I got a pair of the Era 100’s, and I’m quite disappointed by the bass extension. It is noticeably worse than the Sonos One. I did a nearfield measurement on them and it confirmed what I heard. The brown curve is the Era 100 and the green curve is the One. This is measured with no bass boost, no loudness, and at very low volumes to not trigger the limiter. The -3dB point on the Era 100 is at 50Hz when the -3dB point on the One is at 40Hz.
 

In the video below from Sonos’s own YouTube channel, Sonos claims “a 25% larger woofer increases bass extension, while the volume is turned up, delivering a much deeper low end than the Sonos One” (timestamp 0:48). This is clearly not true. The Era 100 clearly has less bass extension than the Sonos One. To make sure I didn’t have a defective speaker, I even measured 3 different Era 100’s, the response is identical. This is measured on a MacBook Pro with Room EQ Wizard using a cross spectrum calibrated UMIK-1 microphone, placed 1mm away from the speaker grille pointing at the woofer. I have extensive experience with measuring speakers, and I’ve also measured the Five (F3 is at 26Hz, very impressive), the Sub (F3 at 32Hz), Roam (F3 at 65Hz, very impressive), as well as many other much much more expensive speakers. Sonos usually does a fantastic job on bass, so what’s with the poor bass extension on the Era 100?