Submitted by Acceptable-Exit-9212 t3_11xvoqu in headphones
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2000.01Hz sine 48kHz playback - Quarks DSP acoustic pitch jumps and is out-of-tune.
Output pitch is garbage no matter which playback device or samplerate is used. Based on various comments this is a systematic design issue and not invidual faulty unit. This is sad as it indicates that nobody tested these devices before manufacturing and shipping to customers. The problem was clearly evident after first tens of seconds listening.
SupOrSalad t1_jd6n6ce wrote
On my review of them, I found that every couple seconds the group delay would have a spike where it would delay more than the rest, and then work it's way back, before having a spike again. As well, in the FR you would see a spike or dip in SPL when this happened as well. This was consistent with time, so if you measured it quickly, it would happen once, but if the sweep was much longer, you'd see repeating patterns of this. It's definitely something weird with the dac in it. As well, yeah the pitch seems to keep shifting