Top 20 MTX Thunder 3401 Car Audio Amplifier Questions & Answers

You are def overheating, If the ohms rating of the subwoofer is too low it will cause this same thermal over heat. If you have 2ohms in sub and a 4 ohms stable amp, you will overheat. Check the ohms rating of the sub to make sure this is not the problem

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turn down music open sub box and put another speaker at wire and check again if work means sub is ok if not check the signal cable, and put there the speaker to try signal

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If the amp produces no boom with no signal input cables connected, I'd suggest using an LOC.

Let me know if you have any other questions.

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Kind of a vague problem description, can you be a little bit more specific. What problems you are experiencing, how many speakers/subs were you powering with it, does it show that it has power, did you check the fuses?

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Check the ohm measurement of the speakers make sure they are about the rated ohms.Check them UNHOOKED from the amp. (Useually 4 ohms.)

Try different subs.

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Try eBay Often available there from private sellers

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I was having a similar issue. I checked every wire from the battery to stereo to amp, checked the ground, pulled the stereo to double check the wiring was all correct. Everything seemed good so I thought it had to be my battery not putting out enough power. Tested it and it was good. What it turned out to be was the connection from the power cord to the battery. It had a tiny bit of built up corrosion that was making the amp go into protect mode. Cleaned it up and hooked it back up and has been golden since.
The link attached is pretty straight up on what you need to check for different circumstances. I'm guessing it's a low voltage issue. Good luck

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power to-battery plus



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you have to first note the ohm load the amp can handle and wire the speaker that ther amp can handle

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Check the wiring 1st then go down the line...Check speaker connections..Look at your power,ground and remote wire hook up

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Since this is a vintage item, the cost is whatever the market will bear, wherever you're trying to sell it. I would suggest checking current prices on sites such as eBay, where one is currently being offered to sell at $200, while another is being offered for $90. The perceived value is what determines the selling price at this point, because the MSRP is long irrelevant by now, being that it's a discontinued item.

If you need further help, I’m available over the phone at

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The mtx thunder is a 4 channel amp. 4 channels can't be bridged to 1 speaker. You can only use one side of that amp to bridge your speaker. Unfortunately your now only using half your amp.

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You have a short somewhere in the speaker wires.

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Take both positive leads to the positive of the amp. Both negatives from the sub to the negative of the amp. Utilize the bridged output connections. This would present a 3 ohm load which would be around 100 watts rms (rough estimate)

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250wrms is the highest they can take each. So look for an amp that does 500 wrms [email protected] 2 ohms or one that does 250wrms X2 @ 4ohms.

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If you wish to get some details; check the site linked here. Pull up older posts.

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Get a speakers to line input adapter and that will do the trick.

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