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Dual or Single VOICE COIL?


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#1 of 6 Jonathan Larson

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Posted July 15 2004 - 08:04 PM

Hello,

I was wondering what the difference is between single and dual voice coil. Does either have an advantage over the other?

Thanks

#2 of 6 Cees Alons

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Posted July 15 2004 - 09:02 PM

Jonathan,

Double coils provide you with a bit more versatility (at extra cost) between impedances. Say, a driver has two 4 Ohms coils, then you can choose to connect either as 8 Ohms (2 x 4 in series), 4 Ohms (single or double), 2 Ohms (2 x 4 in parallel). BTW, I personally would never drive the two 4 Ohms coils from sources that could even slightly be different (i.e. probably never do it other than 8 Ohms, single 4 Ohms, or 2 Ohms). Driving only a single coil will diminish the SPL (emitted sound power) with 3 dB.
I don't find this use particularly useful, in general.

However, the most important use for this design is the possibility to adjust the Thiele-Small parameters of the driver. This is done by driving only one coil and loading the other one with a (variable) resistor. It will change the q-factor, depending on the value of that resistor, which can vary from infinite (open, no resistor at all) to zero (shortcut, no resistor either).

The short answer, therefore, is: it's mostly of use for the designer of the speaker box, not particularly something for the end-user.


Cees

#3 of 6 Mark gas

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Posted July 15 2004 - 09:27 PM

First buy a amp then you will know what type of vc set up to get.

#4 of 6 David.G

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Posted July 24 2004 - 02:39 AM

it depends on the sub you use also. If you need lots of power for a sub getting a DVC is helpful. Since the DVC can be wired to a 2ohm load, you'll be able to get full power from the amp. In case, i now have an ED120.14, but i was originally going to get the DVC version(.44). After talking to Ben(owner) i learned that my sub is very efficient and the only advantage with the DVC was 1. the obvious increase in power draw which leads to little bit more DB, and 2. i might be able to bottom out the sub(not good). These two facts didn't really add up much for me so i went with the .14 and man i'm impressed. My sub is very efficient with small power and sounds very impressive( on par with a W3 or W6 JL sub performance wise). Its only getting 300RMS and i can hit around 127db on Missy Elliots CD, and 130-132s on a bass CD. Not bad for a SQ 12" sub. Depending on what sub you get and what amp you get would really put the nail on the decision. What are you looking at? IMO hooking up 2 subs is easier with a SVC than a DVC since 2 SVC wired in parallel get a 2ohm load which most amps are stable at and the wiring is pretty simple.
David is the car audio guy, Jason is the home audio so if you see a post in car audio thats David, if in Home thats more than likely Jason. Confusing isn't it!!! Also i hope i am allowed to put my sounddomain down on my equipment page. Its car audio but you guys might enjoy it.

http://members.sou...

#5 of 6 Clinton McClure

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Posted July 24 2004 - 11:16 AM

I used to run set-ups with 2 or more SVC subs, (once ran 4 12" in a Cavalier) but decided to save space since my cars are daily drivers and switched to running only 1 DVC with a monoblock bridged to 2ohm. I have ran a Punch Power 10" DVC bridged @ 2ohm (getting about 500w RMS) and hit over 140dB. My current set-up is an Alpine Type-R 12" DVC getting about 600w RMS @ 2ohm and I have so far hit a 143dB this season.

If you want to show off and take a lot of space, SVCs are a good way to do it. If you like a stealthier system with more trunk space, DVCs are the way to go.

#6 of 6 Mark gas

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Posted July 27 2004 - 06:14 PM

SVC's and DVC's have nothing to do with space and showing off. The only thing DVC's do is provide more wiring options.