Наушники — Koss Porta Pro

The Porta Pro is a Koss on-ear headphone with a cable, first introduced in 1984 and still in production at a list price of USD 49.99. Koss counts it among the most popular headphones worldwide, and the model has grown into a family that includes Wireless, Utility, Mic/Remote and limited edition versions, as well as special colourways made with partners such as ModRetro. Current Koss prices are USD 99.99 for the Porta Pro Wireless, USD 59.99 for the Mic/Remote version and USD 59.99 for the Rhythm Beige and Black Gold limited editions. The standard version covered here uses a fixed analogue cable.

Key specs that matter

Koss rates the dynamic elements at 60 ohms with a sensitivity of 101 dB SPL for 1 mW and a frequency response of 15 Hz to 25,000 Hz. A straight 1.2 m lead with dual entry ends in a standard 3.5 mm jack, and it is not detachable. The headphone weighs 75 g. A Limited Lifetime Warranty covers it, as it does all wired Koss headphones.

Engineering and use context

The design centres on portability. The headband adjusts in length, and the earpieces fold so that the headphone collapses into a compact size for a bag or pocket. Adjustable temporal pads, which Koss calls ComfortZone, let the wearer relieve pressure where the frame meets the side of the head, and foam cushions sit on the earpieces. Koss sells standard and oversized coloured ear cushions for the Porta Pro separately, so worn foam can be replaced and the look changed. A Porta Pro pouch and a Porta Pro hard case are also offered for carrying the folded headphone. The model uses a passive open-air construction without a battery, microphone or wireless module, and a black colourway called Porta Pro Black is sold at the same price as the standard silver and black version.

Pairing

The sensitivity and impedance ratings allow the Porta Pro to run from the jack of a phone, laptop, tablet or portable player without an external amplifier. Sources without an analogue socket need a Lightning or USB-C dongle, and an adapter lets the jack fit the 6.3 mm output of a home amplifier or receiver. Owners who want to switch between cable and Bluetooth can look to the Utility version, whose cord is detachable.

Alternatives

The Koss Porta Pro Utility shares the electrical ratings but adds a detachable analogue cord that can be swapped for a USB-C cord or a Bluetooth adapter, at USD 49.99.