Question about MTX Thunder 81000D Car Audio Amplifier

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Mtx81000d 3rd chance

I'm looking for parts for my speaker blower one last time. It was hooked up with all the right wiring and a relay , 0/1 wire, optima 31 series battery, and the amp had been repaired 2 times already with the same thing happening every time. The day it blew it wasnt turned up the outputs of the amp turned in to current and caught my JL w7 on fire. im really just looking for a site or some where to get the transisters i need 2 fix it
also is this a common problem in this amplifier
Its blown $1200 in speakers but i am going to give it 1 more chance

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Re: mtx81000d 3rd chance

The original output transistors (SSP45N20A - if I'm not mistaken) for this amplifier are very difficult to find and there are virtually no substitutes that will work without extensive modification. Many techs try to use the SSP45N20B but they don't work reliably.

If you do find replacements, expect to pay $15 or more each. It's possible that there are other problems also. For example, the over-current protection may not be working properly. When it's working properly, it will generally trip when the output transistors fail (which prevents damage to the subs).

This is an old design. The newer amps will be more reliable and will generally offer better protection for the speakers.

Posted on Nov 19, 2007

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The amp from time to time gives a tone to the speakers even when the rca audio cords are not hooked to the amp the protect light isnt on and all the wires work properly i hooked different amp to the...

You are on the right track. It's not the amp, but it is the rca wires. When you have them plugged into the stereo, you can touch them together and it will make the same sounds you described also, though I don't recommend doing that! Rca wires can be weird sometimes but usually I replace them with new ones. Even a brand new set of cheap ones will do the same thing sometimes. The noise you here is causes by either a small short in the wiring, running the rca's to close to the power wire for the amp (or any other power wire for that matter), and sometimes you can buy a grounding kit for them that is fairly cheap that will help. Most of the time for me, it was just the connections, but replacing them basically took me through all these steps at once. Just remember, you still have a chance that your head unit is the cause by the connections getting old and wore out on the inside. Hope this helps!

Aug 05, 2010 | Hifonics BXI 1606D Car Audio Amplifier

3 Answers

My amp turns on but stay in protect mode

check your wiring, is it properly grounded? is your remote positive wired to your ignition's positive line?

Jun 10, 2010 | Car Amplifiers

1 Answer

Just got this at a sale for 10 dollars, not connectors, how do i install and where to get the connectors, do you have a manual. Also, can I use this to boost my normal car stero system?

First, boosting your original speakers is unreccommended, because the stock speakers are not made for a lot of power. The chances are, that if you hook that up to your stock speakers, you will blow the voice coil. Second, I would go to for my connectors and power wires. They are a wholesale warehouse that have amazing deals on everything. Now lets get to the connectors you would need. You need a power and ground wire (recommend 4 gauge for that Amp). You will also need a a remote turnon wire, and a input cable (depending on your head unit.) Everything is pretty self explanitory when hooking it up, but if you need more help when it gets to that time, just email me, at

Oct 24, 2009 | Verge VGA300M Car Audio Amplifier

1 Answer

How do i intall my amp?

first you need to run a power cable for the battery to where ever you are going to place the amp DO NOT hook the cable to the battery until the very last just wire it to the amp for you will want to ground your amp hook the ground wire to the amp and the other end to a solid piece of metal in the car this is very important if you don't get good metal on metal contact you'll blow a fuse. If you can hide it well strip back a bit of carpeting and use sand paper to remove all paint from the metal and drill a hole for a screw. once that is finished you will need to run a remote wire from the amp to the car stereo usually these are the blue wire on the harness in the dash. once that is hooked up run the rca cables (reds and whites) plug in to amp and then in to back of cd player. once this is all hooked up and fully secure hook the power cable to the battery make good contact and if everything is grounded right you should get the lights on in the amp. Next step hook up the speakers run speaker wire from the amp to your speakers make sure negative goes to negative and positive to positive or you'll get clipping and it will sound like ****. that's pretty much the jist of it. if you have any questions let me know.

Mar 08, 2009 | Sony Xplod XM-554ZR Car Audio Amplifier

1 Answer

Amp has power but now sound

You have not given any information on your models. Chances are you wired them incorrectly. either the first time, or both times. How do you know you burned up the sub and not the amp? chances are the amp is fried, most likely due to wiring the speakers to the wrong impedance.

Nov 19, 2008 | Kicker Car Amplifiers

2 Answers

No remote from Cd player. What to do?

thats a car dvd player right what u would do is to take the back of the unit and look for the female ends of rca's on the unit that they will say rear out put hook them up and run them to the amp and i dont get what u mean about the remote wire but let me no if that helps

Apr 04, 2008 | Jensen A600HLX Car Audio Amplifier

1 Answer


Ideally you would use 1/0 gauge power and ground wire for the amps, and use power distribution blocks to reduce it to 4-gauge for each amp. Any smaller wire would be less than ideal for that much amp power.

If you're buying a power wire kit, it most likely won't have a separate distribution block for the ground wire (usually they have separate ground wire for each amp or one piece that's long enough to cut and have wire for both). This is fine, but you should look for a kit with at least 3 feet of ground wire per amp - any shorter and it's a struggle to mount the amp close enough to a ground point. As above, the main power wire to the battery should be 1/0 gauge.

Lastly if a 1/0 gauge kit is not available, 2 separate 4 gauge kits will work, however that's obviously a lot more wire to run and conceal.

Feb 21, 2008 | Car Amplifiers

2 Answers

Wiring Advice

they are to adjust output levels. yes you can hook up the sub to the amp. it is not wise to hook up the front speakers with the sub though. just get a less powered amp to drive the front speakers. 

Oct 28, 2007 | Infinity 475A Car Audio Amplifier

2 Answers

Amp not powering up??

the sub amp may be damage, shorted. you may have a wrong speaker hook-up the first time you use it. too low impedance may have damage the sub.

May 15, 2007 | Kenwood KAC-8101D Car Audio Amplifier

1 Answer

Amp turns on and stays on but no sound

are you shure you not connect the amplifier in a wrong connection ...B+,GND,ACC.....ok...then checkif the speakers wires stay in good condicions, some times when we intalled the spk wires for the border of the doors a few times skrewered too.check if it hapen. another ....check if the terminal spk is not going at ground whit the chasis another to....4 ohms per channel ,anny voice coil spk short. good look.

Mar 10, 2007 | Sony XM-2200GTX Car Audio Amplifier

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