The Mackie MC-100 are closed-back, over-ear reference headphones offering passive noise isolation and extended low-frequency reproduction. Padded earcups and an adjustable headband ensure comfortable wearing for long periods. A detachable 3m single-sided cable has a 3.5mm stereo mini-jack and includes a gold-plated 1/4" adaptor. 40mm Dynamic Drivers 15hz-20kHz frequency Response Over-Ear Closed-Back Design Passive Noise Isolation Ideal for musicians and sound engineers, the headphones have large 40mm drivers in a precision-tuned enclosure deliver a wide frequency response of 15 Hz to 20 kHz.