Four Class-D Digital Amplifiers Have Been Fine-Tuned To The Soundbar 's Unique Acoustic Architecture/ Two High-Efficiency Center Midwoofers Ensure Faithful Playback Of Mid-Range Frequencies And Solid Bass/ Two Tweeters Create A Crisp High-Frequency Response/ Use The SONOS App To Adjust Bass, Treble, And Loudness/ Patented Low-Velocity Port Design Minimizes Distortion And Rounds Out Low-End Frequencies/ White Finish