I have the JA-1/99C luxury edition Jungson and it does sound very good, the pre-amp has a slight bit of harshness, that a Plinius M16 ($4500NZ$)didn't have. The Plinius also had more air around the instruments, but it did sound a bit lean in comparison. In my own system I have just placed my components on marble slabs and there is an immense improvement soundwise. I suggest the poweramp does like quite a bit of air around it and a very stable platform to sound it's best. I have heard powercable upgrades are also recommended, but I haven't experimented with these as yet.