Question about Kenwood KAC-8401 Car Audio Amplifier

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Works perfect but then turns off

Every time i turn my stereo on the amp turns on perfectly but then the amp turns off and when i checked the amp it the red light turned on

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Be sure to have a good ground. If that is not the problem it could be the speaker or sub are hooked up to pull a certain ohm off amp and the amp is not rated to run at that ohm it will cause the amp to go into protect mode. Check how many ohms your speakers and amp are rated. Rewire speakers to specs.

Posted on Dec 04, 2008

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Kicker dx 250.1 class d monoblock amp has a fixed lpf at 80 hz 24db octave non adjustable. My car stereo is a pioneer deh-x55hd with the sub control set at 100 hz -6 slope unable to turn sub control off to...


Do you have the subwoofer amp connected to the pioneer thru pre amp connections; pre amp output of pioneer to pre amp input of Kicker amp. Page 10 of the manual explains how to adjust the subwoofer output. You can select the cutoff freq. that will pass to the subwoofer; The slopes don't match perfectly, but if you use the -12 slope , it should work fine.
Cut-off frequency:
50HZ
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80HZ same as kicker cut in freq
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100HZ
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125HZ
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160HZ
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200HZ
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http://www.pioneerelectronics.com/StaticFiles/Manuals/Car/DEH-X5500HD_OwnersManual112712.pdf

May 19, 2014 | Car Amplifiers

2 Answers

My Alpine MRP-M650 Amp is acting up. When I start the car, if the volume is at low, the subs don't work. But when I turn up the volume, they eventually kick in, then I can lower the volume. But when...


There are a lot of things that could cause this issue ...
1. Your amp requires more power than it gets when you start your car, and needs to charge up before it can work. If this is the case, you should be able to give your stereo about 5 minutes to warm up at low volume and it should come on. This happens a lot with amps with built-in capacitors (capacitors give you stunning, instant kick when working, but require a bunch of power to initialize). If you wire a bypass switch for the power to your amp and bass components, you can turn it on separate from the rest of the car and allow it to charge before you start your car (just be careful to turn it off when you are going to be away from your car for a while since this will allow your system to drain your battery).
2. Your amp might be set incorrectly for handling the system you are running. If your Ohms do not match up exactly (8 ohm speakers with a 4 ohm amp -- it's the "Impedance rating") then the system should not work at all, or should burn out the amp ... but with a jury-rigged system it can work. If this is the case, I recommend getting a new amp that matches your speakers.
3. Depending on the amp, there might be a volume-based cutoff that is working improperly. Turn on the car with the stereo at low volume. While the speakers are still not working, check to make sure that the amp has power, and seems to be functioning correctly. If everything seems like it's on the up and up, but the speakers are not working, try changing the volume-filter options on your amp.
4. I put this last because it seems like you know what you are doing with the system setup, but it is possible that you have a bad connection between the speakers and the amp, or between the stereo and the amp. There could be a loose connection somewhere (either inside the amp, between the amp and the speakers at the jack, or between the stereo and the amp at the jack). If this were the case, everything would look perfect from a visual inspection, but there could be a tiny space, or corrosion in a connection. Turning the stereo up to a high volume could then bridge this short circuit, and the electric force could magnetize the connection shut, allowing you to then turn the stereo down with the working connection. The best-case scenario here would be an external wiring issue, where you can clean any corrosion off the connections with an eraser, and reconnect everything tightly fixing the problem. The worst case would be a short WITHIN the amp, which would have to be repaired by someone with a lot of time and a circuit tester -- in which case you might be better off trading the amp in for a new one.

May 26, 2011 | Alpine MRP-M650 Car Audio Amplifier

1 Answer

I have my amp hooked up perfectly, but why won't it work? is there a re-set or somthing? i checked fuses and everything


Unlike the stereo unit, amps doesn't have a reset button.

Check the fuse in your hood.
Check all wiring, especially the ground to chassis.
Check for voltages, remote turn on should have 12V to ground and power cable should have around 12 to 14 volts.

Sep 19, 2010 | Sony Xplod Car Audio Amplifier XM-DS1300P5...

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JL A1800 Amp Not Switching On?!?


did you test for power at the amp, you should have 12 volts when the deck is on at the amp on the power and pto terminals. Also check and maybe reground the amp

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Hello, The problem your having is in the power supply section. If you want it repaired I will repair it for you. I own my own business. I install car audio/video systems in cars, trucks,etc. I also do amplifire repair. I am the cheapest repair business you will find. If your interested send me an e-mail at skinnman33@gmail.com if you have'nt allready had it fixed. I'll repair it for $40 you pay shipping. I have a website if you wanna check out but it's not even close to being finished. I got rid of my old page and server and I'm just trying different backgrounds and layouts. I'm just upgrading everything cause we are moving to a bigger facility. Again let me know. Good luck

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Amplifier problem


try this it may help do you have a frend that you could swap amps with just to test (put your amp in a working system to check yor amp) as it could be a number of things it could be no out put from the head unit or a break in the rca cables or dare i say it but the amp could be blown it may even be speaker cable from amp to sub or the remote not working have fun !

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1 Answer

MRP-M450 puts out no sound to the subs


The amplifier may be overloaded, check to see if it can handle 4 OHM loads and 2 OHM loads. if it turns off at high volume the amp may be overloaded. if so try a 8 OHM load. if it still turns off it may be an internal problem.

Jan 07, 2008 | Alpine MRP-M650 Car Audio Amplifier

2 Answers

LIGHTS ON BUT NO BASS


Is the master/slave switch set to master? Have you tried feeding the signal into a different amp to make sure that there is signal reaching the amp?

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