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Thermal switch or possibly a stressed amplifier module?

My sub is also sucking in when reconnected to amp. It started smoking a while back. and then it worked fine again. When the sound was turned up too loud it would shut off the sub. I got new subs and the amp's led light is on but the subs wont work. How could i fix a thermal switch or stressed amplifier module inside the amp? That was ur solution earlier, and I want to know how much it will cost to fix this problem. thanks

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I would make shure the Plus and negitive are right. Also if it was smoking you probly blew the power supply out of amp. From to many ohms loads. Hope this helps you out

Posted on Jan 13, 2009

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I installed a MTX Thunder 3401 with a PA sub. after turning the car oh every things works great. After about 2 mins of play, the thermal light begins flashing red and it will shut off the amp. After the...


You are def overheating, If the ohms rating of the subwoofer is too low it will cause this same thermal over heat. If you have 2ohms in sub and a 4 ohms stable amp, you will overheat. Check the ohms rating of the sub to make sure this is not the problem

Jan 31, 2011 | MTX Thunder 3401 Car Audio Amplifier

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Jl 1000/1 amp problem


i tried switching my lanzar amp to my jl 1000/1 amp myself last night and as i plugged in the ground.. some smoke came up from where the ground and 12v cords meet the sub.. it wasnt much smoke, just a little. so i plugged my lanzar back in and today at lunch went to get it installed and it seemed to be hittin when i left the car audio place.. but its not hitting like it should. the lanzar hits harder. what went wrong? what does that smoke mean? how do i fix it? thanks. i am worried sick. those amps arent cheap.

on Jul 26, 2008 | Jl Audio 1000/1 Car Audio Amplifier

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My power pyramid sub is smoking i think its the jl 1000/1


If the sub is new, they need to be broken in.

All sub woofers need a break in period of about 5 to 6 hours at medium volume.
The reason is because the glue needs to be cured. This is done by the heat from working.

If you are giving it too much volume too soon, you are burning the glue.

Back off the subs and only play them at medium volume for about a week.

Nov 22, 2009 | Jl Audio 1000/1 Car Audio Amplifier

1 Answer

Power pyramid subs smoking i think the jl 1000/1 is tuned wrong..


If the sub is new, they need to be broken in.

All sub woofers need a break in period of about 5 to 6 hours at medium volume.
The reason is because the glue needs to be cured. This is done by the heat from working.

If you are giving it too much volume too soon, you are burning the glue.

Back off the subs and only play them at medium volume for about a week.

Nov 22, 2009 | Jl Audio 1000/1 Car Audio Amplifier

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Mtx jh600 feed back in subs light on amp the bolt is blinking


check that the ground wire is bolted tightly to the chassis of the vehicle.

Aug 08, 2009 | MTX JackHammer JH600 Car Audio Amplifier

1 Answer

Sub cutting out


500W x 1 @ 2ohm

How did you "switch the sub from 2ohms to 4 ohms"?

If you have the swr-1222d as listed, your only options are wiring 1 or 4 ohm, as it is a dual 2 ohm voicecoil.

If it was wired @ 1 ohm - you may have already done the damage to your amplifier - as it is not rated @ 1ohm mono.

There are 3 reasons the amplifier will go into protect mode while playing...
Thermal - overheating due to too low impedence.
Ground Loop/Short Circuit - Blown voicecoil, bad amplifier ground, tinsel slap, etc.
Overload - Impedence not within specs.

Disconnect every wire (including RCAs) from the amplifier. Reconnect only power and ground - make a short wire to loop from power terminal to remote terminal.

If the amplifier stays on without turning off - remove the jumper, add the remote wire, and try again.

If it turns off - the problem is internal and needs repair.

Still on? plug in 1 rca, and re-try.... then the other.

Still going??

Now use an Ohm Meter - or Digital multimeter set to ohms 20, and check both voicecoils. They should read 2ohms +/- .5ohm.

If they are OK, wire up the 4ohm load (series the voicecoils) and turn the gain on the amplifier to 1/2.

Retry -

If the amplifier continues to fail at higher volumes - the thermal protection relay has become weakened because of your improper wiring, and will need to be repaired to solve your issue.

Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

Jun 10, 2009 | Alpine Type-R SWR-1222D Car Subwoofer

2 Answers

LED Light is on, but no sound from sub at all.. Have double backed on all wires but still nothing! HELP!!


If you've overheated it a number of times, it's possible that you've damaged the amp and it's trying to protect itself even though it's too late. Try disconnecting the sub from the amp. If there's no change, then there's a problem within the amp. It could be a thermal switch or possibly a stressed amplifier module.

Hope this helps. Good Luck!!

Mar 21, 2008 | Car Audio & Video

1 Answer

Sherwood Amplfier


Sounds like you like your music like me... LOUD. If you've done this a number of times, there are a few things that can happen:

1. You've blown the speakers... but you've said it operates for 2 seconds, then cuts out.
2. You've damaged the amplifier modules within the amp and they immediately overheat upon power-up. Does the music come back like 5 or 10 seconds after the unit cuts out?
3. Thermal switch has malfunctioned and just cuts off the power to the amplifier modules as soon as it sees any heat.
4. If you've gotten the amp really HOT during playing, it's possible that it's as simple as the amp modules are only intermittently connected (fatigued/stressed or cold solder joints) at the on the PCB. Just resolder the connections of the amp module to the PCB. I've seen that happen numerous times and that's where I'd place my money.

Jan 02, 2008 | Audio Players & Recorders

2 Answers

Amplifier On - No Sub Sound


Are you certain you put the wires back on the amp the exact way they came off. I am not familiar with this amp but most amps if you look at the terminals where the speakers hook up there will be a plus and a minus. And generally there are four terminals. hence stereo plus and minus left and right. Some even have eight for, four channels. Since the amp is on, not getting hot and you tried two different audio inputs I would suspect speaker wiring or maybe the stuff you put in your trunk bumped a switch on the amplifier. I know this is not the exact answer you are probaly looking for but it is at least a place to start

Jan 11, 2007 | Sony XM-DS1300P5 Car Audio Amplifier

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