Question about MTX421D Car Audio Amplifier

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Blowing speakers when i power the amp on with no rca's in place and hook a speaker up it pushes the cone of the speaker all the way out as it frys the speaker.

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The amp has a problem either with bad component(s) OR with the design.

The amp is driving DC out into the speaker and LIKELY one side of the final stage is shorted.

Be very careful in TRUSTING it after repair. I would put a fuse in the SPEAKER lines to save the speakers.

Posted on Apr 30, 2010

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1 Answer

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Looks like the speaker is blown , or the wiring inside the speaker is broken. To test if the speaker is working, simply hook up the terminals to the ends of a AA, AAA or C battery. Speaker should make a noise, and the cone should push outwards ( or pull inwards, if the polarity of the battery is reversed). Also test the wires that are hooked to the amplifier with a speaker that you know is good working order, just to make sure that there is nothing wrong on the wiring, on that particular channel in the amp.

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You need to plug in the RCA and speakers you could blow the amp. The amp is sensing no Input and No output. I would unplug the amp wait around 30 seconds then install the rca and speakers THEN install amp to battery + cable. You should be ok.

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Disconnect the wire from the speaker and meter it out. check it for a dead short, the meter would read 1..... You can also check the action of the sub by pushing on the center lightly, moving the cone. If it's blown, it will not travel smoothly. If your meter reads ......1 then you've really done it and totally cooked the wire clean thru, thus no resistance. Hope this helps.

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I just bot Pioneer speaker CH26861...4 wires to 2 leads...


I would tie both + from the speakers to the radio, and both - as well. This will give an equal amount of power to both speakers and reduce the chance of blowing a speaker. As for +&- on the speakers, It is usually marked on the black piece right by the terminals. As little power as you are putting to the speakers, it doesn't really matter which way you hook them up, as long as they are both hooked up the same.

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1 Answer

When i connect my power wire to battery my deck cuts off and when i disconnect cd player works


This is your receiver going into speaker protection mode. this could be one of a couple of things based on what you have stated. The obvious would be that your amp is pushing too much power for your speakers. You can try a couple of things. 1st is check your watts for your amp and speakers and adjust your gain accordingly(may need to adjust how much your putting out). If it is turning off with the gain turned all the way down, then that's not the problem. Try disconnecting the RCA cables, then hook up to the battery and see if your amp comes on. If it does, you have everything hooked up right for the most part. Doing this will make sure your getting power to your amp.

If you get power with the RCA jacks unplugged, you might make sure that whatever speakers are hooked up to the amp are disconnected from the factory wiring. Those are some things to check based on what you wrote.. Could you be a little more specific with things like what kind of speakers and deck you have, how many speakers you are running, describe what happens when everything cuts off, etc.

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This one Wire should be for the +. Try connecting the + to the Head Unit and - to a Common Ground. At the Worst, You will Blow the Amp Fuse if not Correct. The Lead from the Head Unit is Only an Off and On from the Ignition. Please Rate My Response! Thanks!

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1 Answer

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Connect each speaker coil one at a time to a square 9 volt battery and watch for the cone to move.

Also try hooking another speaker to your amp just to make sure it isn't in the amp.

You can use a 9 volt battery to test wire polarity also. Hook up the + wire of the speaker to the + terminal of the battery and the - speaker to the - battery terminal. If the speaker moved UP or OUT then the wiring is correct. If it moved IN or DOWN then the + and - wires are backwards on the speaker.

Also if you have two or more speakers hooked together test all the same way while they are hooked to each other. ALL of the speakers need to move in the same direction at the same time.

Clipping causes more speaker damage than anything. "Dirty Power" can happen in good quality amps too. The gain control is to match the voltage between the headunit and the amp. It is NOT a volume or boost knob. If you overdrive the first stage of the amp and then clip it damage will occur to the amp and speakers at some point.

Hope this helps.

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