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Using Adcom GFA-555s as monoblocks to power magnepan 3.3s in active biamp

Yeah, a long title but it says it all.  Presently I have my rebuilt Magnepan 3.3rs actively biamped through a Marchand active crossover, then using 2 stereo amps to power bass and mid/treble respectively.

I am considering taking two Adcom GFA-555s and bridging them and using one each to power the bass panels of the maggies. 

Since the Magnepans are 4 ohm rated, however it's only the bass panels I'd be powering, what are your thoughts on stability?

Appreciate the help.  Don't need suggestions on "selling all my amps and buying one bigger one" - I have a lot of different amp options but am a tinkerer and want to see if the power of a bridged adcom would be good to control the bass panels. 

jji666

Showing 1 response by kingsleuy

kingsleuy's avatar
kingsleuy
181 posts
 

Personally, I would not do it.  My experience (repairing) with Bridging amplifiers is they become very unstable when powering low impedance speakers and driving them hard.  If a 16 y.o. tells you to "turn it down", I suspect you are driving them hard.  States nominal 4 ohms.  Some speakers dip below the 4 ohms.  Especially on the bottom end.  You will be lucky to just blow fuses.

But hey!  Sacrifices must be made in order to Rock and Roll.   It's only electronic gear.  Not like it is the last pair of amplifiers in existence. With trepidation I would say go for it.  Rock On!   LOL  I just remembered, the last bridge set I blew, I was playing Mahler.  I don't know why I assumed Rock.

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