BOSE QUIETCOMFORT 45 Noise

Internal Speaker Driver (40mm, 32 Ohm)

Internal speaker drivers in ANC headphones undergo significant mechanical stress due to the constant reproduction of anti-noise frequencies. Over time, the adhesive holding the diaphragm or the delicate voice coil wires can fatigue, leading to intermittent electrical contact that manifests as crackling or static. Replacing the driver restores the mechanical integrity of the acoustic output.

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Main Logic Board (PCBA)

The mainboard contains the Bluetooth SoC and the Digital Signal Processor (DSP) responsible for the ANC algorithm. If the noise is a constant electronic hiss or digital distortion, it typically indicates a failure in the board's power filtering capacitors or the DAC (Digital-to-Analog Converter). This component manages all audio processing and signal amplification.

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Replacement Ear Cushion Kit

Bose ANC systems rely on a sealed acoustic chamber between the driver and the ear canal. If the protein leather or internal foam of the cushions has degraded or torn, 'noise' can actually be a high-frequency feedback loop caused by the internal feedback microphone picking up the driver's output. Replacing the cushions restores the required passive isolation for the ANC system to function without oscillation.

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