WiiM Amp Ultra with external DAC?

[Burnside]

If I recall, it was in a thread with lots of measurements and graphs, and I don’t think it was a frequent poster who did them…

I’ll search high and low too

 

[Mr Ee]

If I recall, it was in a thread with lots of measurements and graphs, and I don’t think it was a frequent poster who did them…

I’ll search high and low too

Yep, and I don't think it was the Ultra Noise Shaping thread, which I did find and discounted as the one I was really looking for.

 

[Burnside]

If you search for ADC and 24/96, there are a few comments saying 24/192 measured poorly in comparison and that 24/96 is to be preferred, but I’m still struggling to find the actual post…

 

[Mr Ee]

I did find some posts about the pro plus and ADC with poor 16 bit conversion, but also note that the issues were addressed with firmware updates.
e.g.

O

Post in thread 'My WiiM Pro Plus (+) tests'

Jul 31, 2023

Part 6 - ADC performance:

Analog in - digital out:

ADI-2 will generate a reference analog signal and E1DA Cosmos ADC will work as the reference ADC.
Due to the features of the RME DAC, audio chain for testing the Pro Plus ADC can be quite simple :
REW (PC USB out) > ADI-2 USB in > ADI-2 analog out > Pro Plus analog in > Pro Plus toslink out > ADI-2 toslink in > ADI-2 USB out > REW (PC USB in)

Resolution of the ADC is controlled by the relevant digital output settings of the Pro Plus. The maximum allowed resolution of 192 kHz / 24 bit will be used. For all the...

• onlyoneme

• 

Still, 192 is overkill, and why not choose 24 over 16.
Ipso facto 24 / 96 is best

 

[DazST]

Thanks for your efforts. I played around with bit rates over the weekend (analog, optical and usb inputs) but can't say that I could detect any audible differences in terms of sound quality. If the source was 16/44.1 (cd or flac file) would you expect any audible difference setting the maximum to 24/96?