Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Features

Overview: The Koss Pro/4AA noise-isolating, full-size headphones feature oversized elements and an exceptionally wide frequency response (10Hz-25k Hz). The steel and integrated padded headband lets you use the headphones for extended periods. The generous ear pads and closed design shut out external noise so all you hear is the music. The left earcup has a threaded mount for an optional boom microphone.

History: The Pro/4AA headphones were first introduced in 1970. A staple of music and radio professionals, the Pro/4AA set the standard for high fidelity performance until it was retired in the late 1980s. By popular demand, the model was reintroduced, and remains a favorite with sound professionals and audiophiles. It continues to be manufactured in the USA.

Cord: The heavy duty 8' coiled cord extends from the left earcup, and terminates into a full-sized 1/4" plug. No adapters are included with the Pro/4AA.

Warranty: The Pro/4AA is covered by the Koss Stereophones Limited Lifetime Warranty.

Specifications:

• Frequency Response: 10Hz-25kHz
• Sensitivity (dB/1mW): 95dB
• Nominal Impedance: 250 ohms