The Era 100 SL is a cheaper version of the Sonos Era 100, which remains a part of Sonos' lineup. It also has stereo sound, Wi-Fi and Bluetooth support, a line-in connector, and on speaker controls, but it lacks voice control. Both speakers look very similar and have dual tweeters and a woofer, so you can expect pretty much the same performance. The Era 100 SL is, simply put, the Era 100 for people who don't need voice control.
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