Speakercable and powercord that thightens bass.

PS, there are some other factors to the great sound quality these PC's are producing. I will tell you that there is alot of hard work in the process. I will call this alittle magic. There is alot of magic put into the new EXTREME REFERENCE. The sound is something quite special. Don O. DCCA Audio

TVAD, size does matter here! On power amplifiers these REF-1's create a pulse I have never quite experienced pryor to there installation on my BAT VK-500. Transformed this into a totally different beast in a very good way. The BAT came ALIVE. It's like going to a live performance every night in my own listening room. Don O. DCCA Audio

I agree with Don,My BAT500 came alive also.Even my Plinius
SA100,My ODDYSSEY Stratos came alive,the improvement
you hear is huge, thats what I have experience IMS,
and MARKr system.This pc will save you a lot of money,
you will forget upgrading your gear.Thanks