Наушники — Koss ED1TCi

The ED1TCi is the communication version of the Koss ED1TC classroom headphone, adding an in-line push-to-talk microphone to a wipe-clean on-ear design. Koss, the Milwaukee firm whose 1958 SP/3 began the stereo headphone business, pitches it at schools, libraries, hospitals, medical facilities and training departments, and lists it at USD 14.99 with a Limited Lifetime Warranty. It sits in the Koss education range next to models such as the UR10i and KPH7iK, and it is finished in black. The company has run its world headquarters from North Port Washington Avenue in Milwaukee since 1970.

Key specs that matter

Koss gives a frequency response of 60 Hz to 20,000 Hz, a lower starting point than the 100 Hz quoted for the ED1TC without a microphone. Impedance is 32 ohms and sensitivity 98 dB SPL. The cable is a straight, dual-entry lead 1.2 m long, fitted with the microphone and terminated in a 3.5 mm plug for devices with a TRRS headset jack. Koss does not publish driver size, weight or microphone sensitivity, and it does not state whether the cups are open or sealed.

Engineering and use context

The ear cups are plastic rather than foam, chosen so that staff can clean them quickly between users with a soft cloth and alcohol-based cleaners. That makes the ED1TCi practical for shared settings where the same set moves from one wearer to the next, including hospitals and medical facilities where hygiene is a daily concern. Koss stresses maximum durability for a multiple user environment, and the plastic body avoids the wear that breaks down foam pads over time. An adjustable headband sets the fit for each wearer. With dual-entry wiring a lead runs into each cup, unlike the single cable of the ED1TC. Koss notes that the in-line microphone lets the owner quickly take a phone call while listening to music and describes the microphone as suited to both education and commercial settings.

Pairing

This low-impedance headphone runs directly from a phone, tablet, laptop or classroom computer with no amplifier. For the microphone to work the source must have a combined TRRS headset socket. The cord suits a user sitting at a desk close to the device, and there is no battery to charge between classes or shifts.

Alternatives

The Koss ED1TC is the simpler sister model with a single-entry cord and no microphone, listed at USD 9.99.