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How to take a mtx terminator tna251 amp off protect mode

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Mtx tna251 amp has bass remote that has a light glowing but turn knob up and down and no difference like simply not working no difference in bass? Posible causes,


It is actually in the controller, if you turn the remote all the way down and press on the controller until the bass goes off, you will be able to turn the bass up and down with the remote, mine worked but stopped after a month, I tried adjusting the amp but then I noticed that if I wiggled the knob on the remote that it would work, I mashed mine until it worked again and velcroed it to my console sonibcan get it on and off easily.

Mar 03, 2015 | MTX Car Audio & Video

1 Answer

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 bought a MTX Terminator amp and the light is red when I turn it on, but it works. Red usually means protect mode but it works fine. Should the light be red or green?


all depends on that amp... if there was an issue it wouldnt work, and the light would be by a protect symbol... if its just red next to the power symbol i say no issue.

Feb 18, 2010 | Car Audio & Video

1 Answer

Yellow circuit protection light


Please see my tip HERE regarding Protection Mode for Car audio Amplifiers.

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Aug 18, 2009 | MTX (TC4004) Car Audio Amplifier

1 Answer

My light on my amp is red i think it is sopost to be green


that means that your amp is in protection mode, check all your wires and also the speaker configuration.

Jul 15, 2009 | MTX Terminator TN400/4 Car Audio Amplifier

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