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

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

1 Answer

Red light on Amplifier


if your amplifier has the internal Kicker card dealie "little computer card on the side that you can change out crossover settings and such," Turn off the vehicle, remove this device and make sure the contacts on the card are clean and free from black soot (showing a spark). clean the contacts with a pencil eraser or something hard but soft... and put the little card back in place, start the car again and see if that helps, I used to lose one speaker every once in a while with the same amp. I ended up replacing the module with a different one from my dealer and it worked fine (still does and it's been in my car 6 years). Check that little module. if this doesnt work, while the car is running and the music is "playing" wiggle the card and see if it works sometimes and not others. Likely is the little module.

Dec 28, 2006 | Kicker (ZX750.1) Car Audio Amplifier

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