Thanks all for your sympathy :boohoo:
I guess I was always playing with fire buying speakers called "Diablos"! >)
Cno absolutely no blame laid at you mate, I had already made my purchase before we started chatting on the subject. I was pleased to meet another person who had reached the same conclusion as me independently.
However if my Akurate DS self combusts I might be flying over to have words!
When I get a moment I will start a new thread but the way I see it, it's either a dud unit (hopefully) or there is some gremlin in the system. The fact that it was the other chanel on the amp that went certainly makes me think that it is the culprit. Every other component, including the AV receiver, is functioning correctly.
One of the techs from the dealership helped me put the system back together after the previous repair, so at least from their perspective they have been able to see that it is not some obvious problem related to incorrect installation.
I dropped everything back to the dealer yesterday & went straight to the boss & laid out my situation. I told him that I was expecting the amp to be replaced this time & not repaired which he seemed to be receptive to. I think that the decision may not be his in the end but the distributor, they've asked for a couple of days to assess the problem.
Bottom line is that I need to be 100% certain that it is not the system that is causing the failure. At this point in time I have grave reservations about wrangling a new unit out of them, plugging it in & having a repeat performance. So coming up with a methodical end to end test which covers circuit, source components, interconnects, amps/reciever, speakers.
1) Circuit: have a dedicated circuit for the system, maybe need another one for the AMS. Have a surge protection unit both in the switch board & a plug in for the AMS. Have had an electrician check all cabling from the main distribution board / my sub board / powerpoint. No issues.
2) AV reciever: seems like a possible candidate. Given that it is connected to the AMS with RCAs from the front outputs, maybe an issue with the outputs? (has been working perfectly up until now).
3) Oppo BDP-93: another possible candidate: is connected via HDMI to the AV & plasma, also via RCA to the AMS. Perhaps some sort of issue having it connected to the AMS via two pathways?
4) Audioquest leads: highly unlikely, but the audioquest RCA leads & speaker cables have a small battery pack on them. I omly mention this as a possible source of DC current?