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 do without Wi-Fi.
The new Signa S4 features seven drivers, including two upward-firing speakers, that deliver 3D surround sound. The low-profile design of the Signa S4 looks like it can blend in with any décor, and it ...
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