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I have a kenwood kac not sure of the # year is 93 it keeps blowing fuses during power up goes to protect mode makes a hiss sound from the switch on device that usualy makes the hiss for only a short second..I tryed unwiring and powering still the same even alternative power sources..please help me by explaining what this might be..I also before this ran my left sub bakwards (neg n pos bakwards) I found this out because my bass was not powerful so I hooked it up right then the fuses blew n what I described started to happen ( there wasn't any problems until I hooked the wires properly up)

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You have a short circuit some where in you system. Trace your power wire from the fuse that always blown and you will find your problem. Goodluck.

Posted on Apr 26, 2008

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Ihave a keenwood kac 7252 amp that is running two mtx thunder 4500 12`s but amp fuse keeps blowing at higher volume why?


1.-check proper heat sink, or dissipation.
2.- check speaker impedance. Must match between amp and speakers.
3.-low power line on the house may cause low efficience work on the amp, overheat, and finally fuse protection.
4.- finally, check speaker wires. Thin cable overheat amp too.

Nov 23, 2014 | Kenwood Kac-7252 2-channel 1000watt Power...

1 Answer

Kenwood kac 628 red light comes on and no audio output


The red light you describe on your amp, is the protection mode warning light. An amp goes into protect for many reasons. Here's a checklist.

1st check the fuse (s) on your amp and make sure they are not blown.

2nd check the inline fuse next to your car battery (if you have an inline fuse)

3rd, disconnect the speaker wires with amp on, does the light go off?

4th check your ground, this may be ok if you have tried another amp with the same wires.

5th.if none of these turns the protect mode off, it may be an internal fault.

you may have blown transistors and it is a tricky job to repair and costly.

Jan 28, 2013 | Kenwood KAC-628 Car Audio Amplifier

1 Answer

My 1800 watt kenwood keeps goin into protect mode as soon as i turn it on.. why?


disconnect load (speakers), check if it still goes in to protection if so then your output stage might be faulty

Apr 17, 2010 | Kenwood KAC-9152D Car Audio Amplifier

1 Answer

My amp is a kenwood kac-9152d it goes in to protection mode soon as you hook up the power


In protection mode do you mean the light comes on and it plays music and stuff? If that's the case, that's what the amp is supposed to do. Protect itself from a power surge

Feb 21, 2010 | Kenwood KAC-9102D Car Audio Amplifier

1 Answer

I hooked up my kenwood amp and the power lite doesnt come on kac-6104D


That is because it is in protect mode. A lot of times this is because of a bad ground or the battery is not strong enough and you should give it a charge then try it again. But normally it is the ground and make sure the remote wire has a good connection.

Feb 21, 2010 | Kenwood KAC-6104D D Class Mono Power...

1 Answer

I have a kenwood kac-728s and two coustic 10in. subwoofers hooked to it and every time i start my car and the radio powers on the two 20 watt fuses on the amp blows.any ideas?


That is pretty much saying that the amp's power supply is shorted or at least has a low resistance path to ground which is causing the fuses on the amp to blow. The amp has protection circuitry to prevent damage to the output stage so that is not what is causing this. Is the amp new?

Dec 30, 2009 | Kenwood KAC-728S Car Audio Amplifier

3 Answers

My kac-910 keeps shuting off at high volumes after about ten minuets i have two 12s


loose ground? shortage? overheat? sounds to me personally that problem with subs or wire touching ground...so signaling for asmp to enter protect mode?

Jun 29, 2009 | Kenwood KAC-9152D Car Audio Amplifier

1 Answer

Kenwood amp kac-x401m


How long will the bass play before the amp kicks into protection mode and how loud are you listening to it? I've noticed with my amps that if they don't have enough air flow they will get hot and kick into protection mode. They will also kick into protection mode if you are running it at more than it can handle. Check your adjustments on both your amp and the head unit. Make sure you are not running more bass than the amp can handle.

Nov 04, 2008 | Kenwood KAC-9152D Car Audio Amplifier

1 Answer

Kenwood kac-7202


Nope it's not a high-to-low level converter problem, it's most likely a problem with one of two things. 1) either you've blown the output stage in the amplifier, or 2) you've hooked up your subs wrong and your amp is seeing to low of an impedance. The amp is supposed to be 1ohm stable, but we had the same problem. When the indicator light goes red it means that the amp has gone into protection mode, now you have to figure out why. If something in the amp goes bad or just disconnects from the board it will cause power protection mode. If you fry something on the board because you are running the amp to hard or at the wrong impedance it will go into thermal protection mode, however there's no simple way to figure out which has happened.

Have you tried hooking up some different subs to see if the problem remains? try this. If the problem no longer happens then you know it's your subs, if it does still happen then you'll know it's an internal problem.

Years ago I had a Kenwood KAC-821; long story short, I melted the main power wire right off of the board, everytime I turned the system up the amp would shut down.

Take you amp to an authorized dealer and have them bench test it for you.

Let me know what you find out.

Jul 14, 2008 | Kenwood KAC-7202 Car Audio Amplifier

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