Question about MTX Thunder 1501D Car Audio Amplifier

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1501d When i say "only feel current running through woofers", i mean w/ all three controls- freqency, EQ, and gain- turned all the way down, it produces no sound like normal, but when you place your hands on the woofers, you feel very slight tension proving they are hooked up. When you keep the EQ and freq. controls all the way down and turn up the gain, it Barely makes a difference. When you turn up either the freq. or EQ, or both, it produces more sound, but hardly any. At that point, you can turn the gain up and down, but doesn't show any real power. Amp isn't producing any power w/ all three down, and gain isn't giving hardly any GAIN ... what is wrong ... what is your opinion of what i should do. MTX doesn't fix this model anymore ...

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  • campbell84 May 09, 2008

    Yes, the woofer moves in and out in relation to the gain ....but the woofer does nothing when the gain is all the way down. This amp should still at least show some power when even all the way down. You can only tell the difference in gain when the other controls are turned up halfway or higher.

  • campbell84 May 09, 2008

    Let me clarify again that when the woofers "move in/out" i mean when i turn the gain up and down, the music Does play louder through the woofers. It just never reaches full capacity, or even close. And the gain works when i have either the EQ or frequency turned up w/ it. I took this into the audio shop and had it bench tested and the reciept they gave me reads: "..gain control knob and frequency control knob appear to have short. Gain control fades in and out when adjusting gain on amp." Yes, i am willing to try any opinions of truly repairing this.

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  • Master
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Does the woofer move in and out in relation to the movement of the gain control?

Posted on May 09, 2008

  • Perry Babin May 09, 2008

    Some MTX anps will have absolutely no output with the gain at the minimum.

    If moviing the gain causes the woofer to move in/out, it sounds like the Voltage Controlled Amplifier (an integrated circuit) has failed.

    Do you want to try to repair it yourself?

  • Perry Babin May 09, 2008

    If the sound crackles/pops when you turn the controls, they may simply be dirty. If they crackle/pop when you push up/down on the shaft, it's VERY likely that the pots are damaged beyond repair/cleaning. The connections between the terminal leg and the resistive element/wiper trace get loose. It's not practical to try to repair them. 

    If the woofer moves in/out when the gain is turned one way and moves in the opposite direction when the gain is turned the other direction, the VCA is probably defective. Since I'm not there and can't see what's happening, you'll have to determine which problem you have.

    If you remove the cover, NEVER (repeat, NEVER) touch anything inside the amplifier when ANY of the 3 LEDs are lit. The amp stores a significant amount of energy and when ANY of the 3 LEDs are lit, it means that the capacitors are still charged.

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Lost...


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If you turn the gain up and down, does the woofer move in and out in direct relation to the rotation of the gain?

What do you mean by "you only feel current going through subs"?

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