Question about Car Audio & Video

# I hooked up a stereo system for a friend its a 250 watt amp and im using a 1200 watt wiring kit is the kit too high for the amp also i got it hooked up and it was working for a few minutes but all i got out of the subs was a slight vibration and then the fuse on the amp blew can you tell me what went wrong

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• Master

Let me address the wiring kit first. No the higher wattage kit is not a problem however you will need to change the inline fuse to an amperage that is more suitable for 250 Watts. The amps main fuse will be able to protect the power supply but no need to have a larger fuse than needed.

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.

Let me know

Posted on Jan 31, 2010

Testimonial: "its a power acoustic amp i think the fuse is a 70 watt fuse was size do i need to put in idk about the subs just that there 12in kicker comps"

• David S. Feb 01, 2010

Fuses are not deteremined by power handling. They are determined by current capable of passing through the fuse. The fuse you have is problem 70 Amps. So you have kicker comp 12s, what is the rated impedance? They come in 4 ohm and 8 ohm. I fyou are blowing fuses I would say you have 4 ohm speakers tied in parallel which would be 2 ohms to the amp. If you want to run bridged mono run the speakers in series. Take the + from one speaker and attache to the appropriate amp terminmal. The - of that speaker would connect to the + of the other speaker. The - from the second speaker would then be attached to the appropriate amp terminal. This would be an 8 ohm load. I would suggest running the amp in stereo. The amp would then see 4 ohms in stereo mode.

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Posted on Jan 02, 2017

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