Wiring 2 Dual Voice Coil Subs + Other ?s

[bineon 10+ year member]

I have 2 Crossfire dB312D 12" subwoofers and a Crossfire TEK 100.2 400w x 2 Amplifier (2 stereo channels out)

Basically what I've done for now is:

+ to +

- to -

for each sub... But there are 2 +'s and -'s on each sub and I'm assuming that has something to do with them having "DUAL VOICE COILS"

A wiring diagram along with an explanation of Dual Voice Coils would be awesome! Also, does the "400w x 2" mean a total of 800w going to the 2 subs together? Only with the level turned all the way up? I'm pretty new to this stuff but I can catch on relatively easily. So my questions are.

1. How to wire 2 Dual Voice Coil subs?

2. What IS dual voice coil?

3. Does level/gain affect how many watts the amp is outputting?

4. Does the amp put out 2 separate channels of 400w?

Thanks

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[Trendkill 10+ year member]

I'm still learning myself, but here is crutchfield explaining it until some of the pros stop by to answer your questions:

http://www.crutchfield.com/ISEO-rgbtcspd/learningcenter/car/subwoofers_dual.html

 

[bineon 10+ year member]

I'm even more confused now, but not by your link. Thanks for that. Apparently my amp is only 100watts?! Im pretty confused //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif