Help needed solving amplifier problem/mystery


Hi all,
I'm hoping to get some advice solving a mystery with sporadic amp performance... I'm using a Spectron Musician Hybrid 2 amplifier - 500 watts x 2 with PSB Gold i speakers, Denon 2900 CDP and a Promitheus Audio passive preamp. Also use a Panamax 5300 power conditioner and the Spectron is plugged directly into the wall. Generally I'm very happy with my "working man’s" 2-channel system. But periodically my right speaker works only very faintly where I barely get any sound - but I do hear very soft music – about 5% the volume of my other speaker. If I continue to play music for an hour or so the problem goes away and all is good. This happens every month or so and I can't figure it out. I've troubleshot/isolated the problem to the right channel of my Spectron amp (it's not the source cd player, speaker, speaker cable or ic cables, so I am deducing it is the amp). My Spectron is under warranty - I sent it in for repair and they could not find any problems with the amp. I did not have this problem again after receiving the amp back from Spectron (about a month ago now) until today. Any thoughts or suggestions as to my problem and how to fix it would be greatly appreciated!!

Many thanks!
canjo07
Any chance the speaker cables or interconnects on the right side of the amp working lose? I had a heavy interconnect cable work lose and it took me months troubleshooting the problem.
It kind of sounds like a bad component in the crossover of the right speaker. I had a pair of Linn speakers that did the same thing and drove me crazy. It ended up being a bad crossover.
Lapierre, the speaker and ic cables are tightly connected. Mofimadness, I'd agree with you on the crossover, except when I swap speaker cables the problem moves to my left speaker. When I swap speaker cables and ic's, the problem stays with the right amp channel. thanks for the advice though!