Question about Clarion APX1300 Subwoofer Mono Amp - 300W Class AB 400W @ 2 Ohms Bass Extender Circuit Car Audio Amplifier

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Amp shut off and wont power mtx 12's blue power light is on the speakers wont do anything. the speakers worked for about 6 sec then stopped

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The transistor that mount to the amps body (heat sink) inside. most common issue with these.

Posted on Feb 04, 2010

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1 Answer

Mtx jackhammer jh300


Try another set of speakers to see if that works. If so, it could be your subs. Also, check ohm reading on each sub.

May 13, 2014 | Car Audio & Video

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How to i find out whats wrong with my bazooka tube i tried to hook it up to a car battery and car stereo out side but wont work ???


follow this steps and fix it. GOd bless you

  • Verify that the amplifier is turning on by looking to see that it is lit up.

  • 2
    Use a voltmeter to verify your power supply is a good 12 volts by touching the ground lead to you amplifier's ground screw and the positive one to the amplifier's constant power supply screw. Also verify that you have 12 volts coming from the remote lead wire which is usually a thin blue wire between the ground and constant 12 volt supply.

  • 3
    Look for the "thermal overload" light. It is usually a red LED on the side of the amp. If the amp feels really warm and this light is lit, the amp has probably overheated from being tuned wrong or turned up too loud and shut itself down to cool off.

  • 4
    Check the fuses on the amplifier. These can blow with extended use or during heavy bursts of use.

  • 5
    Make sure the "Gain" and other volume controls are turned up.

  • 6
    Confirm that the signal wire is still attached to the amplifier and has not come disconnected by vibrations in the car. Also check that the wires running out of the amp to the speakers are still attached to the amp.

Oct 27, 2013 | Car Audio & Video

1 Answer

I have 2 different subs in one box, a 12" MTX thunder and a 12" Kicker CVR. the kicker is a dual voice coil while the MTX I dont believe is. Can I use one amp for this set up? And how would it be wired?


im guessing both speakers are 4 ohms ..mtx 4ohms and kicker dual 4ohms..now if your amp can go down to 1 ohm wiring the kicker dual coils in parallel (2ohms) and the mtx connected together (4ohms) should leave you with a final impedance between 1 and 2 ohms ...i suggest you use one or get another

Oct 08, 2013 | MTX Car Audio & Video

1 Answer

I just bought 2 12 inch mtx thunder tc512 to replace my old school mtx blue thunders, everything worked great, but when i hooked up the new 12s i get nothing, zero, zip, nadda, there is nothing wrong


use a d cell battery and touch + of speaker to + of battery and hold it by doin the same with the -'s too if move they work if not there junk

Sep 09, 2012 | MTX Car Audio & Video

1 Answer

Can I use 8 gauge wire for my mtx rfl600


  • No, this is far to powerful of an amp to use 8 gauge. Use 4 gauge copper stranded wire. Using stranded copper wire is best for performance. I recommend a 100amp fuse being ran inline no more than 6 inches off the positive battery terminal as well.
  • You can use a 6 gauge copper stranded wire one one condition and that is if you use only a 4 Ohm speaker. Anything above that you need to go up to 4 gauge.

Regards, Tony

May 23, 2011 | MTX RFL600D Car Amp

1 Answer

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

1 Answer

No sound from speakers, but there is power to amp


make sure the power wire and the remote wire have voltage. at least 12 volts. make sure the ground wire is good and has a good solid ground. after that make sure the rca cables are getting signal from the radio. if you have a small speaker or tweeter you can touch the wires from the speaker to the rca cables and it should play music very quietly. meter the subs and make sure theyre ok and not shorted or bad. if all that checks out good.... the amp is probably bad. start with all the simple stuff and work youre way up. if the amp has good power and signal and good speakers then the only thing thats left is the amp. good luck

Dec 29, 2009 | MTX X702 Car Amp

1 Answer

No LED power lights go on


the light with the power light(middle) is a blue/purple faint light try checking it out at night.The squiggy(as heat waves) will only light when the amps shuts down due to thermal protection(wait for it to cool). The bolt/yellow (short circuit) will light when there is an electrical overload in any of the wires(check +ve leads).

May 26, 2009 | MTX JackHammer JH202 Car Audio Amplifier

1 Answer

Sub problem


have u tried bridging the speaker wires. amp could be gone?

May 19, 2008 | 2002 Pontiac Grand Prix

2 Answers

Whats wrong??


you should check the remote wire bc you will get power to your amps if its not hooked up but you wont get any music!

Aug 22, 2007 | Bazooka ELA300.1 Car Audio Amplifier

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