Question about Car Amplifiers

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Amp problem Just got a 1600W 2 channel amp. Power Acustik power series, used.  When I first bench tested it, I got the red "protection" light, then it went away. So I installed it in the truck on 2 of my drivers, all wired in properly(been doin this awhile) It got the green power light and played fine... Moments later it quit playing, but was not hot and didn't blow a fuse. Also it was not being driven into clipping or even NEAR it.. I was still adjusting my crossover.. I think it is somewhere on the input side because if you play with the bass boost and crossover switches it clicks in the speaker just so slightly, like a functioning amp with no input.  So, anyone heard of this and is there a surefire test?

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4 Answers

Re: Amp problem

I have a 774 4 chanel amp performance teknique the red light go on wen i plug da amp in.

Posted on Oct 28, 2008

Re: Amp problem

Ok guest, one of the best, easiest, quality products out there for that type of project is made by Scosche, And is avail. at your local Wal Mart for around sixteen bucks. It's a small blue box with a set of RCA's and a set of screw-down wire terminals. It's really easy, locate the closet halfway point where you can access your factory speaker wiring, one left, one right, so long as both are on same "fade (ie: both front or rear) tap into those wires with a razor cut into the insulation abou ta half inch and wrap a new wire tightly around the factory one. Now you have "tapped" your L+R channels WITHOUT losing the use of those original speakers! Simply route your new wires to the terminals on the scosche unit and it provides adjustment of the voltage to the RCA's to either compensate a weak head unit, or protect the amp from a powerful input! read the instructions on tuning the unit and you'll have a great sounding "stealth" system in no time!

Posted on Dec 20, 2007

Re: Amp problem

Hey i bought a new headunit only to find out that there is no rca out i wanna set up subwoofer is it possible? thanks

Posted on Dec 19, 2007

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Re: Amp problem

I don't know of a surefire test, but i had an ov2-400 gothic amp that i bought used and it had the same issue, or at least very similar. first thing to do is hook it directly to a known good source, if that fails, use the high inputs.

the fix for mine was to disconnect the amp completely, open the case, and spray everything down heavily with CRC QD Electronic Cleaner, it costs about 5 bux at any autozone and is extremely handy. this fixed the issue, i then sprayed the connectors down with rid-ox and used an rca adapter as a cleaner (ie inserted it into each socket while wet and rotated it a few times), also installed a new set of rca cables just to be on the safe side.

in my case the amp was stored in a trunk and had something either spilled or condense in it, a good cleaning of the board took care of the problems and it has been working now for the past 4 months.

hope this helps,

Posted on Nov 15, 2007

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What is the speaker load in Ohms that you are running? Or what exactly is hooked up to it? are you bridging it? The protection light will come on if the load is too much for the amp to handel. If the load (in Ohms) is less than the rated load that it can run, it will stop the output to keep the amp from self destructing. The amp will sense that the demand for power will be too high for the amps circuitry which will either make the amp get so hot that it will burn up the copper on the board or more likely burn up the power mosfetts that power the speakers. If the Ohms are within range then it will allow power to flow through the circuit until the rails that the mosfetts are bound to until they get so hot that it will go into thermal protection. So if your amp has both thermal and overload protection lights and the overload is light then the load is probably too much for the amp. if it's bridged in mono the you can only have 1 speaker setup hooked up it if it's a 2 channel amp. a 4 channel amp bridged in mono for both front and rear channels will be able to have 2 speakers rated a 4 ohms each hooked up to the amp 1 set per bridged output or channel.
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