Having just acquired a nice pair of cans to use in my room (Sennheiser HD570) I'm wondering about a cheap headphone amp since the output on my mini-system is weedy to say the least. To save some cash I'm wondering about a DIY model - there's plenty of online info about the CMOY and MINT but I'm quite interested in a collected kit as I'm a little out of practice with these things although not completely devoid of electronics knowledge from my physics degree. I was also wondering if the Sonic-T amp could be used in such a way or would it be too powerful to use in this way? If it works and is as good as people claim then it could be headphone bargain of the year. Edit: Just done a bit of reading and although people have used the Sonic Impact T-amp for headphones it requires a fair bit of modification as it outputs a large amount of ultrasonic frequencies. So I go on to wonder about using something like this BK offering which could well be overkill!