Dual voice coil and parallel/ bridged wiring.

[aweir 10+ year member]

I have a four channel amp and am considering components for the front and two 12" DVC subs.

I don't quite understand the true benefits of dual voice coil and this is what is confusing me. I can wire each sub to a different channel and get 75WRMS per channel but what if I bridged both subs together, how would I do this with dual voice coils. this is really complex because there are so many options. I don't know whether to post this in the subwoofer forum or the amp forum.

I understand basic parallel and series wiring but not when dual voice coil is used.

Can someone explain what the optimum setup would be if I had a four channel amp and channel one and two are used for fronts with 3 and 4 being free. I am really confused. Can you combine parallel wiring with channel bridging with two dual voice coil subwoofers? I have NO IDEA.

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[aweir 10+ year member]

is the diagram here

http://www.savefile.com/files/920222

 

[XanderMoser 10+ year member]

Okay, first I need to know the impedance of your DVC subs. How many ohms per coil?

Then I need to know how low your amp is stable to, per channel. 1, 2 or 4 ohms?

Once I know that stuff I can tell you exactly how you want to hook it all up.

 

[Hintzyboy 5,000+ posts]

What amp do you have? That can determine whether it will be beneficial to bridge the 3rd and 4th channels or not. With such a small amp though, I would say your best bet would be to get a single-4 ohm sub and bridge the rear channels on the amp.

 

[aweir 10+ year member]

Thank you

Subs are 4 ohm each

Amp: is a Jensen PowerPlus 840

75 x 4 watts, 4 ohm

110 x 4 watts, 2 ohm

210 x 1 watts, 4 ohm bridged stereo

2/3/4 channel mode switch

Manual says bridged mode is only 4 ohm nominal. Not 2 ohm stable in bridged mode?

I found this site, not sure if it help though.

http://www.bass-enterprises.com/index.asp?PageAction=Custom&ID=22#2dual4ohm

 

[XanderMoser 10+ year member]

Thank you
Subs are 4 ohm each

Amp: is a Jensen PowerPlus 840

75 x 4 watts, 4 ohm

110 x 4 watts, 2 ohm

210 x 1 watts, 4 ohm bridged stereo

2/3/4 channel mode switch

Manual says bridged mode is only 4 ohm nominal. Not 2 ohm stable in bridged mode?

Do you mean 4 ohms per coil? If so, then here is what you do:

Hook up the voice coils together in parallel, on each sub separately. So connect the + of one voice coil to the + of the other voice coil and connect the - of one voice coil to the - of the other voice coil, on each subwoofer. The subs are not connected together.

By connecting the 4 ohm coils this way, they are in parallel and give you 2 ohms for each sub.

Now connect one sub to each channel.

This will push 110 watts into each sub, the most you are going to be able to get safely.

Do you know how to safely set your gains?

And the last part of what you said is true because when two channels of an amp are bridged, each channel "sees" half of the impedance load that is presented to the bridged channels. That's the easiest way to explain it. So an amp that is 2 ohm stable in stereo is 4 ohm stable in mono.

 

[aweir 10+ year member]

I don't know about the gains. I don't have an oscilloscope to check for clipping.

 

[XanderMoser 10+ year member]

You got the diagram correct

You don't need an o-scope, as long as you can hear distortion.

Start with your gain at minimum.

Turn the HU up until you hear distortion, or unti 3/4 volume, whichever comes first. Now turn it down a little until the distortion is completely gone (If you are amping your speakers, then just go to 3/4 volume) To find how how it goes, pause a CD and change the volume.

Now with the CD playing slowly raise the gain on the amp until you hear distortion, then back it off until it's gone. Do that for all the channels.