Sennheiser HD 280 PRO vs Sennheiser HD 650

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HD 280 PRO compared with HD 650

	SennheiserHD 280 PRO	SennheiserHD 650
Overview
Released
Released	2003	2003
Sound
Type
Type	Over-ear	Over-ear
Noise cancelling
Noise cancelling	No	No
Back
Back	Closed	Open
Impedance
Impedance	64 ohms	300 ohms
Bluetooth codecs
Bluetooth codecs	None (wired)	None (wired)
Drivers
Drivers	Dynamic, closed; 8 Hz – 25 kHz; 113 dB SPL; THD 0.1%	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)
Battery
Listening time (maker's claim)
Listening time (maker's claim)	No battery (wired)	No battery (wired)
Design
Weight
Weight	285 g	260 g (better)
Headphone cable
Headphone cable	Yes	Yes
Fit and ear tips
Fit and ear tips	Circumaural (over-ear), closed-back; contact pressure 6 N; ambient noise attenuation up to 32 dB; soft replaceable ear pads; collapsible design with rotating ear cups; polycarbonate construction	Circumaural, open-back; contact pressure approx. 6.0 N
Works with
Works with	Single-sided coiled cable (1.3 m to 3 m) with 3.5 mm jack plug; 6.3 mm adapter	Detachable 3 m oxygen-free copper cable with 6.35 mm plug; 6.35 mm to 3.5 mm adapter
In the box
In the box	HD 280 PRO headphones, 3.5 mm to 6.3 mm jack plug adapter, safety guide	–