Koss Porta Pro (1984)

An on-ear headphone introduced in 1984, known for its collapsible design and open-back dynamic drivers.

Overview

The Koss Porta Pro is an on-ear headphone introduced in 1984 by Koss, a company founded by John C. Koss. Marketed as a portable audio solution, it was designed to deliver high-fidelity sound in a compact, foldable form. It features dynamic drivers and an open-back design, contributing to its wide frequency response and natural sound signature. The model is part of Koss’s Retro Style Collection and shares acoustic design principles with other legendary Koss headphones.

Specifications

Production Year	1984
Frequency Response	15Hz – 25kHz
Impedance	60 Ohms
Driver Size	30 Millimeters
Ear Placement	On Ear
Form Factor	On Ear
Design	Collapsible Design
Type	open back headphone
Driver Description	dynamic elements
SPL	111 dB

Design

The Koss Porta Pro features an all-metal headband with no padding and a collapsible design for portability. It uses dynamic elements to deliver sound, housed in an open-back configuration that enhances soundstage and imaging.

Context

The Porta Pro was unveiled in 1984 as a revolutionary personal portable headphone, setting performance and comfort standards worldwide. It was the first of its kind introduced by John C. Koss and remains part of the Koss Retro Style Collection.

Market

The original retail price was $49. Current market prices for the classic model range between $26.99 and $40, while the Porta Pro® Wireless is listed at $99.99.