I think I've done every thing, I've change the wiring from 8ga to 4ga, I put a cap on the line to stablize the power supply but the amp will still shut down after a while. I'm running one mtx 7500 12" at 4ohms the recommend power is 400 watts, with this amp I'm pushing 500 watts to it would that cause a short in the speaker? the amp is not that warm when it goes into protection.
I run one sub on my Kenwood Amp also. It does over heat also. My conclusion is that we are both trying to push that one sub too hard and the amp is having to work really hard to make that sub do what we are asking. Also, not having enough power or a good ground will cause it to over heat. I am going to go with the voice coils are heating up though.
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4Ga wire should be plenty for your application. If you're concerned - run (2) lengths of 4Ga - its cheaper than 0. A battery only extends the playing time of your system with the vehicle off. Your car runs off alternator power - and it is recommended you upgrade the alternator to a High capacity one to properly supply voltage to your amplifier. A capacitor is a cheap bandaid that will prolong the life of your stock alternator - but eventually - the alternator will die from the lage demands placed on it. Put the battery and cap money toward a High Output alternator.
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8ga will be fine with the amp listed, but if you plan on upgrading in the future, then go ahead, and buy the bigger wire. 4ga +. See at the time of purchase there is only about $20 difference between 8ga, and 4ga kits, but if you go with the smaller wire for now, and then upgrade later on, you end up paying double for yopur wire, and double for your install (if you arent doing it yourself).
go with an 8GA wire and see what that does for you because the battery is sending power to an amp but the amp cannot transfer all of that power anywhere without speakers being ran to it if you think 8GA is to small then try running a fuse in with your 4GA
I solved this by changing where the power for the DSP unit was coming from the manual specifys to connect them to the same +12 connector for display and DSP and it worked fine in the Series 1 however for some reason in the series 2 the DSP unit draws too much power from the headunit +12 power connector and as soon as the unit fires bass in a song etc it drags it down to the point of the display shutting off, I change the +12 on the DSP unit to my 4GA +12 power cable through an adaptor block and it has worked fine since.
try just hooking up a power wire and ground wire only. disconnect your subs from your amp along with the remote wire and RCA's. if you have some jumper wires or run a wire from the power terminal to the remote wire. YOUR amp should come on, if it still stay's in protection mode it might be shot... hope this was helpful, i couldn get my a2300hcx to come on and tryed this and it came on turns out it was my remote wire was bad of the head unit...