Наушники — Koss UR40

The Koss UR40 is a collapsible over-ear wired headphone built on what Koss calls a hybrid design, combining elements of closed and open headphones in one frame. Leatherette cushions seal the ear while screened ear cups let outside sound through, so the listener stays aware of the surroundings. Koss lists the UR40 at USD 44.99, and it carries the Koss Limited Lifetime Warranty. It is styled in a retro manner, and Koss also presents it for music, lessons and multimedia content in educational settings as well as for personal use.

Key specs that matter

Its rated range runs from 15 to 22,000 Hz, with an impedance of 60 ohms and a sensitivity of 98 dB SPL at 1 mW, and harmonic distortion is rated under 0.2 percent. Each cup holds a 40 mm dynamic transducer driven by neodymium. Its straight two-sided lead is 1.2 m long, with a gold-flashed 3.5 mm plug. Weight is given as roughly 170 g, and Koss labels the construction ultra lightweight, presenting it as the basis for comfort during hours of continuous listening.

Engineering and use context

The diaphragms are titanium-coated high-polymer membranes, and its OFC voice coil windings, according to Koss, give greater volume even from low-voltage portable devices. The headband uses a mesh sling for breathable support on the head. In the hybrid layout, the closed leatherette ear cushions form a tight seal around the ear, while the ear cups themselves are screened rather than solid, giving the open, hear-through character Koss describes. This makes the UR40 different from the fully closed UR20 and UR29, and it means the headphone does not isolate the wearer from the room. The frame folds, so the headphone can be collapsed for storage and carried in a bag. Each ear cup receives its own lead from the dual-entry cord.

Pairing

The UR40 is designed to be used with portable players, phones and computers as well as the headphone output of a home amplifier. For equipment with a 6.3 mm socket, an adapter is required, since the cable ends only in the small plug.

Alternatives

The Koss UR29 is a fully closed, collapsible over-ear sibling with 100 ohm impedance, 101 dB SPL sensitivity and a longer single-entry cord.