[jsjohnst]

I got 3/6 right using the iPhone XR built-in speakers (other three were 320k). I then tried it again with someone else clicking the buttons (in case they weren’t randomized order) using my DAC/amp and headphones and got 5/6.

The thing that gives it away for me is the extreme highs and lows, both are clipped when compressed usually. I should note, I wasn’t picking which “sounded better”, but rather which “sounded uncompressed”. Several of the tracks sounded better at 320k than they did uncompressed to me. Despite being rather close to 40, I am still able to easily hear sounds well over 20kHz.