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RE: Should I consider an Adcom GFA-555?

Posted by ampreometric on January 5, 2012 at 12:50:39:
I've had four older Adcom 555 amps. They are very decent amplifiers ad powerful. Take care tho if you end up with a pair and bridge them in mono for bi-amping. When bridged in mono the amplifier "sees" your speaker load as half. 8 ohm speakers will be seen as 4ohm. 4ohm as 2 ohm. And if your speakers dip below 2ohm, well.......
I found this out the hard way. A pair of speakers I have can dip to 2 ohms which means the Adcom was trying to drive a 1 ohm load! Smoked the amp needless to say but still, the 555 is a very good amplifier. I wouldn't really consider the 545, but that's just my personal preference.