My system has its power amps upstairs in a ventilated cupboard, they are the matching amps for ATC active 300scm, necessary due to noisy cooling fans. They are connected to my preamp with approx 15m of studio balanced interconnects, then the amps are connected back to the speakers through another 15m of studio speaker cables which ATC supplied for the instal. The irony is, that all this studio quality cabling can clearly show the differences between a short 1m length of balanced studio cable between my dac and preamp and a high quality 3k Dynamique Audio Zenith2 interconnect. The studio cabling doesn’t seem to be acting as a ‘sound quality’ filter, it’s still passing everything through. However when replacing the Zenith2 with a 1m length of the studio cable between dac and preamp, the sound takes a serious knock downwards. Is this magic at play. Maybe if I replaced all 30m of cables, which would necessitate pulling my house apart again and require a remortgage, I might gain further improvements, but that just ain’t gonna happen!!!