Наушники — Koss UR29

The Koss UR29 is a folding full-size headphone with closed backs that Koss aims at DJs and at listeners who want studio-style full-size headphones in a package that folds for travel. Koss sells it for USD 34.99 with its Limited Lifetime Warranty. Its earcups rotate and fold inward so the whole headphone collapses into a compact, protective shape for carrying.

Key specs that matter

Koss rates the UR29 at 18 to 20,000 Hz, with an impedance of 100 ohms and a sound pressure level of 101 dB SPL at 1 mW. THD stays below 0.2 percent by the maker's figure. The single-sided straight lead measures 2.4 m, ending in a gold-flashed 3.5 mm plug, and Koss packs a gold-flashed 6.3 mm adapter with it.

Engineering and use context

The dynamic elements use diaphragms of 1.4 mil mylar, chosen by Koss for added rigidity to reduce mechanical distortion across the full frequency range. They are driven by anisotropic ferrite magnets, while voice coils of oxygen-free copper wire are used to improve signal conduction. Closed leatherette ear cushions seal around the ear, which blocks outside noise and stops sound from spilling out to people nearby. The single-entry cable runs into one earcup only, and Koss markets the UR29 as a way to get studio-type full-size headphones in a portable format. Because the cups fold, the UR29 can be stored in a bag or a DJ case without taking up the space of a rigid full-size model, while still covering the whole ear when worn.

Pairing

Although the 100 ohm impedance is higher than on most Koss headphones in this price range, Koss states that the magnet system gives high volume even with low-voltage portable devices, so phones and portable players can drive it. The long cable gives enough reach from a DJ mixer or a desktop interface to move around freely, and the fold-in cups let the UR29 be packed between uses. The supplied adapter connects it to DJ mixers, audio interfaces, home amplifiers and other equipment with a full-size headphone socket.

Alternatives

The Koss UR20 is a sealed full-size Koss design rated at 32 ohms and 97 dB SPL, with a response from 30 Hz and the same single-entry cord length.