Crystal Clear Hi-Fi Sound The Play:1 is custom designed by Sonos to produce rich, powerful HiFi sound that's crystal clear at any volume. It contains two Class-D digital amplifiers perfectly tuned to match the speakers and acoustic architecture. One tweeter creates a crisp and accurate high frequency response plus a 3.5''/9 cm mid-woofer ensures the faithful reproduction of mid-range frequencies crucial for accurate playback of vocals and instruments, as well as delivery of deep, rich bass
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