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Amp on but no bass

I have a kenwood KAC-8101D amp and about 2 weeks ago the bass started to cut out but i though it was because i was using a conver box for the rca's so i found the deck i wanted and i installed it and it started doing the same thing excep now i dont have any bass at all before it would cut out for few seconds and come back but now nothing the power light is on and i rewired the subs from the box out and i wanted to know if my amp is toast because if it is im just going to get a new one because its under warantee. thanks in advance

Posted by Adam Daniele on

  • Adam Daniele
    Adam Daniele Dec 19, 2006

    thanks for the tip but what has me puzzled is that when the amp did cut back in the subs sounded fine no distortion thats y i dont think its a sub problem and the oter reason is because the power light is on for the amp thats why i dont think its a ground issue... any other suggestions would be greatly but im going to check the ground wire but i dont have a multimeter.. but when i get one i am suppost to set it to ohms correct .. if im wrong please let me know thanks alot

  • Adam Daniele
    Adam Daniele Dec 20, 2006

    Thanks for the tip but i checked the ground yesterday and it was good and its in a spot where it cant rust. and no the head lights dont dim when the bass hits.. but now the bass isent working at all its completely dead but the power light is still on that why im thinking i blew the channel but i wanna know how i can test it for sure because if it is the problem then i will just return the amp so thanks again



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1st make sure the speakers are not bad, check th eimpedance with a multimeter, the voice ciols should read 3.9 to 4.3 ohm's. if any of your subs are below this most likly the subs are bad. if they are ok make sure the ground for the amp is good. now the last thing is the amp. try another pair of speakers, even if it's smaller ones, just make sure they are 4 ohm speakers, keep the vol. very low during your test. if the other speakers do not work then have your amp serviced or replaced. good luck

Posted on Dec 19, 2006

  • Anonymous Dec 20, 2006

    if it's an intermittent ground problem, using an ohm meter will not help, just make sure the location you hooked up your ground wire has no rust around it. ( rust, even a little can cause intermittent problems). Does your headlight dim very low. when you get a lot of base. if so you could have an power supply problem in the car/truck. that little light on the amp may not go out, but if the B+/ positive voltage drops to low the amp will trun off & on again without the led on the amp going out.

  • Anonymous Dec 26, 2006

    remove the screws from the bottom of the amp, you should find a bank of transistors on each side. there will be small ones & bigger ones. the bigger ones are your audio o/p. using a digital multimeter, test to see if the pins of the bigger transistors are shorted. the transistors work in pairs & would have to be replaced as such.



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it sounds like the power wire might be grounding out somewhere that you dont know of it could be by the fuse link so I would say put electrical tape on any exposed wire on the fuse link first if that don't work try change the power wire.

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Audio section
Max Power Output (4 ohms, 1kHz)
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It should be better to use the Pioneer GM-7200M Amp with your subs.

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