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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

Posted on May 01, 2009

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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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It sounds like you have your gain to high. best way to solve this is by turning the gain way down to - or lowest number , then turn everything on and upto the volume you desire, then slowly up the gain. also avoid using bass boost, I agree it sounds great but it puts strain on the amp and shortens life in the amp. with the bass boost off, you can adjust others (not the gain) to get bass.

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1st have your subs facing inwards towards the front of the car, not facing out the boot, This creates a better bass.

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

Turn down your gain as low as possible and then power everything up.

turn volume to desired loudness and then start turning up the gain slowly, if distorts a little turn in back down a notch.

avoid using bass boost, I agree it sounds great but it puts more strain on your amp and shortens its life.

after sorting out your gain, tweak all others until sound is bassy and clear with no distortion.

If you would like to use bass boost, turn on bass boost first, then up your gain etc.

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If your head unit has an amp gain, turn it up as high as it will go. If it is hooked up to subs, the head unit will say subwoofer output in the menu. Then take a small screwdriver and turn the amp gain on the side of your amp counterclockwise to zero. Turn your freq. up to about a third. Crank your system up, with a song with good bass, and slowly turn your gain up till the bass from the subs sound distorted, and back it back down. If the bass is drowning out the other speakers in your car, then turn the gain down some more. I find it works best if you have your trebble up high, your mid range at a little less than half. And your bass at zero or one. Your amp is cranking up the bass, so let your other speakers handle the rest. This allows it to sound clearly at higher volumes.

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Could be that you have a partially roasted(blown) coil on one of your subs which will function- but will keep tripping your amp.You can check that out just by using a different set of subs to listen to and by the process of elimination if the problem goes away then you know where the problem is at.Also check your gains you might be riding the gain a little high which causes distortion which causes heat(FAST) which will cause the amp to shut down completely or some amps will decrease output in a programmed attempt to save itself.turn the bass boost down to half if you even use it at all- that too can cause massive distortion in the amp itself,meaning only that if you have the bass boost on your deck turned up and then you turn the boost up on your amp the sound signal is then WAYYY distorted which will cause a thermal shutdown too. Last thing is to make sure that your subs arent running below 2 ohms because i believe that particular amp is designed to put out about 900 watts at 2 ohms.good luck

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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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First of all you need to know your enclosure. If you have a ported enclosure tuned in the mid to low 30's you may want to set the low pass to around 70-80 hz with your sub sonic set at 30 hz. this will give you the higher bass frequency you need for the loud bass you want, and protect the sub from going too far below the tuned frequency of the enclosure, and losing it's composure.

As far as the gain, and bass boost are concerned, you just have to adjust them by ear. First adjust the radio volume to normal listening levels, by that I mean as loud as it can go without the speakers in the car sounding like ****. Now you adjust the gain first. slow turn the gain control, carefuly watching and listening to the sub.. Adjust the gain to the point of the woofer getting a lil sloppy then back it down a bit until the sound is clean again. Now do the same with the bass boost. if there is a bass boost frequency adjustment, set that as close to the tuned frequency of the box as you can.

If you are in a sealed box the adjustments are a bit easier, and are all about taste. Adjust the radio as described before, and put on your favorite song. Next start udjust thing lowpass frequency to taste, not too high tho, try not us higher than 100 hz in your sub's for better sound. Sub sonic is not quite as important in a sealed box, as there is much less danger of the sub losing control.

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Your Sony users manual is a little vague on how to best adjust the level and other controls.

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ADjust your Gain setting to limit just enough so the amp does not go into Protect mode. Turn your Gain all the way down, then crank up the bass from your system. GRadually turn up the gain until you trip on protect. Turn the gain back a notch and your set for no more protect.

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