Sennheiser 4974 instruction manual Specifications, HD 280 pro, HD 280 silver

Specifications

	HD 280 pro	HD 280-13
	HD 280 silver
Classification	268-7-IEC-DCSC-64R0-2	268-7-IEC-DCSC-03R2-2
(as per IEC 268-7)
Transducer principle	dynamic	dynamic
Impedance	64 Ω (as per IEC 268-7)	300 Ω (as per IEC 268-7)
Long-term max. input power	0.5 W (as per IEC 268-7)	0.5 W (as per IEC 268-7)
Ear coupling	circum-aural	circum-aural
Frequency response	8 Hz – 25 kHz	8 Hz – 25 kHz
(–10 dB referred to 1 kHz)
Sound pressure level	102 dB (as per IEC 268-7)	102 dB (as per IEC 268-7)
	113 dB / 1 Vrms	107 dB / 1 Vrms
Ambient noise attenuation	max. 32 dB	max. 32 dB
THD	< 0.1 % (at 51 kHz, 100 dB SPL) < 0.1 % (at 1 kHz, 100 dB SPL)
Weight	approx. 285 g	approx. 285 g
Contact pressure	approx. 6 N	approx. 6 N
Length of coiled cable	min. 1 m	min. 1 m
	max. 3 m	max. 3 m

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