Diagnosis
Sound ports are clogged with dust and debris, or the speaker is vibrating against a surface. The driver can't move freely, causing distortion.
How to Fix It
First, power it off and unplug it. Use a soft, dry microfiber cloth to wipe the entire fabric surface. For the rear bass port, use a can of compressed air to gently blast out dust—do not insert anything into the port. Ensure the speaker is on a stable, non-resonant surface, not directly touching a wall.
If That Didn't Work
Check the EQ settings in the Google Home app. Go to the device settings, tap Audio, then adjust 'Bass' and 'Treble'. If someone cranked the bass to max, it can easily cause distortion. Try a more neutral setting.
Heads Up
Never use liquids, vacuum cleaners, or sharp objects to clean the fabric or ports. You'll damage the speaker permanently.