beyerdynamic DT 770 PRO vs beyerdynamic DT 990 PRO

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DT 770 PRO compared with DT 990 PRO

	beyerdynamicDT 770 PRO	beyerdynamicDT 990 PRO
Overview
Released
Released	1985	1985
Sound
Type
Type	Over-ear	Over-ear
Noise cancelling
Noise cancelling	No	No
Back
Back	Closed	Open
Impedance
Impedance	80 ohms	80 ohms
Bluetooth codecs
Bluetooth codecs	None (wired)	None (wired)
Drivers
Drivers	Dynamic, closed, with bass reflex system; 5 – 35,000 Hz; nominal sound pressure level 96 dB; 32, 80 or 250 ohms	Dynamic, open; 5 – 35,000 Hz; nominal sound pressure level 96 dB; 80 or 250 ohms
Battery
Listening time (maker's claim)
Listening time (maker's claim)	No battery (wired)	No battery (wired)
Design
Weight
Weight	270 g	250 g (better)
Headphone cable
Headphone cable	Yes	Yes
Fit and ear tips
Fit and ear tips	Circumaural, closed-back; replaceable ear pads (black leatherette on the 32-ohm version, silver-grey velour on the 80 and 250-ohm versions); headband pressure approx. 3.5 – 5.5 N	Circumaural, open-back; velour ear pads; headband pressure approx. 3.5 – 5.5 N
Works with
Works with	3.5 mm plug with 6.35 mm adapter; 1.6 m straight cable (32 ohms), 3 m straight cable (80 ohms) or 3 m coiled cable (250 ohms)	3.5 mm plug with 6.35 mm adapter; 3 m straight cable (80 ohms) or 3 m coiled cable (250 ohms)