I’ve been playing around with the different op amps in the Zishan between the (AD797, Opa627 & ADA4637) and I gotta tell ya I’m amazed at what these little suckers can do!
For starters, the ADA4637 is a steal for 10 bucks and can be sourced at Arrow. (Do your ears a favor and go get two!) You’ll need two of them but it’s well worth the investment for what you get back. It’s obviously successfully plagiarized from the Opa637 but at 3x less.
What’s remarkable about it, is it’s set at +6db and there’s NO distortion. None! At low volume it can pick up nuances and with hardly any noise or distortion.
My grand concept for the Zishan would be put soic to dip adapters and have three different op amps and experimenting with combination sounds the best. Objectively I have to “match” the op amps with similar performance so that it doesn’t throw of timing, pitch, etc. so the hear test will go first then a comparison with specs.
It would be SUPER cool if I had the know how to use the op amps as switches like pickups in a guitar so you can get different sounding playbacks from “clean” to “sustain” or in this case the qualities of the individual op amps! But that would require electrical knowledge to do so and have it correspond with firmware.
Ah one can dream though... [\Spoiler]