Question about Car Amplifiers

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Amp trouble my amp goes into protect mode when the bass is loud. amp gain is less then half bass boost is turned all the way down. could it be the ground or the rca. my 4 channel amp is fine no matter how loud i play it it never shuts off. subs a wired for 2 ohms each they are 400 watt rms alpine type R this problem happened with another amp i had so iam kinda thinking it could be a wiring problem...

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  • russpellman Aug 01, 2008

    its a infinity 1600a not an over load i had it wired for 4ohms and it did the same.

  • russpellman Aug 02, 2008

    checked the remote and 12v yesterday it was dipping below 12v. but now its staying at about 13v and its still cuts off. yesterday i thought for sure that was it this but today iam not sure .. if i keep the volume lower i can get more bass but then the voices aren't loud enough. any more suggestions

  • russpellman Aug 04, 2008

    the protection light comes on

  • russpellman Aug 04, 2008

    i am a tech. i came here because i have never seen this problem before. i had a diferent amp in and it still does it . when i first turn the system on the protect light comes on then goes off the music plays before the bass comes in. With this amp and the other . the other was a directed 404. ill check it out alittle more today

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Your gunning your amp too hard, the electrical prostate is being overloaded and it cums

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The ohm load may be too low. What make/model amp is it?

Posted on Aug 01, 2008

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  • Perry Babin Aug 01, 2008

    Does it do it if you use only one speaker?

    The amplifier has low voltage protection (if it's like similar Infinity amplifiers). If the voltage isn't remaining at or above 12v, the amp could be shutting down from low voltage. If you see the voltage drop below 12v on a multimeter (connected across the B+ and ground terminals of the amplifier), the voltage is actually dropping significantly lower because multimeters are relatively slow to respond. If it shuts down more quickly with the engine off, this could be the problem.

    The problem is unlikely to be from a bad shield ground on the RCAs. That's more likely to cause the amp to oscillate or have excessive engine noise.


  • Perry Babin Aug 02, 2008

    When the amp shuts off, does the power light go off or does the protection light come on?




  • Perry Babin Aug 04, 2008

    If the wiring for the speakers isn't shorted to the body of the vehicle (under the corner of the box), I think the amp is defective (especially if it shuts down driving 4 ohms and the voltage isn't dipping below 12v). You'll have to have a technician check it out.

  • Perry Babin Aug 04, 2008

    If you can reproduce the problem on the bench, it should be easy to determine which of the protection circuits is being triggered. I have the service manual. Email me and I'll send it to you.

    babin_perry@yahoo.com


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Wire 1 sub to one channel and the other sub to the other channel.

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sounds like ur gains are set to high and is going into protect mode

also what ive seen happen before is the speakers (if mounted in metal shelf or door and arnt bolted down correctly can flex under bass notes and flex the speaker that much the termanls short onto the metal and amp hits protect mode
(rare but worth a look if you think u have elimanted most other things Had a dude come to me when i was working in sydney with this problem )

also could be things like clipping protection , overheat protection ,amp drawing to much current from the alternator

do your lights dim when you hit the bass notes ?

get back to me and im sure we could solve this problem

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