Bridging an amp with a dvc sub

Hopefully someone might be able to settle an argument I am having with a friend.

If you take a sub with dual 4ohm voice coils and connect it to 2 channels of  a Sony XM-504 4 ch amp what is the best way to wire it up?

Do you run one voice coil off each channel with the low pass filter on and would it be putting a stereo signal through the sub 

Or do you parallel both vc's up and run the amp in bridged mode.

If you parallel both 4ohm vc's together does this give a 2ohm load or does the amp see it as a 1ohm load. 

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tvs

If you connect a DVC 4-ohm speaker in parallel to a stereo amp bridged, the net load is 2-ohms and each of the bridged sides will operate into a 1-ohm load.  Most stereo amps cannot handle this (your Sony amp cannot.)   The best you can do with a DVC 4-ohm sub and your amp is connect the VCs in series (8-ohms) and bridge the rear 2-channels of the amplifier (leaving the other two channels available for other speakers.)  The front channels of that amp cannot be bridged as I recall.

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Ok, for one, I do beleive that this question has been answered many of times.

First of, it is not recomended to wire A DVC sub to seperate cahnnels. The coils of a DVC Sub should be wired either in a Parrallel or Series configuration to each other. And should look something like this.

	Wiring Option #1
	Wiring Option #2 Chris

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Alpine CDA-9833 HU
Diamond Audio M661 Components
MTX Thunder T6.6 Components:rear fill:
Cadence Q400 4 Channel Mains + rears
Thunder 801D Subs
MTX 1004 10's
Dual 4g wire to rear
4g grounds

First of all he said he only has one speaker, but if there are two then the diagrams you posted are the correct ones.  Secondly, while it is not normally recomended to connect voice coils to seperate amplifiers, it can be done if one knows what one is doing.

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Just to clarify things.

There is 1 Boschmann sub with 2x4ohm vc's and one sony amp which is running components and the sub.

The sub is wired up in parallel and bridged onto the rear channels of the amp at the moment.

Obviously 2x 4ohm vc's paralleled will equal 2ohms, but does the amp see it as a 1 or 2 ohm load.If it is 1ohm how does this work?

If it is 1 ohm would I be better to wire the vc's in series to give 8ohms and then bridge it giving 4 ohms ? 

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tvs

Sorry DYohn, I posted the wrong pic.

The amp will see a 2ohm load wired this way.

	Wiring Option #1
	Wiring Option #2

Chris

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Alpine CDA-9833 HU
Diamond Audio M661 Components
MTX Thunder T6.6 Components:rear fill:
Cadence Q400 4 Channel Mains + rears
Thunder 801D Subs
MTX 1004 10's
Dual 4g wire to rear
4g grounds

you don't really understand bridging,

you keep saying, it's 2 ohms, then bridged it's 1,,,, if you only have one speaker,, then it doesn't change the impedence (ohms) by bridging it,,, if it's 2 ohms,,, it's 2 ohms,, so the sub, in parrallel, bridged, is a 2 ohm load,, this is to low of a load for that amp to run, technically,,, your amp is only ment to have a 4 ohm load bridged, so the right way to do it is to wire it at 8 ohms, and then bridge it, BUT, with one sub at 8 ohms on that amp, it will only be putting out half the power it's suposed to, there really isn't a very good way to wire this properly, it's just a bad match with the sub and the amp... but i would do the 8 ohm wire setup, less chance of sending smoke signals out of your trunk

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steve gray wrote:

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Just to clarify things.   The sub is wired up in parallel and bridged onto the rear channels of the amp at the moment.

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This will blow your amp.

steve gray wrote:

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Obviously 2x 4ohm vc's paralleled will equal 2ohms, but does the amp see it as a 1 or 2 ohm load.If it is 1ohm how does this work?.

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The load is 2-ohms.  You are connecting it to two amplifier channels bridged together.  Each amplifier channel  will operate into half the total load, or 1-ohm in this case.  The amp will fry wired like this.  You need to wire for 8-ohms, in which case each of the two amplifier channels will opearate into half the load, or 4-ohms.

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Finally.

That is exactly the answer I was after.Thanks DYohn.

This is not my system .I installed the amp for a customer and another installer sold him the amp afterwards, which is obviously a bad match for the amp. He originally wired onevoice coil off each channel , effectively running tthe vc's in stereo, which is where we got into this disagreement.

Thanks for all the replies.

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tvs

What will happen if the vc's are wired up to each channel of the amp.If the crossover is set on low pass will this make the signal mono or will it still be stereo.Can the sub be run off a stereo signal?

It'll still be stereo.  Yes, this would work as well.

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DYohn] wrote:

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steve gray wrote:

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Just to clarify things.   The sub is wired up in parallel and bridged onto the rear channels of the amp at the moment.

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This will blow your amp.

steve gray wrote:

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Obviously 2x 4ohm vc's paralleled will equal 2ohms, but does the amp see it as a 1 or 2 ohm load.If it is 1ohm how does this work?.

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The load is 2-ohms.  You are connecting it to two amplifier channels bridged together.  Each amplifier channel  will operate into half the total load, or 1-ohm in this case.  The amp will fry wired like this.  You need to wire for 8-ohms, in which case each of the two amplifier channels will opearate into half the load, or 4-ohms.

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Now im really confused..if the voice coils are wired into a 8ohm load the amp will see 4ohms???

8 ohms bridged is the same load on the amp as 4 stereo, for a total of 8 ohms.

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My ex once told me I have a perfect face for radio.