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amp wattage vs ohms

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=136951
Printed Date: May 13, 2025 at 3:09 PM


Topic: amp wattage vs ohms

Posted By: h2ss
Subject: amp wattage vs ohms
Date Posted: July 14, 2014 at 2:59 PM

Hello,

I am building a home subwoofer but am unsure of what type of amplified plate I need to order.
The speaker is a Rokford Fosgate P2 rated at 250w RMS - 500w Peak, DVC at 2 ohms. Now most of the amps are rated at 4ohms. If I run the sub in series at a 4 ohm, what will be my new RMS and Peak wattage?

Thanks



Replies:

Posted By: the12volt
Date Posted: July 14, 2014 at 3:23 PM
The same.

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Posted By: h2ss
Date Posted: July 14, 2014 at 3:30 PM
So a resistance changed doesn't equal wattage change?



Posted By: h2ss
Date Posted: July 14, 2014 at 3:36 PM
I should ask it this way...because I am not powering two voice coils at 2ohms with to separate channels at 250 watts each, do I now want to power both together with a 500w amp at 4 ohms? As you can see I am bit lost.



Posted By: the12volt
Date Posted: July 14, 2014 at 4:09 PM
Wiring in parallel versus series will change the load on the amplier. In turn it can change the amount of power produced by the amplier at 1 ohm vs. 4 ohms, if the amplier can safely run at one ohm. Regardless of how you wire the two coils to an amplier, the power handling of the woofer remains the same. Your best bet is to wire them in series to a mono amplier rated at 250 watts at 4 ohms.

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