The DT 1770 PRO are beyerdynamic's original closed-back Tesla studio headphones for monitoring, mixing and mastering, with 45 mm Tesla drivers at 250 ohms and two sets of ear pads, replaced by the MKII in 2024.
Reviewers agree the DT 1770 Pro sounds excellent, detailed and clear without hype, and is very well built; Headfonics found it more refined and spacious than the DT 770. Headfonia found the tuning enjoyable for music as well as studio work but better with an amplifier, and all three note it isn't cheap.
45 mm Tesla dynamic drivers, closed; 5 – 40,000 Hz; 102 dB SPL (1 mW, 500 Hz); max. 125 dB SPL (200 mW, 500 Hz); THD < 0.05% (1 mW, 500 Hz); rated power handling 200 mW
Noise cancelling detail
No active noise cancelling; passive attenuation approx. 18 dBA with velour ear pads, approx. 21 dBA with leatherette
Battery
Listening time (maker's claim)
No battery (wired)
Design
Weight
388 g
Headphone cable
Yes
Fit and ear tips
Circumaural, closed-back; nominal headband pressure approx. 7.2 N; spring steel headband; replaceable headband padding and ear pads, velour and black leatherette sets supplied
Works with
3 m straight cable and 5 m coiled cable (extended), detachable, with a 3-pin mini-XLR connector on one side; gold-plated 3.5 mm stereo jack with 6.35 mm adapter (the manual; beyerdynamic's product page lists a 6.35 mm jack plug)
In the box
Headphones, velour ear pads, black leatherette ear pads, 3 m straight cable, 5 m coiled cable, hard case
Pros and cons
Pros
+Closed back isolates for recording and monitoring (approx. 18 dBA with velour pads, 21 dBA with leatherette)
+Detachable mini-XLR cable, with straight and coiled cables included
+Low distortion of under 0.05% (1 mW, 500 Hz)
Cons
−250-ohm impedance calls for a headphone amplifier or studio equipment
−Heavy at 388 g, with a firm headband pressure of about 7.2 N
