Question about MTX Thunder 421D Car Audio Amplifier

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Sub not working and red light on amp stays on?

I have two JL audio subs mounted in power wedge enclosure hooked up to a MTX thunder 4300x amp. One sub speaker has no sound and the amp has a red light that is always on?

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The amp is under to much pressure get a bigger 1

Posted on Nov 18, 2009

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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.

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