Adcom gfa-545 bridged?

scubamike
scubamike Posts: 60
edited December 2005 in Electronics
How much power does an Adcom gfa-545 put out bridged. I am wanting to bridge one to power my csi5 center channel.
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  • RuSsMaN
    RuSsMaN Posts: 17,986
    edited December 2005
    It doesn't bridge. Try bi-amping with it.
    Check your lips at the door woman. Shake your hips like battleships. Yeah, all the white girls trip when I sing at Sunday service.
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  • george daniel
    george daniel Posts: 12,096
    edited December 2005
    I believe that Russ is correct, I've owned two and they can't be bridged(no switch) like the 555's. :)
    JC approves....he told me so. (F-1 nut)
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  • unc2701
    unc2701 Posts: 3,587
    edited December 2005
    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
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  • heiney9
    heiney9 Posts: 25,221
    edited December 2005
    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
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • scubamike
    scubamike Posts: 60
    edited December 2005
    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.
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  • heiney9
    heiney9 Posts: 25,221
    edited December 2005
    scubamike wrote:
    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
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • RuSsMaN
    RuSsMaN Posts: 17,986
    edited December 2005
    RuSsMaN wrote:
    ......Try bi-amping with it.

    ....
    Check your lips at the door woman. Shake your hips like battleships. Yeah, all the white girls trip when I sing at Sunday service.
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  • heiney9
    heiney9 Posts: 25,221
    edited December 2005
    ............or you could bi-amp with the 545..........
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • scubamike
    scubamike Posts: 60
    edited December 2005
    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
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