wiring in series

greetings all.  I'm a bit of a newbie to this whole car audio thing, but for years I've loved bass and finally put two subwoofers in my van.  they are both 12" Cerwin Vega V-max, but they are the older ones with the red foam surround, I think they're 300 watts rms, but one is a DVC and the other is an SVC.  right now they're powered by a Kenwood 8102D.  However, in a recent sound off with one of my cousins I won two Kaption CL-12D4 I think.  I'm pretty sure they're DVC's.  In any case, I was wondering if its recommended that I wire them in series to have all four bumping at the same time.  I know its probably a lot, especially for a minivan, but I like cars that go boom hahaha.  I was just wondering if I could get some help on whether or not its possible, and whether or not the ohms of the speakers make a difference and whether or not it can be changed.  I heard that wiring in series also lowers the output to each speaker.  Is this true?  any help would be greatly appreciated.  thanks.

also, I forgot to ask but do the number of voice coils correlate to ohms?  ie, would a single voice coil give 2 ohms while a dual voice coil give 4ohms?

sorry, my mistake.  I lent the Kaptions to a friend and he pulled them out to change boxes and told me they're SVC not DVCs.  does this make a difference or will I risk blowing out the subwoofers or amplifier by wiring them in series?

highly suggest not running different brand woofers nor is it suggested to run a DVC sub and a SVC sub Also what are the impedances of your CV subs?? likely the DVC sub is receiving twice the power than the other one

Go with the pair of Kaptions.  Sometimes "less" is "more" - especially in a van.  -Good Luck

if i'm not mistaken i believe the DVC cerwin has a 4ohm impedance while the SVC is 2ohm, but the SVC was free and i was content with the one so i'm not too worried about it.  from what i understand though the 4ohm is receiving less power than the 2ohm.  the kaptions we're free as well and one is cracked so again i am not too worried about damaging them, just the one DVC cerwin i paid for hahaha.  however they are the same rms and three are SVC's at 2ohms so i don't understand how that would be a problem.  could you please ellaborate?