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Re: how do i fix my amp
It sounds like you have shorted output transistors. If that's the case, you'd have to replace them to repair the amp. If you're not interested in learning to do this type of work, you should have the amp repaired professionally.
If you would like to learn to do this type of work, read the following page. If you have any other questions, let me know.
Hey, I hooked my mtx magnum amp up to a car charger and set it at two amps to see if the power light would comr on but smoke started blasting out of it. So i took it apart and this black tower thing thats right behind where the power cord hooks up was blown... can anybody help me out and maby tell me how to fix it
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If the amp is blowing fuses, you could have one of several problems. The only one of those problems you could fix yourself is if you have a shorted speaker. A speaker that is shorted in the voice coil can cause the fuse to blow. To check if this is causing it, dis-connect the speakers and then turn it back on. If no fuse blows there is a good chance that a speaker is shorted, take the speakers to somebody or someplace that can check them properly. If the fuse still blows with no speakers connected, you have an internal problem in the amplifier.
If the fuse blows before you even turn the amp on, you have some shorted components in the power supply. If the fuse blows after the amp gets turned on, you have some shorted components in one or both of the output channels.
Unless you have some experience with electronics and have the proper tools to troubleshoot electronics, there is really nothing you can do yourself to fix the amp if it has internal problems.
You should take it to a repair center and get an estimate for repairing it, that way you can decide if the cost of the repair is worth the price of the repair. Sometimes it is better to just buy a new amp, but you first need to know what it will cost for repairing it. There is no way to tell you how much it will cost to repair without having the amplifier in front of me and troubleshooting it to see exactly what is wrong.
If I can be more help let me know, I have been repairing car and home audio equipment for almost 18 years and can offer you good honest advice.
Technically, the manual says the amp should have 20A fuses, so by putting 25A fuses in, you've allowed more current to get to the amp before the fuses blow than recommended. I'd be more concerned about why the amp is blowing fuses.
If the subs are single 4 ohm voice coils and wired in parallel, you're fine. If they're dual 4 ohm voice coils, and everything (subs and voice coils) are in parallel, you're putting a 1 ohm load on the amp, which it's not rated for.
You will need to have the amp bench tested at full load to see if there is a pending problem. It will need to see with speaker loading resistors, how much current the amp is drawing and at different frequencies. if the amp checks out with the proper current, at the rated output, have the speaker checked out. Good Luck
You are probably presenting too low an impedance load to the amplifier. In bridged mode the amp must be connected to a minimum 4-ohm load. If your subwoofer is a dual voice coil type with 4-ohm voice coils, you cannot wire the voice coils in parallel and connect it to the bridged amplifier. If you have a sub with dual 2-ohm voice coils, you can wire the voice coils in series and connect it to the amplifier in bridged mode.
To connect voice coils in series: Connect a wire from the negative terminal of one coil to the positive terminal on the other coil. Connect the unused positive and negative terminals to the amplifier's output.
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?