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  1. #1

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    Default ? About Bridging Amps & SDA's

    Ive heard its a no-no . But a friend of mine was asking why & i said i read it couldnt here on a older thread. So' if it could be done - how would it be set up ?
    RANDY
    ~SDA2b Adcom gfa555 565pre 555t 600cd Pioneer PLa35d
    ~SDA1c Denon POA2200 Yamaha RX-V1(gold) HK25 AT-LP120tt-HT 4/rs Cs400i/cc Premier Acoustic PA-150 subwoofer
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  2. #2

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    SDA signals are tough on amps because they resemble hooking amp channels together and that can be seen as a short circuit by the amp. This is worse when amps are totally separate pieces of gear.
    Last edited by Dennis Gardner; 02-28-2014 at 12:07 PM. Reason: clarification

  3. #3

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    Bridged amps are no longer common ground. Other thing is if you bridge an amp with a 8ohm speaker it sees 4 ohm, bridge and 4 ohm speaker now amp sees 2ohm.

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    Great answers. Thats sums it up quite well. We got into a long discussion & i just didnt know how to answer the question as to if it COULD be done in adding grounds or other tech processes above my knowledge. Thanks
    RANDY
    ~SDA2b Adcom gfa555 565pre 555t 600cd Pioneer PLa35d
    ~SDA1c Denon POA2200 Yamaha RX-V1(gold) HK25 AT-LP120tt-HT 4/rs Cs400i/cc Premier Acoustic PA-150 subwoofer
    ~Marantz 2252b 5025b 6300tt Tech-a4010s monitor 7b
    ~Yamaha cr2040 Advent2 Monitor 10a
    ~Rotel RV555 monitor 4 series 2 -office-
    ~Pioneer seQ404 2-4channel headphones

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    IF (big IF) the SDA is of the last two generations (pin/blade SDA cable--such as your SDA 2B or 1C) you can install an isolation transformer in the SDA interconnect (Polk AI-1, or aftermarket "Dreadnought" upgrade.) Once the isolation transformer is in place, you no longer have a need for an amp with common-ground between the channels. Bridged amps are fine.

    OLDER SDA speakers (blade/blade or previous connection) cannot use the isolation transformer, and are therefore NOT USABLE with any non-common-ground amps including bridged amps as long as the SDA interconnect is plugged in .

  6. #6

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    ^^^^ i have read that here - when people wanna use a certain amp Not Common Ground. So that makes sense. I myself would never need to do that,as room size is a factor. They sound great to me the way i have them now. He went with me to pick up my RX-V1 & we saw this guys set up & he questioned why i dont do that to get better power to the speakers. I will show him this thread
    RANDY
    ~SDA2b Adcom gfa555 565pre 555t 600cd Pioneer PLa35d
    ~SDA1c Denon POA2200 Yamaha RX-V1(gold) HK25 AT-LP120tt-HT 4/rs Cs400i/cc Premier Acoustic PA-150 subwoofer
    ~Marantz 2252b 5025b 6300tt Tech-a4010s monitor 7b
    ~Yamaha cr2040 Advent2 Monitor 10a
    ~Rotel RV555 monitor 4 series 2 -office-
    ~Pioneer seQ404 2-4channel headphones

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