Sony MDR-7509 HD closed over-ear headphone

The Sony MDR-7509HD is an around-the-ear professional headphone that is ideal for sound monitoring in recording studios, radio, film production, video and virtually any application where high quality audio delivery is required.

Type: Over ear (circum-aural), closed

Usage: Home, studio, portable

Driver type: dynamic

Pads: replaceable, thin pleather, regular foam, ear shaped

Collapsible: yes

Headphone cup connector: fixed

Cable entry: single sided (left).

Cable: 3m coiled in a 3.5mm TRS jack with a 6.3mm screw-on adapter

Inner Pad dimensions: depth = 20mm, height = 55mm, width = 30mm, pinna shaped.

Driver size: 45mm (effective area, driver diameter = 50mm)

Nom. power rating: 3W

Max. voltage: 8.5Vrms (24Vpp)

Max. current: 340mA

Max. S.P.L.: 135 dB

Impedance: 25 Ω (measured)

Efficiency: 104dB @ 1mW

Sensitivity: 120dB @ 1V

Weight: 299 g. (without cable)

Clamping force: medium 4N

Accessories: soft carrying pouch

The cushion is not in its best shape. However, the quality of the audio is excellent. I have taken good care of the headphones.