HA HA check these out

Has anyone heard these do they actually work.

http://www.sonicelectronix.com/item_4816.html#

I haven't used a Boston Acoustic raditor but Yes passive radiators work. This is not a speaker it has no voice coil it's kind of like a tuneable port.

im still lost on how those things work

i works just like a port......the actual sub moves in that thing will push out , sub moves out that thing will suck in ...............moves air just like a port would

how strange, is it for small boxes where theres not enough room for a ported box? how much does it increase the sound? sure would like to see one in action in person

do you put em in your rear deck, or in a box?

^^there located directly over the sub.

You put them in the enclosure. And lowrthnu92 is right, they act like a port, moving more air.

They're not like a port in a box per-say...they're more of an inactive subwoofer that resonates as the active sub resonates theoretically creating more sound output than a single sub would produce without taking up the space that 2 subs would.

holy shallow mounting depth batman