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Good news, the probes arrived and the bias was found to be quite a way out on both channels: 7.9 mV (L) and 4.9 mV (R). Bias was adjusted and set at the recommended 15mV after 30 minutes. I also checked for DC voltage at the speaker terminals and both channels read around 0.5 mV. Re-checked a...

Just to give an update. Unfortunately a noise reappeared through the centre. Not convinced it sounds exactly the same as before, but certainly noticable from a distance, doesn't change with volume, and unfortunately intermittant. The amp was removed from the HT system, switched into stereo mode...

Definitely differences, not least the voltage. I have been to the States, but dont really know what they do with their plugs / wiring. Here we have "3 pin plugs", three rectangular pins that will only fit one way in a socket. Standardised wiring, brown = live, blue = neutral and yellow/green =...

I have had cases of hum with my HiFi, in particular in connection with the cartridge step up transformer. That really was a hum, but this sounded different, certainly a higher note, hence describing it as hiss. There is just one other thing in the back of my mind. At times when changing...

Cause found? It’s quite a pain in the butt getting to the cables at the rear of my rack. There is no access from the sides, simply no free space. When I installed the rack, the mains and speaker cables went in first (everything nice an orderly) then I started adding the equipment and...

It is irrelevant what the volume control does, the noise remains constant. However, it isn’t as bad now as when I first installed the Parasound in bridge mode. Tried two cables, XLO and Atlas Hyper Asymmetric. XLO still the worst. The Mark Grant remains silent. Pretty sure the cause has to be...

I didn't adjust the volume at the time John. I'll check and confirm.

Just sharing a recent experience. I have long been aware of the need to have a very “quiet” cable between the SUT and pre amp in my HiFi set up, but was rather surprised to find a background noise issue with the centre speaker when I recently switched my HT amplifiers around. Switching a...