Passive radiator technology has been around for a long time but these are the only speakers I found that employ this technique in the satellites

The subwoofer goes deeper than I could expect out of an 8" due to the passive radiator, I assume.

The thing I think that makes these sound so amazing is that each satellite speaker has a passive radiator that's pointed upward.

The center speaker has a passive radiator on each end, and the sub also has a passive radiator.

when it worked i liked it, but the sub i have i had to send back because it has blown now 4-5 times