" Sound Pressure Level measured using pink noise at 1 meter C-weighted Total harmonic distortion calculated as electrical measurement of amplifier distortionbr Complete 51 surround sound home theater solution 42-Inch sound bar with left right and center channels wireless subwoofer and rear satellite speakers Best in class audio performance 102dB of room filling crystal clear surround sound with less than 1 total harmonic distortionWirelessly stream your music from a Smartphone or tablet via Bluetoothbr Premium audio with Dolby Digital and DTS Digital Surround decoding plus DTS Tru Volume and DTS Circle Surround audio post processing br VIZIO S4251w-B4 5.