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I hooked up a stereo system for a friend last night, and he has a 250 watt power acoustic amp, and he bought a 1200 watt amp wiring kit, is the wiring kit to powerful for the amp, because i hooked it all up and it was working but all i could hear from the subs was a slight vibration and a few minutes later the fuse in the amp blew, i ran the wires correctly the power on the driver side and the rca and rem wire on the passenger side could my ground not be properly grounded or what

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  • kingjames_19 Jan 31, 2010

    i posted another response as a new one i am new to this website sorry for the inconvenience



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As I said in the previous post no the wiring kit is just fie. Yo uwill need to change the inline fuse and that is about it. The problem exists in how you have your subwoofers wired and what impedance is being presented to the amp. Please read my previous response to your your post.

Posted on Jan 31, 2010

Testimonial: "can you help me on my other problem on the wiring for the speakers to the amp"

  • David S. Jan 31, 2010

    No problem man. From the initial sound of it you have it wired properly. If the fuse in the amp blew it has nothing to do with that wiring. The fuse in the amp is the fuse that resides on the amps power supply. If that fuse blows that means the power amplfier is drawing too much current. This is either due to a shorted output or incorrect wiring of the subwoofer(s)

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Now lets talk about the fuse. First off what kind of amp is it? Just for my knowledge. What is the rated impedance that amp can drive bridged mono or stereo (however you have connected it) If the total impedance presented by the woofers is lower than what the amp can drive the amplifiers power supply will demand more current than is designed for. I guess what I need to know is the model of speaker, model of amplifier and size of the inline fuse (right next to battery). Initial diagnosis would say the load on the amp is too large.

Rule of thumb for calculating impedance. The easy way if you have two or more characteristic impedance that are equal then you can add them and divide by the number of impedance to get your total Load however the formula is as follows,

1/((1/Z1)+(1/Z2)+(1/Z3)+(1/Z4)) or (Z1^-1 +Z2^-1+Z3^-1+Z4^-1)^-1
(They are the same thing, just written differently)

In electrical terms Z is your impedance, the negative exponent just means reciprocal.

So in your case if you have 2 dual voice coil subwoofers with a 4 ohm per coil impedance. If you parallel the two coils you would have a 2 ohm impedance. Then if you parallel the two woofers you would have a 1 ohm impedance. This is to low of a load for your amp to drive.

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