Question about Kenwood KAC-628 Car Audio Amplifier

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Power to amp none to sub

Indicator light on amp winks in time to music nothing to sub

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Re: power to amp none to sub

If you disconnect the speaker wires from the speaker output terminals of the amp, does the light still blink with the music?

Posted on Dec 20, 2007

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My mtx thunder 421d I just got has the red light staying on all the time, I have hooked up a rca converter and the amp wont play my sub, is that light supposed to be red all the time.

The LED should be red. If you are not getting power to the sub, make sure the speakers are connected properly to the amp. Also make sure that the gain control is turned up. If it is all the way down, you will not hear anything from the sub(s). If none of that works, it is possible that you have a blown sub. If you smell a burnt smell near the speaker magnet, there is damage to the voice coil in the sub.

Feb 25, 2011 | MTX Thunder 421D Car Audio Amplifier

2 Answers

My subs/amp are not working

when you car is running, it charges the battery somewhat. So the voltage problem is not a problem. The red light means the amp is going into ''Protect Mode". This usually happens when something is wrong with the amp. Usually the amp is getting hot. Check all of you connectiong and check the final impedance of the subs. Make sure the amp can handle the impedance of the subs. If you need anymore help, message me.

Feb 12, 2010 | Kenwood Excelon KAC-X621 Car Audio...

1 Answer

I have a rockford fosgate 501bd amp the protect light comes on when my deck turns on even with no speakers connected

un hook the subs and let the amp sit there on if the protect light shuts off you wired your subs wrong if it doesnt go off tun it off then back on with no sub music all the way down then slowly turn the music up if the light is off then comes on you need new rcas

May 03, 2009 | Rockford Fosgate Power 501BD Car Audio...

1 Answer


Overload maybe. If the amp is run at an improper impedence, the amp will shut down. If you are "CLIPPING" speakers / subwoofers the light will blink to indicate a hard clip . Example: 4ohm/2ohm stable amp with 4 ohm subs wired at 1 ohm.

Jan 28, 2009 | Infinity Reference 7541a Car Audio...

1 Answer

No boom in my box

Whats up!!! well check this out. The sub isnt working at all? don't hear anything from it? more then likely it can be one of the following problems.

before you do these steps make sure that the amp levels are all the way low so you dont have a chance in poping the sub for unnecessary jolts of power

you can check to see if the sub itself is good by getting a AA and touching each of the speaker +- on the sub see if you hear anything. More then likely the sub itself is good.
Moving on to the amp. Do you see any lights? red/green? or none

if no lights check the pos/neg terms and make sure there properly installed. have to check underneath the hood for that while your there check the fuse if its a inline one if not then there should be a fuse located on the amp itself.
if you see green then the amp is getting power and the amp is properly grounded
if nothing check the grounding and make sure thats its connected to the frame of the vehicle either by sanding down a small piece of the metal exposing the silver and using a self-tapping screw.

feel free to contact me via yahoo messenger if you have any questions
always forward-jcbproducts


Nov 16, 2008 | MTX Thunder 1501D Car Audio Amplifier

1 Answer

I think my ex blew my amp

model number? im thinking 401s? if so that should be the only light on

Aug 07, 2008 | Rockford Fosgate Punch P5002 Car Audio...

1 Answer

Car audio

hi, your amp seems to be getting power but the cables might be wrong so it's not getting enough power. the light on the amp should be green if everything is going well. are you sure the cables are suitable for your amp?

Sep 11, 2007 | MTX RT202 Car Audio Amplifier

1 Answer

My amp turns on then the music cuts in and out

check your main ground, if possible try to read voltage across making sure 12-14v present with load and some signal.

Aug 08, 2007 | Verge VGA285 Car Audio Amplifier

1 Answer

No power output from the amplifier...

The EEE and protect leds being on is a clear indication this AMP is toast.

Jun 24, 2007 | Ultimate Sound T3 Series 4600 Car Audio...

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