Subwoofer Plug

You can go to Lowes or HD and get some pipe insulation that fits the size of your port.
It's made out of neoprene with a hole in the center.
It will give you a smaller port and controle excess blume with the bass. Hope this helps. John

Bonded Dacron(http://www.foambymail.com/DACRON/polyester-fiberfill.html)(http://www.ebay.com/itm/27-Wide-Bonded-Dacron-Batting-SOLD-PER-YARD-/390104452113?pt=LH_DefaultDomain_0&hash=item5ad4098c11)works great for damping ports. You can roll it as tightly or loosely as you desire, which will enable you to tune the port to your taste. The stuff is available at most fabric shops.

You can also stuff the port with drinking straws. It's tedious, but it can be done. However, fighting a component to this extreme usually means its days are numbered. These small subwoofers require high power and heavy EQing to reach their maximum performance.

Why don't you call SVS and see if they'll send or sell you a plug? Your model may not have come with one, but all their ported square subs come with foam plugs now to adjust the bass rolloff profile.

Thanks for all the replies!

Hey Johnny, good idea. I want to say that my SVSs did come with a plug eons ago, but I've lost them and, anyway, I'd need three for each. These are the earliest SVS cylinder subs; they may not make anything like this any longer, I don't really know. Still worth checking.

Rrog, interesting idea, although if you're referring to my subs' size, they're not small. I think the newest generations of SVS have gone the mighty mouse approach, but back when I bought they were making subs that made their buyers look like they were compensating for something (no.... The answer is no, I am not compensating... :)

But seriously, I've got the tallest of the passive cylinders from 2002. I think the model was something like 12-46cs ( they are the tall ones, so I might have the height number wrong or something). Anyway, these are big mombajombas; too big for the room they are in now. I am going to be selling one and, depending on how the stuffin' works maybe both.

Zman, Rod: thanks for the leads and ideas. I will look into those ideas. Definitely worth it.

Eldart: I feel like we are talking about the same thing tho, no? To be honest tho, I've never seen a sub advertised as an "acoustic suspension" type. I've seen ported, sealed, different kinds of loadings (or maybe the right nomenclature is different order subs?). Could you point me toward info on acoustic suspension? Thanks!