VIZIO SB4021M-B1 40-Inch 2.1 Home Theater Sound Bar with Wireless Subwoofer 101dB of room rocking, crystal clear sound with less than 1% total harmonic distortion* Stylish and slim - perfect complement for 42" and larger TVs Wireless subwoofer adds rich, powerful bass from anywhere in the room** Sound Pressure Level measured using pink noise at 1 meter, C-weighted. Total harmonic distortion calculated as electrical measurement of amplifier distortion. Wireless Subwoofer range approximately 60-Feet - line of sight from Sound bar.