My 4B-ST runs Hot

Joysjane,
I have the Legacy Convergence, which were rated by Legacy as having the same sensitivity as the Focus. Audio magazine reviewed the Convergence and measured their sensitivity at 92db. Legacy seems to include room gain in their figures. I still love em !! (the speakers). My OCM 500 amplifier runs around 115 degrees with these speakers. At 130 degrees things become to hot to hold your hand on.

You mentioned that the amp seemed hotter on the right side of the top. The 4B-ST is a symmetrical construction, with the heat sink modules each containing a separate channel of amplification, with the twin toroid amps occupying the center of the chassis. The only other factor I can think of that might cause excessive heat on one side (given the symmetrical internal layout) is a badly adjusted DC offset. I think your problem merits a call to Bryston, since excessive heat will decrease the life of the solid state parts and output transistors.

My 4B-ST runs warm on the top and warmer on the sides as there is little space between the heat sinks and the sides of the cabinet. Never too hot to touch but the sides do get verrrry warm...

Argent, have you tried swapping the amps input cables left for right to see whether their are any sources issues? Ie now the left side is hotter than the right. Similiar experiment would be to swap left for right speaker leads (with source correctly connected) to isolate whether there are any "load" issues. This info will probably be useful if you talk with Bryston.

My speakers have a 90 dB efficiency, 8 ohms nominal impedance, recommend 110 watts for amp power. The 4B-ST should kick them around the block no problem. The funny thing about all of this--Bryston is the distributer for PMC monitors in the US and Canada. PMC uses Bryston amplifiers when they test their speakers. I thought I was buying the best possible match for my amp. Oh well, I'll just put a bag of ice on the amp and it'll be fine. Just kidding :) I forsee a call to Bryston in my immediate future. Hopefully the amp will not be out of my life for long. By the way, if you all have never heard of PMC speakers, you should check them out. You might find it interesting to know that PMC (Professional Monitor Company) boasts that about 90% of all CDs made are mastered on systems using PMC monitors. Thanks for all the help.