Question about US Acoustics USX-4065 Car Audio Amplifier

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I have 4 infinity kappa speakers running off this amp. Can u give me the best settings for this amp.(from left to right) #1 - low pass between 40-200 ? #2-(for channels 3+4) level,mode, & highpass. Then repeat 3 settings for channels 1+2. Then selector in 3+4, 1+2, or low. The 2 rca plugs for back go in Line Out L & R, Inputs 3+4, or Inputs 1+2 ?This amp was hooked up and got unpluged and changed and need correct settings for 4-channel use again.

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I have a kicker zx350.4 for door speakers and the amp keeps cutting off once the bass hits hard or i have it aloud , once i put the volume down or bass low it comes back to normal and amp doesnt get hot at...


kappas are 2ohm. You are running that amp at 2ohms stereo on front and rear channels. That is a nice amp, but it is a thirsty one. If you have a sub amp as well, then you are not supplying your amps with enough power. drop down to 0 gauge and see if it heats up anymore. Also, try going high pass if you have subs. If you don't have subs. You need to run 4 gauge and make sure you have a great ground.

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What may of happened if that you got the lacquer finish on the electromagnetic wire to heat up and come apart. At low volume they will still have an electric connection. Because the wire physically came off from the inner housing of the voice coil it is in contact with the side wall of the speaker magnet and is proned to causing a short between coil sets. Your probably running subs with a 4 ohm impedance and when your coils short it acts more like a 2 or 1 ohm speaker. This is similar to whats called a dead short. Since the Independence is dropped to 2 or 1 ohm it is the resistance equivalent of having 2 or 4 subs attached to your amplifier which caused the final transistor bridge to heat up and it can get hot almost instantly. Check your amps outputs individually on a single speaker that you know works perfectly. If your amp does not trip the thermal protection you most likely cooked a speaker beyond usable condition.

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2 Answers

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You amp watt should be equal or higher then your speakers total amps.
You base box should be completely air tight, and have about 1/2 of the box stuffed with cotton.
Make sure you use a good thick speaker cables to connect from the amp to the speakers.
and finally, make sure your trunk seals tight and wont rattle... cause nothing sounds worse then someone pulling next to you and all you hear is a buzzing sound from the trunk rattling... Also... sell the infinity's and get something like memphis, or panasonics. :P

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1 Answer

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1 Answer

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If you can give me more info should be able to help ,what rms wattage is the amp and speaker is it a subwoofer or pair of speakers.

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1 Answer

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