My 4B-ST runs Hot

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.

Alright, just a follow up. I put the amp through the paces tonight for about an hour. It stays cool for about two songs (rock, R&B) at a pretty good volume. Then it begins to warm up pretty steadily, favoring the right side of the amp. After about an hour of playing, moderate to loud volume (classical, single vocalist and small assortment of instruments) I checked out the amp. The left side of the amp is merely warm, both the heat sinks and top of the amp are the same temperature. The right side of the amp is too hot to leave a hand on for long. The heat sinks on the right side are scalding also. The heat is present from the front of the amp to the back of the amp on the right side. I did not record the temperature as I do not have a thermometer to check it with, but I figure it was pretty damn hot if I couldn't leave my hand on it. Now, the interesting thing is that when I stop the music, the right side of the amp slowly returns to the same warm state the left side of the amp is at. I plan on calling Bryston soon.

Mullen, glad to hear you love your Legacy's. My wife and I love ours also. An increadible improvement over the Kappa's. Hoping Argent finds out his problem. I'm starting to upgrade and am considering the same amp he is running. Hey, us Legacy owners are at a minimum around here... keep on enjoying!

Argent, there is something wrong with the amp. It is not your load. It is in need of repair if it gets that hot on one side.

Argent, I had the exact same "problem" with the 4BST as you have: The right side of the amp was damn hot! It was happen a month ago. I called Bryston, they suggest that I should switch the speaker cables. And then I found out that I connected the channel1 with right speaker and channel 2 with left speaker; also with my interconnect as well. But I have used the 4BST like that for almost 2 years with no problem. I thought that maybe the problem now, so I correct the connection: Channel 1 connect to left speak and channel 2 connect to right speak and also changed the interconnect. The funny thing is, after that, the right side become pretty steadily as normal as the left side?! Since then, I don't have the warm problem with the right side of the amp. And I don't have any idea why...?