SONOS SUB (GEN 3) Noise At High Volume

Internal High-Excursion Transducer

At high volumes, the drivers reach maximum excursion; if the voice coil has shifted or the spider has fatigued, the coil will physically strike the magnet assembly or pole piece. This creates a metallic rattling or 'farting' sound that correlates directly with bass frequency amplitude. Replacing the damaged driver restores the force-canceling balance and eliminates the mechanical interference.

Internal Wiring Harness Adhesive/Foam Kit

High-pressure air movement within the sealed cabinet can cause internal power or data cables to vibrate against the inner housing if their factory adhesive or foam damping has failed. This creates a plastic-on-plastic rattling sound that is often mistaken for a blown speaker. Securing these cables with high-bond adhesive or acoustic foam resolves the resonance.

Replacement Subwoofer Assembly

Because the Sonos Sub Gen 3 is a precision-bonded, sealed enclosure designed for acoustic airtightness, individual component replacement often compromises the sonic signature or cabinet seal. For forensic failures involving internal structural rattles or transducer damage, the manufacturer standard is full unit replacement to ensure the force-canceling mechanics remain calibrated.