Does anyone know of a DIY headphone amp   that I can buy that is inexpensive?  - I want to get some practice before ordering the crack. Id hate to spend the money on the crack kit and ruin it..    Thanks all!

I Currently have the Sony MDR-7506 they sound great, but they are a little too bright for me - I like everything else about them, but the highs can get a little piercing and annoying if wearing them for a while.   Can anyone recommend a similar spec'd headphone with a more tamed treble?     ...

I have a Roladn FP-80 digital piano. Through headphones it sounds awful. Very muddy with a spike in the low mids that gets very tiring to listen too.    I am using the SONY mdr 7506 headphones directly to the headphone jack - Typically these headphones are on the bright side so the muddiness...