Can I use one coil on a DVC subwoofer? - diyAudio
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Old 19th December 2013, 11:33 PM   #1
chipper is offline chipper  United States
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Default Can I use one coil on a DVC subwoofer?

Ok I just got me a kicker cvx 12" in a sealed box sounds bad@$$! Bass is nice and loud but unfortunately it's a dual 4 ohm and the amp I have is the old school 2001 model rockford fosgate punch 800.2. And you guys know they won't do 2 ohm mono (maybe but I don want to risk blowing it) or killing a channel! So according to the specs of the sub it's rated 750 rms and 1500 max? Can I just run one coil bridged to the 800.2? I haven't tried it yet just looking for opionions. Thanks guys !
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Old 19th December 2013, 11:50 PM   #2
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Well, yes, you can run the woofer with only one coil driven, but only to a little more than half rated power. It will also mess with the typically presented T/S parameters.

I'd run the amp 2 channel mode (mono signal) with a coil per output, so both amplifier outputs see their rated 4 ohm load. Verify proper polarities at low power.
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Old 20th December 2013, 03:06 AM   #3
Randy62 is offline Randy62  United States
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Those amps are under rated at 4 ohms stereo mode.They typically put out close to 300watts x 2 or 600 bridged at 8 ohms.
You can run the coils in series and bridge it at 8 ohms or do like Andrew said and run it 4 ohm stereo with a coil on each channel.
But Im sure we all know it will run 2 ohm mono if asked to.I just wouldn't drive it into hard clipping all the time like that.
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Old 20th December 2013, 03:13 AM   #4
chipper is offline chipper  United States
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Or what if I just used one coil and turn both gains on each channel at 50% then run bridged? I currently have the sub wired at 2 ohm running on one channel and it still puts out tremendous bass !! But I'm only using half the amp. I'd like to keep it at 4 ohm. Besides I think the coil will get a clean signal from the amp since it's an 800 watt amp ?
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Old 20th December 2013, 03:24 AM   #5
Randy62 is offline Randy62  United States
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Because,Like Andrew said,it will only have 1/2 power rating.Plus it will only have 1/2 the BL which is the motor driving force so it wont hit as hard and sound sluggish compared to when both coils are used.It will hit way harder with both coils and 600 watts then with 1 coil and a few more watts.
Try it bridged or stereo mode like suggested.You get a big smile.I guaranty it.
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Old 20th December 2013, 03:27 AM   #6
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For the sake of performance and reliability, heed post 5

Your reasonable options are two channels at 4 ohms or 8 ohms (series wired coils) bridged.

Last edited by Andrew Eckhardt; 20th December 2013 at 03:30 AM.
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Old 20th December 2013, 03:29 AM   #7
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If you're taking votes, I'd vote 1 coil per channel. I really don't think that one coil bridged on this amp will be very good for the speaker.

Unless the preamp output from your head unit is VERY weak, setting the gains to 50% won't be very effective if you're doing it to protect the speaker.

Connect 1 coil and while it's playing, then connect the second coil to the other channel. It should get louder. If it goes almost silent, you have the polarity of 1 coil backwards.
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Old 20th December 2013, 03:45 AM   #8
Randy62 is offline Randy62  United States
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Try to set both gains so you have the same voltage on each channel.Use a test disc and a volt meter if you have one.This is more important then most people realize when it comes to these amps.

Also that amp does about 1000 watts when bridged at 4 ohms.

Last edited by Randy62; 20th December 2013 at 03:48 AM. Reason: add warning.
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Old 20th December 2013, 03:53 AM   #9
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Two ways you can go IMHO. One like Perry said, or Two: like Andrew Eckhardt posted: connect the coils together to form a 8 ohm bridge load to the amp, which will equal the same as what Perry said, since each coil will be loading each channel at 4 ohms each either way. Theoretically there should be zero voltage at the point the coils connect in the center, if your amps output is balanced properly and ohms law holds up to its predictable out come. Hopefully Rockford built both channels to have the exact same gain factors and your signal is a true mono signal before its in the RCAs < in a perfect world I'm speaking of there>

I don't think you will find a speaker maker out there that will say its OK to use one coil. This might have to do with the dual voice coil design since one is likely sitting in front of the other on the coil former, and you will be only applying power to either the front half of the magnet field or the back half depending on the single coil you tried to use. With both coils in use the TS parameters should be in the ball park, but on one coil they would not apply I am fairly sure due to the fact only part of the magnetic field is in use... hope this vote helps also...

Last edited by 1moreamp; 20th December 2013 at 03:58 AM.
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Old 20th December 2013, 04:18 AM   #10
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If the coils are wound with a start and end of each coil resting at the center of the gap, there should be severe (easily detectable) harmonic distortion at moderate sine tone drive with only one coil driven in a sealed system. When I typed that one coil can be driven I meant that yes it's physically possible, not that it will get you anything desirable.
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