Subwoofer instal

I disagree with the comment about never mixing DVC and SVC subs.  Although in general I'd try to avoid it, it can still be done with a 1 channel amp.  The main thing is that each subwoofer's effective load on the amplifier has to be the same; as long as that is the case, the total amount of power going to each subwoofer is going to be the exact same, regardless of whether or not they're DVC or SVC.

You would need a DVC sub with 2-ohm voice coils wired in series (4 ohm effective load), or a DVC sub with 8-ohm voice coils wired in parallel (also a 4 ohm effective load), if you were looking to run the DVC along with your 4-ohm SVC sub.

OR, the DVC sub you have now (dual 4-ohm) will only work if your SVC sub had a single 2-ohm or 8-ohm voice coil.

You can fool around with RF's woofer wiring wizard to get a graphical representation of how series and parallel wiring is done, just keep in mind the diagrams shown use identical subs, not mix and match.

Completely agree with you shamrock on all of those points; I just wanted to make sure that everyone out there knows that it is technically possible, given you have the proper equipment.  but I think you're right he's gonna have a hard time finding a sub of the same model line to match up with, and so for his purposes it's not possible.  Thanks for the clarification.