George,

Keep in mind he had everything powered through the power conditioner. The power conditioner has a 15 amp transformer (most likely higher output impedance than the transformer on the street pole). He also never tied directly into the wall which should help quite a bit. One circuit 14awg in the wall should be OK as long as he doesn't have a really long ranch home with the system at the other end from the electrical breaker box. My house is 56 feet long and the wiring in the walls adds to that length. The far end of the house would cause excessive voltage sags under dynamic conditions from several amplifiers. Sustained loud music (25 minutes is a pretty long time) with constant voltage sags would cause the amplifiers to over heat. I say he should try AC power directly into the wall and crank it up. Just to prove this is or isn't the cause.

Ron

HT: 568.2mm (Revelation One filter), 518x2, SB3, Bryston 7BSTx3, 8BST, Aerial 10T, CC3, SW12(Qty2) w/SVS AS-EQ1, MK Tripole x4. JVC RS1u, DVDO Duo, Oppo 103 w/Vanity103HD, Sony PS3, VIP 3D Theatre, Acer H5360. Logitech Ultimate Remote and Hub.