I posted about this earlier (a month or so ago) and now I,ve fixed the problem. The Issue was I couldn't listen to some CDs - too much bass, where as others were OK. The problem was most apparent with Akon and Amy Winehouse. The solution was so simple and I found it by accident when playing with cables and things. It was to connect the sub from one preamp output and my left and right amps from the other output, rather than going through the sub and the difference is amazing. I have clean clear solid bass that really rocks. I didn't realise that the bass was in a fog before. I'm going through most of my music collection again and cant believe the life that is in some tracks. I can even play Amy Winehouse and Akon now - Bliss!!