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View Full Version : Adcom gfa-545 bridged?

scubamike
12-12-2005, 01:17 AM
How much power does an Adcom gfa-545 put out bridged. I am wanting to bridge one to power my csi5 center channel.
RuSsMaN
12-12-2005, 01:39 AM
It doesn't bridge. Try bi-amping with it.
george daniel
12-12-2005, 06:40 AM
I believe that Russ is correct, I've owned two and they can't be bridged(no switch) like the 555's. :)
unc2701
12-12-2005, 11:13 AM
I've seen one, but I don't know if it was modded. Regardless, it'll be about double the 4ohm unbridged, so ~350-400
heiney9
12-12-2005, 11:55 AM
A standard--unmodified GFA-545 cannot in any way be bridged. It may come close to doubling output at 4 ohms, but that in no way means it's bridgeable.
Bridging is a completely different animal and requires a different build archtechture (sp). The 555 can be switched to bridged mode. It was built/designed that way from the factory.

FWIW

H9
scubamike
12-12-2005, 10:29 PM
If I cant bridge a 545 then what do you recomend for my csi5? My front rti150s will be powered by a gfa-5800 and my rear surround rti100s by a gfa-5500. Just trying to match power output, etc.
heiney9
12-13-2005, 01:01 AM
If I cant bridge a 545 then what do you recomend for my csi5? My front rti150s will be powered by a gfa-5800 and my rear surround rti100s by a gfa-5500. Just trying to match power output, etc.

Well here is the problem....the GFA-5xxx series have Mosfet outputs and the GFA-5xx have bi-polar outputs. Now IMO, the center channel is where you will notice the difference the least. You could always go with a GFA-555 in bridged mode for the center channel (a bit overkill) if you ask me. But it would work out very well. The diff in output types would be the least noticeable having the center channel using the bi-polar (GFA-555) amp. You will never be at a loss for power (in any channel) using this configuration. :cool:

FWIW,

H9
RuSsMaN
12-13-2005, 01:12 AM
......Try bi-amping with it.

....
heiney9
12-13-2005, 01:16 AM
............or you could bi-amp with the 545..........
scubamike
12-13-2005, 09:08 AM
How would I bi-amp with the 545, would I just y coming out of receiver, then left to one speaker post and right to the other. Would this be enough power for that speaker or would I be better off with the 555