I've inherited some 20-year old Audiolab units: 8000C Pre-Amp 8000CDM CD Player 8000DAC Converter 8000P Power Amp I've set them up with a reconditioned Pink Triangle LPT1. OK, the CD player door doesn't open – never mind; probably a simple fix for later – with the CDM feeding into the DAC, then the DAC and the LPT1 wired into the Pre-Amp (C), which then wires into the Power Amp (P). The LPT1 plugs into the MC sockets on the Pre-Amp. And the sound is pure mud (and I don't mean the 70s band). Even with the bass turned to minimum and the treble on max, it's barely listenable. I don't pretend to any expertise. So, what novice error have I made?