Question about Audiovox AXT-550 Car Audio Amplifier

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I need a manual for a MTX audio terminator TNA251 amplifier so i can under stand how to use the buttens and so i can wire it right

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I bought a mtx terminator amp model no TNA251 600 watt and two subs installed. It works good for few days but now its not cranking up proper bass and sound. It always has three solid red lights everytime....


does it do this all the time when you turn it on? any sound at all?
provide more information, but my guess its that the amp is blown. replace it or sell it for parts.

Nov 11, 2013 | Car Audio & Video

2 Answers

MTX tna251


I have the same sub combo. The problem is the amp is underpowered for the 2 MTX 12s, get a bigger amp and you should be fine.

Nov 13, 2011 | MTX Car Audio & Video

1 Answer

What is the HLI port on the MTX tna251 amplifier?


What is the HLI port on the MTX tna251 amplifier?

Jul 15, 2011 | Car Audio & Video

1 Answer

I just replaced my old terminator 12" subs with two new 12" jl audio w3 4ohm subs and the mtx terminator amp keeps shutting off and flashing red. I kept everthing the same from my original mtx...


You may have touching speaker leads going into the amp. Make sure the tinsel is not touching across the speaker inputs on the amp. Also check your ground. It should be solidly connected to the vehicle chassis in a paint-free location. Finally, make sure there are no exposed speaker wires touching the vehicle chassis.

Mar 09, 2011 | MTX Terminator TN400/4 Car Audio Amplifier

1 Answer

I own a mtx 1501d.Also own a 18


THE AMPLIFIER NEEDS A 1 OHM LOAD AND YOU HAVE THE RIGHT SPEAKER TO PROVIDE THIS LOAD. THE AMPLIFIERS TERMINAL STRIP PROVIDES YOU WITH 2 POSITIVES AND 2 NEGATIVES, BUT THEY ARE ONLY FOR CONVENIENCE WHEN WIRING 2 DRIVERS. ACTUALLY THE 2 POSITIVES ARE THE SAME CONNECTION INTERNALLY ON THE BOARD, AS WELL AS THE 2 NEGATIVES. THAT BEING SAID, THE SIMPLEST WAY TO CONNECT YOUR SPEAKER IS TO PARALLEL THE VOICECOILS IN THE BOX BY CONNECTING THE 2 POS. TOGETHER AND THE 2 NEG. TOGETHER THEN RUN THAT POS. AND NEG. OUT OF THE BOX AND SIMPLY CHOOSE EITHER OF THE 2 POS AND NEG. OF YOUR CHOICE AT THE AMP. IF YOU EVER HAVE TO ADD A SUB, THEN YOU WILL HAVE 2 MORE TERMINAL LEFT OVER ON THE AMP. TO CONNECT IT TO AT THAT TIME. BY ALL MEANS, IF YOU WOULD LIKE TO RUN EACH COIL SEPARATELY OUT OF THE BOX AND CONNECT THEM TO ALL 4 TERMINALS, THEN THIS IS FINE TOO, AS EITHER WAY, THERE WILL BE NO DIFFERENCE WHATSOEVER. LET ME KNOW IF I CAN BE OF FURTHER ASSISTANCE....V

Nov 24, 2009 | MTX Thunder 1501D Car Audio Amplifier

1 Answer

Everything works fine but my amp light is red.


if its not coming on it usually means you have a bad ground if it works for a little while then does it then its over heating and you will need to get a fan

May 01, 2009 | MTX Terminator TN400/4 Car Audio Amplifier

1 Answer

Need a replacement ground terminal


when you do find a replacement use Kapton tape to reduce the heat on the parts use around component and around surrounding area except the place to be soldered

Apr 18, 2009 | MTX Thunder 81000D Car Audio Amplifier

1 Answer

Need proper wiring details.


This is a dual 4 ohm sub. By wiring the terminals in series (one set of + to - from one side to the other) you will have an 8 ohm sub (most folks probably don't want this). By wiring in parallel (+ to + and - to - and connect the - wire to the - terminal on your amp and the + wire to the + terminal on your amp you'll have a 2 ohm sub.

Mar 12, 2009 | MTX TA4501 Thunder 4501 MonoBlock Car...

1 Answer

MTX 1501 D


If the terminals were smoking, it's probably due to loose screws in the terminal block or wire that's too small.

Did the amp work properly after the terminal blocks smoked?

Apr 29, 2008 | MTX Thunder 1501D Car Audio Amplifier

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