SONOS SUB GEN 3 Noise

Internal Power Supply Unit (PSU) PCBA

The 'tickling' or clicking noise reported in Gen 3 units is often a result of electromechanical resonance within the SMPS transformer or ceramic capacitors. Magnetostriction in the transformer windings creates physical micro-vibrations that manifest as audible 'cricket' noises during specific load states. Replacing the entire PSU board provides the updated shielding and potting required to dampen these oscillations.

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Low-Frequency High-Excursion Driver Assembly

Rattling during deep bass scenes suggests a mechanical failure of the driver's voice coil alignment or a partial delamination of the spider (the rear suspension). In a force-canceling configuration like the Sonos Sub, any loss of mechanical centering causes the voice coil to strike the magnetic pole piece (bottoming out). Replacing the damaged driver restores the necessary linear excursion path for low-frequency reproduction.

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Internal Wire Harness Dampening Kit

The high internal Sound Pressure Level (SPL) and cabinet vibration can cause internal ribbon cables or power leads to vibrate against the interior chassis walls. If the factory adhesive or foam dampening has degraded or shifted, the cable will create a rhythmic tapping or buzzing sound at specific resonant frequencies. Re-securing these internal components with vibration-resistant dampening material eliminates the sympathetic resonance.

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