Question about MTX Thunder 81000D Car Audio Amplifier

1 Answer

Amp not working need repair

My 81000d amp lights up but was wired wrong to my hd2 punch speakers and blow only 1 of them and now no sound from the amp and the amp gets hot i really love that amp l want it fixed my name is kobey if you can fix it give me a call 770-616-6113 or email me @ thanks abunch!!!

Posted by on

1 Answer

Re: amp not working need repair

You should open the amp and check if you've popped a transistor. It could also be that you've blown a relay... which really sucks lol

Posted on Mar 01, 2008

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

MTX 81000D amp doesnt work

Have you checked to make sure your sub is wired correctly to the amplifier?

May 30, 2010 | MTX Thunder 81000D Car Audio Amplifier

1 Answer

Amplifier loads

Hello ronnieyannon,
A single 4 ohm speaker wired to each channel, like you have them wired, presents a 4 ohm load. And it appears that you have them connected properly. The 401s is only stable to 4 ohms when bridged, so if you were to parallel the 2 4 ohm subs in bridged mode, the load would be 2 ohms and the amp would most likely overheat and go into protection.

I'd wire them the way you have them wired.

Each channel of the amp outputs only 100 watts into 4 ohms. That is adequate for regular full-range speakers, component speakers, mid-range drivers, and even some small subs. But it is a little low on power for most subwoofer applications.

Hope this helps.

Apr 22, 2009 | Rockford Fosgate Punch 401S Car Audio...

2 Answers

Rockford fosgate punch 700s gets very hot

Disconnect the speaker wires from speaker terminals on the amp and turn the amp on (turn the head unit on). Set the volume to zero on the head unit.

Does the amp get hot?

If it does, either the bias is set to high or the amp has other problems. If it does not, you may have the speakers wired to the wrong ohm load.

Nov 03, 2008 | Rockford Fosgate Punch 700S Car Audio...

1 Answer

Something Wrong With my Fosgate 500-a2 Amp

Is the amp being fed directly from the head unit's RCA preamp outputs or is it being fed by another amp's preamp outputs? Try temporarily wiring up a speaker you know is good in place of the sub and see if anything changes.

Apr 01, 2008 | Rockford Fosgate Punch 500a2 Car Audio...

1 Answer

Absence of sound

If you have another amp in the vehicle, swap the RCAs and speakers to see if you get sound through the other amp.

Generally, if the red light is on and there is no significant DC on the speaker terminals, the amp is in good working order (for the older Rockford amps).

Jan 15, 2008 | Rockford Fosgate Punch 500a2 Car Audio...

1 Answer

Amp blowing fuses

The amplifier probably has shorted output transistors.

Disconnect the speakers and RCA cables. Replace the fuses with two 10 amp fuses or a single 20 amp fuse. If the amp blows the fuse when it powers up, the outputs are almost certainly the problem. Don't try it with the two 30 amp fuses. The smaller fuses will provide more protection for the power supply. If the amp powers up with the smaller fuses and they don't blow, check the speakers and the wiring (for shorts to ground or shorts between wires).

Nov 22, 2007 | Rockford Fosgate p-450.4 Car Audio...

1 Answer

Amp arc

What you need to do is first ground your amplifier securely then make sure all connections are fastened. don't remove the speaker connection and listen for sound. If there is no sound power down the unit, and send it to a repair shop because it sound like you may have damaged some components in the unit. But in order to come to this point you have to make sure you ground the unit properly and then make sure all of your connections are secure. Contact me once this is done and you are ready to do some tests.

Aug 28, 2007 | Rockford Fosgate Punch P5002 Car Audio...

1 Answer

Protection light and nothing. ??

How about the speaker itself? This problem can be caused by a blown or defective speaker. If you disconnect the speaker wires from the amp, do you still get the protect light?

Mar 15, 2007 | Clarion APX401.2 Car Audio Amplifier

1 Answer

Blown fuses

I used to have one of those amps also (nice amp btw) Did you try another fuse of the same size?
Is it blowing fuses everytime you put one in or did it just blow that one fuse ?
Is the conection on the battery solid and clean of corrosion build up? Because that is a good amp and if wired properly shouldnt blow out or anything and so if the speaker is not blown then maybe connection is weak somewhere? I would try disconnecting the speakers from it and try a new fuse and if it does not blow the new fuse than amp is ok? and if it does blow the new fuse right away then there must be a short somewhere in the wire or the amp. then disconnect the fuse again and reconnect the speakers and if the fuse blows with the speakers connected but doesnt blow with them disconnected then you know it is a blown speaker causing the problem.

Just currious but what size fuse do you have connected at the battery?

Jan 06, 2007 | Rockford Fosgate Punch P4004 Car Audio...

Not finding what you are looking for?
MTX Thunder 81000D Car Audio Amplifier Logo

104 people viewed this question

Ask a Question

Usually answered in minutes!

Top MTX Car Amplifiers Experts


Level 3 Expert

56798 Answers

Matthew Spark
Matthew Spark

Level 3 Expert

1042 Answers

Larry Spears
Larry Spears

Level 3 Expert

625 Answers

Are you a MTX Car Amplifier Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides