BOSE QUIETCOMFORT ULTRA HEADPHONES Hissing In Transparency Mode
System Nominal
The audible hiss in Transparency Mode is the inherent noise floor of the high-gain ambient microphone circuit. To achieve 'Aware Mode,' the system amplifies external environmental sounds via MEMS microphones; this amplification process inevitably elevates the electronic thermal noise inherent in the signal-to-digital conversion, creating a low-level white noise that is a standard byproduct of the device's engineering design.
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