Here I feature my favorite chassis build of all time , the COS Engineering D1 DAC/PRE.
The fact that this design has a single rotary knob on front that performs all functions including power on / off is a dream of design for me. There is nothing more simple. more elegant to me. For sound comparison we use the Playback Designs MPD-8, In my opinion no DAC sounds better so far. The designer invented Sample Rate Conversion., He probably knows a thing or two. I do some comparison songs then play some "just for fun" tunes..

COS D1 MPD-8

EW & F 9:08 18:47
80s compression 11:28 20:13
MOD 12:36 21:20
Blues 13:49 22:37
Female Vocal 15:14 24:25
Orchestral 16:23 25:45

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