Diagnosis
The Trueplay tuning is disabled or tuned for the old location. The speaker adapts its sound to the room. Moving it requires a new tuning.
How to Fix It
Run Trueplay tuning for the new location. On your iPhone or newer iPad, open the Sonos app. Go to Settings > System > Your Era 100 > Trueplay. Follow the on-screen instructions to wave your device around the room. This recalibrates the sound.
If That Didn't Work
Check the speaker's placement. It needs clear space, especially for the side-facing woofer. If it's shoved in a bookshelf or cabinet, the bass will be trapped. Pull it at least 2 inches away from any wall or surface on all sides.
Heads Up
Trueplay tuning is only available on iOS devices. Android users must manually adjust the EQ in the Sonos app under Settings > System > Your Era 100 > EQ to compensate for room placement.