ohms law?

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=71497
Printed Date: May 08, 2024 at 10:09 PM

Topic: ohms law?

Posted By: mrhookupz
Subject: ohms law?
Date Posted: January 25, 2006 at 6:08 PM

hey, i have 2 dvc 2ohm subs if i wire them parallel is 0.5 ohms right, now i asked some one and they told me that there is a difference to that depending on the amp you connect it to i have a 1 ohm stable amp so im lost now lil help thanks

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.:CHICAGO:STUNZ:.

Replies:

Posted By: remarkable53
Date Posted: January 25, 2006 at 6:50 PM

i recommend that you series each of the voice coils on each of your woofers so that each speaker would read 4ohms on a DMM. Than parrellell the two speakers together which would bring your final impedance to 2ohms which will let your amp run cooler and maybe allow the woofers to make it to Valentines Day! Hey good luck...

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remarkable53

Posted By: the12volt
Date Posted: January 25, 2006 at 6:58 PM

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Posted By: stevdart
Date Posted: January 25, 2006 at 8:04 PM

You're asking how Ohm's Law fits in with how you wire the subs? When you wire the subs and connect them to the amplifier, you've placed an impedance load on the amp. It is that impedance load that will enable the amplifier to produce power; no load = no output. That's where Ohm's Law comes into play. Ohm's Law describes how the electrical forces power, resistance (impedance), current and voltage interact with each other. These are steadfast, unchangeable physical laws.

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In the chart you can see that the base formulae describe these interactions of the four forces. P = I X E and E = I X R. The groups of formulae listed below those are variations of those basics that will specifically lead you to an answer you might be looking for.

With your wiring concern, the amount of impedance load you wire those subs to will cause the amplifier to work in a specific way. It is rated, that is, built for and tested to produce a limited amount of current. All electrical devices have limitations. A 1/2 ohm resistive load would cause it to produce more current 'I' than it was built to handle and so it would shut off or burn up trying to produce it. Its 'R' limit is 1 ohm at the extreme limit and will accept any load at 1 ohm or higher. That's why, with the subs you have, the lowest wiring impedance option is 2 ohms.

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Posted By: safe
Date Posted: January 31, 2006 at 3:19 AM

I was just reading your response and out of courisity what would the effect be if the resistance was lower ie say 12ohm or 16?? would the lesser loading damage the amp or speaker. thanks

Posted By: darthness
Date Posted: January 31, 2006 at 6:12 AM

less power out of the amp...

Posted By: DYohn
Date Posted: January 31, 2006 at 8:36 AM

The only time a solid state amp will be damaged by speaker loading is if the total impedance is too low. Then it can overload the amplifier. Higher impedance loads are never a problem for SS amps. Speaker do not care as long as you do not overpower them.

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