I'm going to try amping my decade-old HD495's but I'm cheap. Ten years ago, it was recommended to amp these cans to get best performance (they rated better than SR-60's when amped, but were bested by the Grado's un-amped). I've decided to go this route rather than get new cans because I'm going to need an amp anyway for anything better than these 495's.
Since I'm cheap..
1) is a CMoy better than one of those ubiquitous Fiio E1 / E3 / E5?
2) I'm thinking of rolling my own using an amp kit from ebay. The kit has Burr-Brown OPA2604's. How do these compare to the Fiios?
3) of the pin-compatible replacements for the OPA2604, which are most recommended? OPA2132, AD826, LM6172 ?
I know the OPA2134 is also pin-compatible and beats them all, but at $25+ each, not exactly something I'd like to try on a whim.