Windows volume control does work now, independently of the volume knob on the device.

Why is UAC 1 locked to 16 bit, 48kHz, why is there no microphone at all in UAC 2, and why does the method of volume control change between them?

 

[MrMout]

Hello,
same problem here, so replying to get answer as well

i would also like to mention that when in UAC2.0, I have a warning in the device manager

 

[MuVyDaD]

Same issue here, hope there is a fix for this, very dissapointing.

 

[MrMout]

Is anyone from Fosi who’s looking at this forum?

 

[reykjavi]

Is anyone from Fosi who’s looking at this forum?

Sorry, every last one of us is busy building our brand new K8 DAC. It's in our DNA!
Please show your mercy support and back us on Kickstarter on this!

 

[Salastro]

Same problem here. Very strange, Windows volume worked at 1. use, but now Windows volume doesn't control anything; 0 volume is the same as 100 on the volume slider.

 

[jvdjube]

Is there any fix for this yet?

 

[summer]

Hello,
same problem here, so replying to get answer as well

i would also like to mention that when in UAC2.0, I have a warning in the device manager

View attachment 1741

If your K7 DAC is functioning normally for audio playback, no immediate action is required. However, to ensure optimal performance, you can try uninstalling the “Fosi Audio DFU” device, then restart your computer to see if it correctly recognizes the K7 afterward.
If issues persist, you can install the driver from this link: https://drive.google.com/file/d/1iPPlEBmS_Z5lZx01wHqbDp3cTVrj-dUS/view?usp=sharing (The same as the ZD3).

 

[summer]

• The microphone only supports 16-bit / 48kHz due to the chip design.
• In UAC 1.0 mode, system volume doesn't affect output because K7 locks volume at max to support DSD playback—volume must be controlled via the K7 or music player. However, in some cases with PCM files, system volume may still work.
• UAC 2.0 (USB 2.0) enables high sample rate playback (up to 384kHz, DSD), but this conflicts with the microphone, which only supports 16-bit/48kHz. So mic input is disabled in UAC 2.0 mode.

Just got my K7 from Kickstarter.

On Windows 11;

In UAC 1.0 mode
- The only sound format available is 16 bit, 48kHz.
- This does enable a microphone input within Windows.
- Windows volume doesn't control anything; 0 volume is the same as 100 on the volume slider. Volume knob on the K7 is the only volume control

In UAC 2.0 mode
- The range of sound formats available are 24-32 bit, 44.1-384kHz.
- No microphone input device is enabled.
- Windows volume control does work now, independently of the volume knob on the device.

Why is UAC 1 locked to 16 bit, 48kHz, why is there no microphone at all in UAC 2, and why does the method of volume control change between them?

View attachment 1739

View attachment 1740

View attachment 1739

View attachment 1740