Quote: Well i just assumed that the buffers were like op amps, so slot right in. So they need additional dip module, with a resistor in tow. But after speaking to ron, i think i'll plump for his topkit, it'll come with what im after and them some, should keep me happily tinkering for quite some time And like you say ron is a top chap, so i don't doubt it's an excellent package. Quote: Well it's what most with the P4 seem to choose, im enjoying the AD797 it's opened up the sound a treat, so the OPA627 and HA5002's should be rather special. And if it's not to my liking, at least i'll have others to try.