subs and ohms and wiring oh my.

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=134529
Printed Date: May 14, 2025 at 1:49 AM

Topic: subs and ohms and wiring oh my.

Posted By: mb448
Subject: subs and ohms and wiring oh my.
Date Posted: July 12, 2013 at 7:55 PM

I purchased an alpine pdx-m12 (1200w rms d class amp) and an apline swr-1522d (15" dual 2 ohm voice coil).

My pdx-m12 says it's 2ohm and 4ohm stable at 1200w but a guy told me since my sub is wired at 4ohm I'm only getting half the power.. is that true?

If I get a swr-1542d, alpines dual 4 ohm voice coil, I can wire it properly to 2ohm.

Replies:

Posted By: corlon
Date Posted: July 14, 2013 at 6:11 PM

yes the sub you have now can only be wired to 1 or 4 ohms by itself. if you get the other sub then you can wire it to 2 or 8 ohms by itself.

so yeah. i'd switch the woofer so your getting the most out of your amp.

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nice...

Posted By: DYohn
Date Posted: July 14, 2013 at 6:31 PM

Wrong. That amp produces 1200 watts into 4 ohms and also 1200 watts into 2 ohms. It uses a regulated power supply. Wire the sub for 4-ohms and set your gain properly and you will have all that amplifier can put out.

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Posted By: mb448
Date Posted: July 15, 2013 at 9:58 AM

Yes, that's what it says, 1200w stable at 2 or 4 ohms, but the guy at the local car audio place insisted that i'm not getting the full 1200 out of the amp at 4 ohms..

Posted By: DYohn
Date Posted: July 15, 2013 at 12:54 PM

mb448] wrote:

Yes, that's what it says, 1200w stable at 2 or 4 ohms, but the guy at the local car audio place insisted that i'm not getting the full 1200 out of the amp at 4 ohms..

That guy would be wrong. :)

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Posted By: i am an idiot
Date Posted: July 15, 2013 at 4:28 PM

If you still do not know who to believe, check out the following webpage. https://www.alpine-usa.com/product/view/pdx-m12/Specs

At the very top of the page, it gives you the 4 ohm and 2 ohm power rating. They are both 1200 watts.

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