![peavey usb audio interface peavey usb audio interface](https://images.reverb.com/image/upload/s--x-KjYakU--/f_auto,t_large/v1562036919/upkdsjtldljutkxqagkd.jpg)
Hello, I see this is a somewhat older thread and maybe nobody will see this post, but I joined to comment. I was surprised how well my measurements matched Amir's Audio Precision measurements (1khz 0.0190% vs 0.0188%): Using my Motu as an ADC into Arta (0.00019% THD+N analog inputs as tested here on ASR), I ran a couple THD+N tests from the Peavey's output.
#Peavey usb audio interface full#
Getting 655mV full scale into the transformer primary, with 635mV out of the secondary, and 460mV out of the final XLR output jack after the resistor network
![peavey usb audio interface peavey usb audio interface](https://c1.zzounds.com/media/productmedia/fit,2018by3200/quality,85/AIR-192-14_Top_hires_808522-751a3b9e8679d42c7d891e2a39feaad4.jpg)
I've updated the image with the proper cap valueĪs for headphone mode, I'm not sure, this isn't my area of expertise - but going through the datasheet, I don't see any way of switching output modes - there's just the one DAC output of Vout Right and Vout Left - it seems for headphone applications you're supposed to tie in to the built in headphone amplifier Vcc and AGNDs, which are unused on this peavey board as far as I can tell Click to expand.I thought the capacitance of that component seemed odd, and like the note says it was unlabeled so I measured in situ and guessed - I just removed it and measured it and they're 0.022uf caps so that'd be a -3db freq for that RC of ~48khz? Makes sense that it's a 0.022uf, as now *all* those components match TI's example schematic exactly, everything up to the transformer input instead of a line out jack in TI's example.