Common ground amps

muncybob
muncybob Posts: 3,088
edited May 2011 in Electronics
Was not sure where to post this, so if mods feel it should be elsewhere feel free to move:

I wonder if I just made a mistake on an amp? I just purchased from a fellow Polkie the Rotel RB976 amp...reviews seemed decent and price was right for me at this time. I plan to initially use the avr zone 2 preout to power a pair of SDA 2B. Was looking to bridge the amp and just use 2 of the available 3 channels when bridged. Now I read that on some amps that are common ground...when you bridge them you lose the "common ground"??

Can I bridge this amp and not damage the 2B's with the interconnect cable attached? Is there a way to check the amp in bridged mode to determine it is indeed common ground?
Yep, my name really is Bob.
Parasound HCA1500A(indoor sound) and HCA1000(outdoor sound), Dynaco PAS4, Denon DP1200 w/Shure V15 Type V and Jico SAS stylus, Marantz UD7007, Polk L600, Rythmik L12 sub.
Post edited by muncybob on
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  • [Deleted User]
    [Deleted User] Posts: 7,658
    edited May 2011
    Hello,
    When an amplifier is used in a bridged mode it no longer can be used with a common ground speaker. You would potentially damage the amplifier if you used the SDA interconnect cable.
    Sorry, Ken
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  • muncybob
    muncybob Posts: 3,088
    edited May 2011
    OK, so for the time being I could use the SDA w/o the cable connected and not risk damage...just won't have the SDA effect?
    Yep, my name really is Bob.
    Parasound HCA1500A(indoor sound) and HCA1000(outdoor sound), Dynaco PAS4, Denon DP1200 w/Shure V15 Type V and Jico SAS stylus, Marantz UD7007, Polk L600, Rythmik L12 sub.
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  • F1nut
    F1nut Posts: 51,025
    edited May 2011
    Yes, but you'll lose more than just the SDA. Besides, bridging is hardly all that.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • muncybob
    muncybob Posts: 3,088
    edited May 2011
    So, overall quality will diminish....to the point that they will be un-enjoyable? Was looking to bridge for more power to drive the SDA's....6 channel mode is 60wpc, bridged is 150....I'm guessing that when you bridge you are supplying more current too? Maybe I've got this all wrong?
    Yep, my name really is Bob.
    Parasound HCA1500A(indoor sound) and HCA1000(outdoor sound), Dynaco PAS4, Denon DP1200 w/Shure V15 Type V and Jico SAS stylus, Marantz UD7007, Polk L600, Rythmik L12 sub.
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  • treitz3
    treitz3 Posts: 19,465
    edited May 2011
    Think the opposite of what your thoughts are. More watts, yes. Flabbier, less prominent bass is the end result and completely not worth it with the loss of SDA.
    ~ In search of accurate reproduction of music. Real sound is my reference and while perfection may not be attainable? If I chase it, I might just catch excellence. ~
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  • F1nut
    F1nut Posts: 51,025
    edited May 2011
    Right more watts, but less current.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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