Polk Audio Signa S4 review: Dolby Atmos at a knockdown price

At a glance Expert’s Rating Pros Dolby Atmos audio is excellent Subwoofer delivers critical low end Three levels of Voice Adjust dialogue enhancement Cons No Wi-Fi for music streaming Can’t be upgraded with rear speakers Our Verdict The affordable Polk Audio Signa S4 soundbar and subwoofer is a fantastic way to experience immersive audio, but it can’t be upgraded with additional speakers, and you’ll have to