Wiring Nightmare

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=64425
Printed Date: July 05, 2025 at 2:54 AM

Topic: Wiring Nightmare

Posted By: mav434
Subject: Wiring Nightmare
Date Posted: October 15, 2005 at 9:40 AM

I have 2, DVC 4ohm subs in one box. I have a 4 channel bridgable amp, with a built in crossover, I also have 2 passive crossovers inside of the sub box, one to each sub was the original plan. Now, I'm lost.

Can someone please tell me how this mess should be wired?

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Maverick

Replies:

Posted By: DYohn
Date Posted: October 15, 2005 at 9:44 AM

If the subwoofers are designed with included passive crossovers, turn OFF the crossover on the amp. As far as if the amp will handle the subs, please post the make/model of each.

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Posted By: mav434
Date Posted: October 15, 2005 at 10:03 AM

Amp is VRA4.0 www.roadmasterusa.com, passive crossovers for the subs were built and installed after the sub box was built, they did not come with the subs.

Thanks

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Maverick

Posted By: DYohn
Date Posted: October 15, 2005 at 10:17 AM

Roadmaster, Ugh. Oh well, you've got it and want to use it, here's how. That amp will handle no lower than a 4 ohm bridged load. If your subs are DVC 4-ohm, that means you must wire each sub for 8-ohms (voice coils in series) and then the two subs in parallel for a net 4-ohm load. Bridge the rear channels to this load. Your owner's manual shows how to make the connection. Here's how to wire the subs:

I recommend taking the passive crossovers OUT of the system altogether and using the LOW PASS filter in the amp for best results.

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Posted By: mav434
Date Posted: October 15, 2005 at 11:25 AM

OK, Thanks! Just one more little item, Can I throw a 10" DVC sub on the front channels bridged? And there is no low pass filter on the amp that I can see.

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Maverick

Posted By: DYohn
Date Posted: October 15, 2005 at 11:57 AM

mav434 wrote:

OK, Thanks! Just one more little item, Can I throw a 10" DVC sub on the front channels bridged? And there is no low pass filter on the amp that I can see.

Sure, but only if you wire it for 8-ohms (VCs in series) otherwise you'll fry the amp. And on these amps the LP filter is activated by placing the crossover switch in the "bass" position.

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Posted By: mav434
Date Posted: October 15, 2005 at 12:06 PM

Thank You !!

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Maverick