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Bridging Subs

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=32445
Printed Date: July 15, 2025 at 8:00 AM


Topic: Bridging Subs

Posted By: cles
Subject: Bridging Subs
Date Posted: May 20, 2004 at 11:09 AM

I have an Alpine MRV-F302 4/3/2 amp, running 2 6X9 speakers and 2 10" subs. The subs are 4 ohm and single voice coil. My question is, can I wire the subs parallel and bridged (ie. a 2 ohm load on the amp) for more power to the subs??



Replies:

Posted By: raydawg357
Date Posted: May 20, 2004 at 12:57 PM
I don't think that amp is 2 ohm stable.  If it isn't, it will overheat and keep cutting off.

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Do it right the first time




Posted By: thepencil
Date Posted: May 20, 2004 at 1:31 PM
"My question is, can I wire the subs parallel and bridged (ie. a 2 ohm load on the amp) for more power to the subs??"

The answer is no. Apline amp when bridge are very stable to run at 4 ohm. Dropping the load down to 2 ohm as raydawg357 said can overheat and eventually cause damage to your amp.   

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Be careful whose advice you buy, but be patient with those who supply it.posted_image




Posted By: cles
Date Posted: May 20, 2004 at 1:50 PM
Okay, I'll leave things alone until I find another amp. Thanks for the replies.




Posted By: cles
Date Posted: May 20, 2004 at 1:53 PM
Okay, here's another dumb question....if I wire them bridged in series to get an 8 ohm load, will I get more power to them than the 2 channel method I have now, the same power or less power??




Posted By: raydawg357
Date Posted: May 20, 2004 at 1:56 PM
You will get less power.  With that amp your only other option would be to get two 8 ohm subs.  This way when you bridge your amp it will see 4 ohms and not overheat.

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Do it right the first time




Posted By: cles
Date Posted: May 20, 2004 at 2:09 PM
Okay....sorry to be a pain...one other option?? Could I run the speakers off the HU, and run just the subs off the amp?? (bridge channels 1 and 2 to one sub, and channels 3 and 4 to the other sub) The amp would see 4 ohms, and should provide 120 watts versus 50 watts to the subs?? (My head unit is a CDA 9833).




Posted By: raydawg357
Date Posted: May 20, 2004 at 2:12 PM
Yes, that would be a good alternative.  You would loose some power from your rear speakers, but you will have more bass.

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Do it right the first time




Posted By: JDub
Date Posted: May 20, 2004 at 2:24 PM

Thats what I would do. But in may car I have two amps one for my speakers and one for my subs. Just keep in mind the more ohms you have the more resistance you are going to get.






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