Sonos Ray SoundbarAUDIO Amplifiers All four Class D digital amplifiers have been fine tuned to the soundbar's unique acoustic architecture. Tweeters Two tweeters create a crisp high frequency response. Midwoofers Two high efficiency midwoofers ensure faithful playback of mid range frequencies and solid bass. Bass Reflex System Proprietary low velocity port design minimizes distortion and rounds out low end frequencies. Adjustable EQ Use the Sonos app to adjust bass,