The Beyerdynamic DT 1770 PRO is a closed-back, circumaural (around-the-ear) studio headphone designed for professional use, particularly mixing and mastering. It features a 45mm Tesla neodymium driver, a rugged spring steel headband, and replaceable ear pads and headband pad for comfort and longevity. The single-sided cable is detachable and lockable, and it comes with a hard case for storage and transport
 
Key Specifications: 
Type: Closed-back, circumaural (around-the-ear) 
Driver: 45mm dynamic Tesla neodymium driver 
Impedance: 250 ohms 
Frequency Response: 5Hz - 40kHz 
Sound Pressure Level (SPL): 102 dB SPL (1 mW / 500 Hz) 
Maximum SPL: 125 dB SPL (200 mW / 500 Hz) 
THD: < 0.05% (1 mW / 500 Hz) 
Nominal Power Handling Capacity: 200 mW 
Cable: Single-sided, detachable, and lockable 
Connectors: Gold-plated mini stereo jack (3.5 mm) & 1/4″ adapter (6.35 mm) 
Ear Pads: Velour and artificial leather earpads included 
Headband: Rugged headband made of spring steel with replaceable pad 
Weight: 388g (without cable) 
Accessories: Hard case, straight and coiled cables, velour and leatherette ear pads 
Made in: Germany