VIZIO SB4020E-A0 40-Inch 2.0 Home Theater Sound Bar (Old Version) 95dB of room filling, crystal clear sound with less than 1% total harmonic distortion The perfect home theater solution for 42-Inch and larger TVs Powerful audio performance with SRS TruSurround HD and SRS TruVolume technology Connect to your TV with an easy, one-cable setup *Sound Pressure Level measured using pink noise at 1 meter, C-weighted. Total harmonic distortion calculated as electrical measurement of amplifier distortion.