Question about MTX Thunder 1501D Car Audio Amplifier

2 Answers

Mtx 1501d ok im getting 5.6 ohm r249 5.3 ohm r247 5.3 ohm r245 39.2 ohm on r259 i dint replace any risistors i replace the 4 caps and 9 power transistors from fet248 to fet260. do you know what will cause a amp to send the dc current to the speakers? would this be because of a short if so what area do i look in. thanks

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  • naldo hoyte
    naldo hoyte Apr 18, 2008

    ok do you want me to do this with power to the amp or you want me to power it up for a couple second and the disconnect it and test each one with while the caps are charged. and another thing i never connected it with the amp open up and the led in the center of the caps light up led399. also up front at the rca conection ports i smelt heat like something was getting to hot

  • naldo hoyte
    naldo hoyte Apr 18, 2008

    i connect it again and the transformer was making this bizzing sound and the the led 238 flash and then went dim and the heated area started to smell again

  • naldo hoyte
    naldo hoyte Apr 18, 2008

    this is the pic of the amp

  • crxblue123 Mar 10, 2009

    when i power my amp up with the subs hooked up it pushes them out and makes a buzzing noise how do i fix it



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I have a mtx 1501d amplifacor stopped working the problem I have isthat on a led238 I want to know if it is blocked

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There are a lot of problems that can cause the amp to apply DC to the speaker terminals.

Before we go any farther, you should know that this amp stores enough energy to kill. When power is applied, the transistors must be clamped to the sink. After removing power, you MUST wait for ALL LEDs to go COMPLETELY out.

You need to CAREFULLY measure the DC voltage from leg 1 to leg 3 of all of the output transistors (the ones you changed). Post a list of the voltages and circuit board designation (FETxyz) for any that read more than 1v.

Do NOT let the probes short to other pins or to the heatsink when measuring the voltage.

Remember... High voltage and lots of stored energy. Be careful.

Posted on Apr 17, 2008

  • Perry Babin Apr 18, 2008

    I can't read the notes on the photo. Email me a full sized version:



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1 Answer

I need to know what ohm level my 1501 d class mtx thunde is?

Connecting a single speaker, speaker impednce should be equal to or greater than 1 ohm. Connecting 2 speakers, each speaker's impedance should be equal to or greater than 2 ohm

Dec 19, 2010 | MTX Thunder 1501D Car Audio Amplifier

1 Answer

1501d,, What subs should i use/

I would stick with Kicker or MTX. The best place in my mind to get them is
Just try to mach the specs as close as possible. Make sure to look at the recommendations of the subs for the size of the box and the port volume.

Oct 11, 2009 | MTX Thunder 1501D Car Audio Amplifier

1 Answer

Ran it at 1@ now it has low power

Hello if your amp is the one above in the picture, MTX-1501D then your amp is not 1 ohm stable. Your amp is rated at 500 watts x 1 at 4 ohms and 1000 watts x 1 at 2 ohms. The amp has a safety circuit that if it senses to low of a load, ohms, it will only put out half it's power to protect the amp from shorting out. Read the manual. You can download it at or just google it and a manual download site will be in the search list. Hope this hels, Good luck.

Btw, I’m available to help over the phone in case u need at

Aug 21, 2009 | MTX Thunder 1501D Car Audio Amplifier

1 Answer

I have a mtx thunder 1501d..i have the power cord connected from the battery, to a power cap and then to the amp...i have the ground connected to the metal frame of the car, to a power cap and then to the...

Hello tonytone54, The ground should go directly to the vehicle frame, never through a cap, fuse, or anything else. Also, if you are connecting positive through a cap, make sure that you charge the cap before connecting it. Hope this helps.

Jun 03, 2009 | MTX Thunder 1501D Car Audio Amplifier

3 Answers

1 ohm stable?

YES IT IS i have the same amp and i have it to 1 ohm its powering to kicker l7's which are 2ohm subs down to 1 ohm stability

May 16, 2009 | MTX Thunder 1501D Car Audio Amplifier

2 Answers

I don't know how many watts is this amp

ECLIPSE makes a 32440

If this is the amplifier you are looking for specs on...

4 x 85W @ 4 ohms (13.8V - 0.1% THD)
4 x 120W @ 2 ohms (13.8V - 0.1% THD)
2 x 240W @ 4 ohms bridge (13.8V)

Thanks for using FixYa -a FixYa rating is appreciated for taking the time to answer your Question.

Mar 28, 2009 | MTX Thunder 1501D Car Audio Amplifier

2 Answers

Mtx thunder 1501d

yes you can not run amps with your speakers being grounded un ground and then try

Nov 26, 2008 | MTX Thunder 1501D Car Audio Amplifier

1 Answer

Mta 1501d

You need to switch your meter to ohms and measure the resistance across them. You should read something near 4.75 ohms.

4.75 ohms would cause a constant tone on diode check or continuity.

Did you replace all 8 output transistors?

If not, are you sure that the other 4 transistors haven't failed?

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

1 Answer

Blown 1501d

R435 is 39.2 ohms. If R436 is the other gate resistor, it's also 39.2 ohms.

Oct 18, 2007 | MTX Thunder 1501D Car Audio Amplifier

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