Question about Kenwood KAC-859 Car Audio Amplifier

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Power, but no sound

The power comes on . .but there is no sound coming out of the subs. It was working before, although i think i must have bridged it wrong or something . .because it stopped working . .the power light was going off, then on, then off, . . . .so i disconnected all the wires . . tried it again . .but the power now works . but still no sound. .i'm starting to think maybe it could be internal problem . maybe one of the mosfets, or something . .

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Re: Power, but no sound

You may be correct. I would suggest that you get a schematic from the manufacture, and then using a voltmeter begin to test the test points of the final audio amp stage for bad voltage levels.

Posted on Sep 08, 2007

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I have an alpine mrv-f307 4/3/2 channel. I have it hooked up to 2 12in Kenwood subs. Right now standard 2 channel each sub having their own. I heard doing a series hook up and bridging the subs to the amp ...

Bridging an amplifier refers to combining the power of two channels to run one speaker at higher power. If it is wired correctly, your amplifier is running with 4 channels bridged into 2 speakers now.

Mar 11, 2015 | Kenwood Car Amplifiers

1 Answer

My amp and subs work but the subs dont sound very loud. how do i adjust my Pyle PLA4340 amp and fix this problem

Hello polarisracin,

You need to bridge 2 of the amp channels to each 4 ohm sub to get the most power from the amp. Bridge channels 1/2 to one of the subs and channels 3/4 to the other one. But the amp is only rated for 75 watts RMS per channel and Pyle products are sometimes rated higher than their real capabilities. So, even bridged and with the rated output, you'll only be getting at most 150 watts from a pair of bridged channels. That's not much for a sub.

Hope this helps.

Oct 01, 2009 | Pyle PLA4340 Car Audio Amplifier

2 Answers

Protection light comes on

Disconnect all speaker connections and rca cables. Leave power, ground and remote wires intact. Try turning on again. If you still have a protection light your amp is faulty. Hopefully you have warranty. Dou .A thumbs up would be greatly appreciated if this answer is helpful to you. protection-light-comes-lv2kkrmxrai4iihdvw4m3np2-2-0.jpg

Jun 14, 2009 | Nitro BMW-482 Car Audio Amplifier

2 Answers

Amp or something cutting out.

Power caps store power from the battery and they feed constant power to the amp so you dont get no drainage! this could be one reason..

have you bridged both subs and wat gauge wire are you using.

these amps can only handle one bridged sub at 4ohms and this amp is recommended that u use 8gauge or higher. if your running to subs i normally reccomend using 4 gauge power wire as you get more rms power feed to the amp

you can get a power cap or anyother accersory cheap online at my suppliers.. caraudiosecurity << click to enter >> hope this helps and please rate me :)

Apr 22, 2009 | Rockford Fosgate Punch 401S Car Audio...

1 Answer

Boss BA-2900 car amp doesnt produce any sound

i have come across a similar problem before. if you are using the ceramic (glass, clear) fuses the solder in the end caps sometimes melts. you will not see the fuse blown, but the fuse may still be bad. try a new fuse to see if that works. also make sure no single stray strands of wire from a positive or negative wire are touching on the terminals on the amp. i hope this helps. ill keep thinking of other things in the meantime

Jan 05, 2009 | Boss Car Amplifiers

1 Answer

Left speaker channel not working

you may have to send it in or back to the company... being that its one side it could be a blown amp or perhaps a bad speaker on that side ..

hooking up two 6x9s and a sub in bridge mode you could have a wiring problem when i bridge an amp i go from positive of one side and negitive on the other to the same positive and negitive on the sub or box

` bridge =========== > SUB
- --------------------/

hope this helps

Dec 25, 2008 | JBL GTO75.4 Car Audio Amplifier

1 Answer

Sub size

The sub you want is ONE single 4 ohm voice coil sub that is no higher than 500 watts in power but more than 350 watts. Your amplifier puts out the most power in the bridged state at 4 ohms so this is why you want a single 4 ohm voice coil sub. Also, you don't want to over or under power a sub so you want your sub to match or come close to your rated value of the amp. Good luck
-Andrew Hawkins

Sep 25, 2008 | Sony XM-1252GTR Car Audio Amplifier

2 Answers


Have you checked the on-board fuses?

Did you confirm (with a multimeter) that you have voltage on the B+ and remote terminals of the amplifier?

Did you have the black meter lead on the ground terminal of the amp when you checked the voltage?

Jul 18, 2008 | Sony Xplod XM-554ZR Car Audio Amplifier

1 Answer

Pioneer amp and sub problems

That's a 4-channel amp, not a 2-channel, which makes me wonder exactly how you have it hooked up to your sub. Is the LED light on the amp coming on? How many subs do you have hooked up to it, and how is it wired?

Mar 04, 2007 | Pioneer GM-6200F Car Audio Amplifier

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