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    Setting gain on bridged amplifier..

    Is there something special you need to do to set the gain on a bridged amp? I have a Profile AP1040 (4 channel) amp that I wanted to drive a set of rainbow comps off. Its 80x4 @ 4 ohms in its "normal" state. I bridged it and went to set the gains. According to profiles web site its 255w x 2 @ 4 ohms bridged. So on a 4 ohm load ...using the normal gain setting equation... I come up with a voltage of approximately 32 volts.

    When I set my head unit volume @ 3/4 I can only get about 18 volts at full gain on one of the channels. I didnt check the other channel...

    When I set the gains in normal 4 channel mode I didnt have any issues. Of course the voltage was only 18 volts then....

    any ideas? Is a 4 channel amp different? I was measing from the positive of one terminal (channel 1) to the negative of the other set of terminals on channel 2.



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    Re: Setting gain on bridged amplifier..

    You wouldn't measure the voltage of just one channel. You would measure at the terminals you would use to bridge the amplifier. So you take the (+) from one channel, and the (-) of the other channel and then measure the voltage.




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    kingsxman's Avatar
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    Re: Setting gain on bridged amplifier..

    That is what I did. I measure + from channel 1 to - on channel 2. So the leads are basically spanning 2 channels.

    I did just realize that I had my equalizer on......which could cause an issue. I would have thought I would have to turn the gains way DOWN for that kind of pwer.....but so far not the case....



    Car audio newbie:

    HU: Eclipse 8445
    Front stage: Rainbow CS230 Pro 5 1/4 components
    Rears: Alpine type R 6x9
    Sub: 2-10" JL Audio W6v2
    Front/rear power: JL Audio 300/4
    Sub power: JL Audio 500/1

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