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RBH SI-12 In-floor/In-ceiling Subwoofer

The SI-12 is comparable to the TS-12 MC Series freestanding subwoofer, with an ingenious twist. The SI-12 is a passive, in-floor/in-ceiling subwoofer which mounts in-between the floor or ceiling joists, and cleverly vents through a “grille” made to look like the register of an HVAC system. 

reviews
Home Theater Magazine
Signature Series (7/98)
Stereophile Guide to HT
Signature Series (10/02)
AudioRevolution.com
Signature Series review (9/01)

awards
AudioRevolution.com
Best of 2001
High End Loudspeakers
Signature Series

technical specs
System Type: In-floor/In-ceiling Subwoofer
Frequency Response: 30Hz-200Hz (±3dB)
Sensitivity: 86dB (2.83V @ 1 Meter)
Recommended Power: 100 - 400 Watts
Drive Units: (1) 12" (305mm) Aluminum Cone Subwoofer
Impedance: 4 Ohms
Cabinet Material: Medium Density Fiberboard (MDF)
Grille Options: Heat vent (in-floor) / Cold-air return (in-ceiling)
Dimensions: 42" H x 13.5" W x 9" D
                     (1,067mm H x 343mm W x 229mm D)
Vent Opening: 6" H x 12" W
                        (152mm H x 305mm W)
Weight: 60lbs (27.22kg)
Warranty: 5 years