Question about MTX Thunder 421D Car Audio Amplifier

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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.

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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.

Posted on Mar 07, 2011

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Keep in mind that the seal on the bottom of the amp cannot be broken or that will void warranty coverage.
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800 225 5689 - MTX Customer Service & Amplifier Service Center
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