Наушники — Koss CL-20i

The CL-20i is a wired on-ear headphone from Koss, the Milwaukee company whose SP/3 of 1958 was the first stereophone. Its see-through clear housing leaves the internal parts on view in a style that recalls the 1990s, and the i suffix marks an in-line OneTouch microphone and remote that the plain CL-20 lacks. Koss lists the CL-20i at USD 34.99 against USD 29.99 for the version without a microphone, and backs both with a limited lifetime guarantee.

Key specs that matter

Koss fits 44 mm dynamic drivers behind the clear shells. Koss rates the response from 30 Hz to 20,000 Hz, with an impedance of 60 ohms and a sensitivity of 103 dB SPL at 1 mW. The cord runs 1.8 m and ends in a standard 3.5 mm headphone plug. Weight is about 0.11 kg. There is no noise cancelling circuit and no water resistance rating, so this is a plain passive headphone with a phone-style control added to the cable.

Engineering and use context

Ear pads combine leatherette covers with sponge filling, and they sit on the ear rather than around it. The earcups pivot, and a pair of sliding yokes on the headband adjust the fit to different head sizes. Koss describes the build as lightweight but durable, which suits a headphone that is likely to be thrown in a bag or carried to work every day. The OneTouch button on the cord answers and ends calls and also handles pause, play and track skipping, so a phone can stay in a pocket during use. Because the microphone and remote are built into the cable, the CL-20i targets phone owners, while the CL-20 keeps a simpler cord for listeners who never take calls through their headphones.

Pairing

This impedance and high sensitivity make it easy to drive, so phones, tablets, laptops and portable players reach normal listening levels without a separate headphone amplifier. On a desktop DAC or a hi-fi amplifier with a mini-jack output the cable simply passes audio and the call button goes unused. The cord length leaves enough slack to reach a computer tower or a receiver on a shelf, yet it stays manageable when the headphone is worn with a phone on the move. Owners who need a headphone that runs for hours from a wireless source would have to look elsewhere, since this model has no battery or Bluetooth link and relies entirely on the cord.

Alternatives

The Koss CL-20 keeps the same clear shell and cord at USD 29.99 but drops the in-line microphone and remote.