Why does my amp keep blowing fuses - AVS Forum
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post #1 of 8 Old 06-28-2011, 08:17 PM - Thread Starter
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So today i bridged my dual voice coil sub and now my amp keeps blowing fuses when i turn it up to much... The amp is a 1000 watt and the sub is 600 rms and 1200 max,,, i dont want to have to go through unbridging it.. is there any opinions on whats happening?
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post #2 of 8 Old 06-29-2011, 11:11 AM
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Amps typically like to drive higher impedance when bridged, that is they will not tolerate low-impedance loads. For example, many amps rated to drive 4 ohms normally, state 8 ohms in bridged mode. Depending upon how you connected the amp to the speaker's voice coils, you may have reduced the impedance and/or it may already be too low for your amp to drive in bridged configuration. It's also possible you hooked it up wrong...

My initial guess would be to make sure you have the voice coils connected in series, in the right order (+ to - to + to -), with the outer terminals connected to the amp.

HTH - Don

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post #3 of 8 Old 06-29-2011, 12:35 PM
 
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+1

Without really knowing "what you've done" and having to guess...

Bridged amps NEED to stay above 8ohm.

So, your "dual voice coil" sub. Did you wire it single? Did you wire it dual parallel(IE the way not to have)? Did you wire it dual series(the way to keep it from making the amp crash)?
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post #4 of 8 Old 06-29-2011, 04:40 PM - Thread Starter
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Ok thanks for the answers, i got it figured out but now after like 30 seconds my sub gets a little bit quiter and my amp will burn my hand if i touch it for more then 2 seconds... now can you guys tell me y this is happening
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post #5 of 8 Old 06-29-2011, 06:57 PM
 
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No.

Not till you tell us how the dual voice coil woofer is wired.
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post #6 of 8 Old 06-29-2011, 07:46 PM - Thread Starter
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I only have 1+ and 1- hooked up, i unbridged it
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post #7 of 8 Old 06-29-2011, 08:51 PM
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Not enough info. How about a wiring diagram, and the make and model of speaker and amp.

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post #8 of 8 Old 06-30-2011, 05:42 AM
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As others have said, bridged into too low impedance will cause the amp to get really hot and blow fuses.

It happened to me with regular speakers and a name brand amp. The speakers were 8ohm nominal, but dipped to 2ohms at certain frequencies and that was a little too much for the amp when bridged.

My guess is your amp is rated for 4ohms, wired for 4ohms, but the bridging is makes the amp "see" 2ohms, so you're pulling too much juice and popping fuses.

 

 

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