Fixed output resolution on USB

[Eoin]

Hi

Has anyone tried putting the USB output to ‘fixed’ eg 96/24 or 192/24?

I’ve an opportunity to try a little gadget which converts USB to SPDIF on Co-Ax. This is an unusual setup in that the gadget can use a clock output from my DAC - the whole setup requires a fixed resolution for input. Means 0 jitter.

There’s tech reasons why this is good but it needs the USB to be a fixed rate..

Anyone noticed any positive or negative effects from having the Wiim upsample?

 

[EddNog]

I haven't noticed any detriment to the sound, but I also don't have a $10K+ APx analyzer at my disposal to prove there's no absolutely no effect.

-Ed

 

[sNc]

I don't want to create a separate topic, so I will ask here, as it's connected with fixed output resolution.

If I don't use this feature, the original bitrate and kHz is sent to my DAC -> Topping Dx7Pro, and Dx7pro is the only Dac that is used in the audio track

If I set fixed resolution to 32bit and 96kHz -> my Topping isn't the only DAC that is used in the audio track, because DACin Wiim does this conversion to 32bit and 96kHz?

Am I understanding this correctly?

My impression is that when I don't force 32 bit, the sound is more flattened and doesn't resonate as much.... on the other hand, I would not want to unnecessarily use 2 DACs in one audio track

 

[hgo58]

I don't want to create a separate topic, so I will ask here, as it's connected with fixed output resolution.

If I don't use this feature, the original bitrate and kHz is sent to my DAC -> Topping Dx7Pro, and Dx7pro is the only Dac that is used in the audio track

If I set fixed resolution to 32bit and 96kHz -> my Topping isn't the only DAC that is used in the audio track, because DACin Wiim does this conversion to 32bit and 96kHz?

Am I understanding this correctly?

My impression is that when I don't force 32 bit, the sound is more flattened and doesn't resonate as much.... on the other hand, I would not want to unnecessarily use 2 DACs in one audio track

The WiiM DAC is only used if you use the analog output.

The sample conversion is done by the CPU.

The maximum bit depth you can set in the WiiM is 24 bits. So where do you force 32 bit?

Note that the WiiM resolution settings are for the S/PDIF interfaces only. Not the USB output. The USB resolution is defined by the initial connection between the devices.

 

[Mr Ee]

The WiiM DAC is only used if you use the analog output.

The sample conversion is done by the CPU.

The maximum bit depth you can set in the WiiM is 24 bits. So where do you force 32 bit?

Note that the WiiM resolution settings are for the S/PDIF interfaces only. Not the USB output. The USB resolution is defined by the initial connection between the devices.

Not exactly.. and they wrote fixed resolution which would force that rate / depth.

 

[hgo58]

Not exactly.. and they wrote fixed resolution which would force that rate / depth.
View attachment 22425

The USB audio protocol always uses 32 bits but the WiiM is documented to support up to 24 bits (192 kHz). So (I guess) the lower bites are just 0.

The actual resolution is defined by the external DAC.

 

[sNc]

Ok, perfect. I will then keep using fixed resolution 32/96. Thanks

 

[Burnside]

The USB audio protocol always uses 32 bits but the WiiM is documented to support up to 24 bits (192 kHz).

I guess both could be true - USB audio is 32 bit while PCM/digital audio is limited to 24bit.