ok so i have 2 kicker 07cvr10 2ohm dual voice coil subs hooked up to a kicker zx1000.1 amp stable at 2 ohms, ran off of a pioneer p5700 head unit. would it be possible to add 2 old rockford fosgate punch HE2 dual voice coil subs that are 4 ohm impedance each, while maintaining a 2 ohm load on the amp?

 

it's quite simple really. What you've really got is not 4 speakers, you've got 6-4 ohm coils...

 

why are you looking at this
you can but you will not like it

 

The way I read it, he's got two dual-2 subs, and wants to add two dual-4 subs...

 

And no, you wouldn't be able to get 2 ohms out of that mess, you're better off to stick with the same coils - however, even if you did four dual-2ohm subs, you still wouldn't be able to come up with a final 2ohm load, you'd need four dual-4's.

 

The rockford subs can be wired to 3 possibilities 16, 4 or 1 ohm.
Yous current set up can be wired for 8, 2 or .5 ohm.
Combining the two set-ups together is possible but it will sound like crap because the subs will not de receiving eqaul amounts of power.

You can get a final load of 2.66 ohms, but in that wiring configuration, your kicker subs will receive 1/2 the power of Rockfords.

Also, simply adding more speakers won't make your system louder. Whatever wattage your amp will produce into a 2 ohm load is all the wattage available. So by adding more subs, your dividing that total wattage more ways. You are better off keeping all of that power going to just 2 subs (not to mention mixing subs running off of the same amp is really ghetto - the subs have different frequency response curves and typically will not complement each other)