Bentley Acoustics RW600 Active down-firing Subwoofer with rear Breather PORT.
R Series Subwoofers by Bentley Acoustics was designed to give optimal performance and quality bass.  Blending perfectly with movies and music without shudder or boomy bass.

The 10cm Port breather helps the 12" sub woofer move more air with a smaller cabinet, but giving movies the extra bass it needs while still keeping its composure with music.
 
In collaboration with Rockford Fosgate the optimal enclosure size was made for this remarkable bass addition to any home cinema or music room.
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Drive Units : 1 x (12") 300 mm PP cone long-throw
Frequency Response: 20- 140 Hz ±3 dB
Amplifier Power Output : 300 W
Peak Power Output : 600 W