Question about MTX Thunder 8302 Car Audio Amplifier

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MTX Thunder 8302 Car Audio Amplifier

My amp was working and now it keeps blowing fuses with no speakers hooked up

Posted by Daniel Champagne on

  • Daniel Champagne
    Daniel Champagne Aug 05, 2007

    It was working after the other problems which I thought I had resolved but now the above problem

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  • 113 Answers

Could be bad mosfets or outputs, needs replace

Posted on Aug 08, 2007

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1 Answer

Onkyo tx-sv424 keeps blowing power up fuse,i blew it hooking up about 8 speakers insteaqd of the 2 i got with it


Unless you hook up the speakers so that you present the correct load to the output amps, you will continue to blow fuses and eventually damage your output stages. And if you hook up all those speakers in parallel you are indeed in deep duty. Get yourself a book regarding speaker wiring, etc.

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Why the fuse blow


Possible causes...
1. Your power wires into the amp are reversed
2. Something in the amp is shorted
3. Your sub is shorted
4. Your sub is incorrectly hooked up and is showing a lower load than the amp can handle.

Check resistance on speakers. And make sure your not overloading amp with incorrect ohm load for speakers.. You raise and lower speaker ohms by wiring them in a series or parallel. It's a good idea to make sure your power cable sizes are correct and can handle the voltage & amperage.

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I hook up my amp with no speakers on it but keeps blowing the fuses on main fuse block coming off batt. what could it be and how much to fix


Fuses blow like that when there's an overload. This is often caused by a semiconductor device that is acting like it is a piece of wire. The most common fault in amps is the devices on the heatsink, that power the speakers. The cost will depend on how much the devices are and how many have gone.

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ok, always use ground and positive from speakers to the amps +/- . Make sure the amp is not grounded. Some amps are made of metal and will ground itself. When ever any fuses pop, this means that something somewhere got grounded. If using metal srews to mount amp that has a metal casing, chances are you will pop a fuse or two. Be careful ajusting the speaker wires with a metal srewdriver, I've done that alot. "POP"

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Amp blowing fuses


Your amp is blowing fuses to protect your circuit. The type of 12V battery does not matter. For whatever reason you are over driving the amp. 2 Ohms sounds like a very low impedance for a car amplifier output. I am assuming you have the two 12" speakers wired in parallel. Most are rated at 4 Ohms which means you are pulling twice the current with the 2 Ohm load. Also, the bigger the speaker, the bigger the magnet, the bigger the coil, the larger the inductance, the heavier the load. Make sure these speakers are matched with your amp. A small amp driving large speakers will shut down at high volumes. Try putting them in different channels. Good Luck.

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well depending on the wattage of the speakers your trying to hook up to the amp if they exeed the maximum wattage then theres a chance u *could* blow a fuse nothing more then that, a fuse protects more expsinsive devices in ur amp, an if ur system keeps blowing fuses after doing that add up the watts 2 all ur speakers,
and remove the less needed
Hope you find this usfull

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Wondering why im blowing fuses


The most common reason for an amp (in good working order) to blow fuses is a speaker load that's impedance is too low. You may need to rewire your speakers.

Let me know if you have any other questions.

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2 Answers

Blowing fues


Are you sure you can put a 2 ohm load on this amp? Thats almost a complete short.

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