Bose QuietComfort 2 vs Sennheiser HD 650

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QuietComfort 2 compared with HD 650

	BoseQuietComfort 2	SennheiserHD 650
Overview
Released
Released	2003	2003
Sound
Type
Type	Over-ear	Over-ear
Noise cancelling
Noise cancelling	Yes	No
Back
Back	Closed	Open
Impedance
Impedance	–	300 ohms
Bluetooth codecs
Bluetooth codecs	None (wired)	None (wired)
Drivers
Drivers	–	Dynamic, diffuse-field equalised; 10 – 41,000 Hz (–10 dB); 103 dB SPL at 1 kHz (1 Vrms); THD ≤ 0.05% (1 kHz, 1 Vrms); long-term input power max. 500 mW (EN 60-268-7)
Noise cancelling detail
Noise cancelling detail	Noise cancellation works with the audio cable detached; the power switch is on the right earcup	–
Battery
Listening time (maker's claim)
Listening time (maker's claim)	Up to 35 hours	No battery (wired)
Battery life detail
Battery life detail	The 2003 Bose guide states about 35 hours from one AAA alkaline cell; a later Bose guide for a revised QC2 states about 40 hours	–
Design
Weight
Weight	–	260 g
Headphone cable
Headphone cable	Yes	Yes
Controls
Controls	Power switch on the right earcup; Hi/Lo level switch on the cable connector	–
Fit and ear tips
Fit and ear tips	Around-ear cushions and rotating earcups that fold flat into a case	Circumaural, open-back; contact pressure approx. 6.0 N
Works with
Works with	Detachable wired audio cable with 3.5 mm source plug; dual 3.5 mm airline adapter and 6.3 mm stereo adapter described in the guide	Detachable 3 m oxygen-free copper cable with 6.35 mm plug; 6.35 mm to 3.5 mm adapter