AlanZ
Screenwriter
What you fail to mention is the fact that it is nearly impossible to do so. Aside from the PCi 16-46, most every other SVS sub will either pummel into submission any other brand of sub you put anywhere near it, or it'll literally walk over to it and consume it whole.
I've mentioned the fact that I've witnessed this phenomenon first hand with an SVS PCi 25-31 and a Paradigm PDR-10. People have sent me countless personal messages asking if this really happened......yes, it really did happen. Usually the SVS will make this grunting, snorting type of sound before it takes such drastic action against a rival subwoofer, so vigilance is the only way to prevent such an occurance. If you have any thoughts of putting your non-SVS sub on Ebay or whatever, do yourself a favor and keep it somewhere the SVS can't see it.
If you have either the 25-31 PCi or PC+ and fail to heed my advice, God help you......