Thanks for the advice. I'll try tweaking C1 and see if that makes a difference.

For what it's worth I'm using Sennheiser HD-580's with this amp.

I have a meta42 which has been completed for some time, and I currently have 4x 470uF (25v) caps in C2/C3 (2 per rail). I like this amp, but I've never been overly happy with the bass response. Is there any value to putting larger caps in C2/C3, and is it possible to have too much capacitance...

Thanks for all the help. I like the Gilmore amp, but the harderst thing for me would be coming up with a circuit board - I don't really like the idea of using prototype board. That's why I liked the Meta42 (I can just order one). I think I may end up using a led acid battery. That would...

I have recently bought a pair of Sennheiser HD-580's, and I want to build an amp for them (the Meta42). I've noticed that most headphone amps (including the Meta42) are designed to run on batteries. I assume this is not only for portability, but also sound quality. How much of an issue is...