wiring dual voice coils specialty

For a two ohm load, the voice coils are wired in series.  Then the woofers are paralleled to the amp.

The first question was easy enough.  The second is a doozy...but you asked about quad coils and then asked about DVC... what do you have, exactly?

I'll cover the DVC part, but I'll leave the quads alone because I've never dealt with those.  This is just for the six 6-ohm drivers, but the same rationale follows for other impedances.  To get the highest possible load, wire in series/series.  A wire from the pos on the amp goes to the first woofer, coil one pos.  Coil one neg goes to coil two pos, then coil two neg goes to the second woofer coil one pos.  And so on, until the last terminal goes back to the amp neg.

Everything is added up.  Each woofer has 12 ohms (coils in series), and there are 6 woofers in series.  12 X 6 = 72 ohms, the highest load.

2nd:  parallel/series:  Like the wiring shown in the top diagram here...NOTE:  the values of the voice coils and the number of woofers are different than your scenario.  Use these two following diagrams as indicators of wiring and nothing else.

The woofers are dual 6 ohm, so their value will be 3 ohms each (coils in parallel).  Wiring in series back to the amp is multiplying 3 (ohms) X 6 (woofers) = 24 ohms.

3rd:  series/parallel, like the diagram in option 2 above.  In this case the individual woofers would each be 12 ohms (coils in series), then when paralleled back to the amp you figure on dividing instead of multiplying.  So 12 (ohms) divided by 6 (woofers) = 2.  You would have a 2 ohm load.

4th:  parallel/parallel. 

Like this illustration, the coils are first wired in parallel.  Each woofer becomes a 3-ohm load.  You have 6 woofers (in parallel), so the math is:  3 (ohms) divided by 6 (woofers) = 0.5 ohms.

Those are all the possibilities, but you can see that only one...series/parallel...is actually feasable in this particular case.

http://www.sounddomain.com/shop/wooferwizard.pl

http://www.rockfordfosgate.com/rftech/wiringwizard.asp

http://www.bcae1.com/srsparll.htm

You have it backwards.  If you place the coils in series you get 8, in parallel you get 2. 

Think of it like water.  In series, all the water must flow through both coils (pipes) so the water must flow twice as far.  In parallel,  the water can flow through both pipes at the same time, so half goes through the first and half flows through the second.  Make sense?

The equation for parallel wiring is 1/Rtotal = 1/R1 + 1/R2 + 1/R3 etc ...  Thye equation for series wiring is Rtotal = R1 + R2 + R3 etc...

Quads are no different from any other speaker.  It's just that each speaker has four voice coils to include rather than one or two.  It is nothing special, you simply have to know Ohms Law.  Check out the info on the left side of this site, including the Series/Parallel calculator.

https://www.the12volt.com/caraudio/boxcalcs.asp#ser

https://www.the12volt.com/caraudio/boxcalcs.asp#par

Links to woofer wiring calculators that will answer most of your questions

Doh!  I guess I missed the last sentence of the last post.  Sorry 'bout that.