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Wiring Nightmare


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mav434 
Member - Posts: 8
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Joined: January 25, 2005
Posted: October 15, 2005 at 9:40 AM / IP Logged  

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?

Maverick
DYohn 
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Location: Arizona, United States
Posted: October 15, 2005 at 9:44 AM / IP Logged  
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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mav434 
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Joined: January 25, 2005
Posted: October 15, 2005 at 10:03 AM / IP Logged  

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

Maverick
DYohn 
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Posted: October 15, 2005 at 10:17 AM / IP Logged  

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:

Wiring Nightmare -- posted image.

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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mav434 
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Joined: January 25, 2005
Posted: October 15, 2005 at 11:25 AM / IP Logged  
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.
Maverick
DYohn 
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Location: Arizona, United States
Posted: October 15, 2005 at 11:57 AM / IP Logged  

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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mav434 
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Joined: January 25, 2005
Posted: October 15, 2005 at 12:06 PM / IP Logged  
Thank You !!
Maverick

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