Koss Full Size Professional Studio Stereophones High-Fidelity Performance


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Model Pro4AA

Provantage Code:  KOSS1JV

Condition:  Factory New

  • Product Type: Headphone
  • Connectivity Technology: Wired
  • Earpiece Design: Over-the-head
  • Maximum Frequency Response: 25 kHz
  • Cable Length: 10 ft

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ElectronicsAudio ElectronicsHeadphones/Earphones


Koss PRO4AA Specifications

    Full Size Professional Studio Stereophones High-Fidelity Performance

At a Glance

    • Noise isolating professional studio headphones
    • The first dynamic headphones to deliver true full frequency, high fidelity performance
    • Standard-setting design incorporates performance-enhancing technology
    • Superior isolation, accurate sound reproduction and the excitement of a live performance with every recording
    • Durable steel and generously padded rubber headband
    • Adjustable slide bars ensure snug fit
    • 8 foot coiled cord with 6.3 mm (1/4") plug
    • Covered under the Koss Stereophones Limited Lifetime Warranty


    This full-size professional quality stereophone has long been the headphone of choice for broadcast and recording professionals whose careers demand reliable equipment and superior performance. The PRO4AA features dynamic elements for an exceptionally wide frequency response. Adjustable slide bars ensure a snug fit, also critical for hearing every note and keeping unwanted sounds out. It includes microphone mount hardware for complete versatility. Whether you are a sound professional or simply love music, the PRO4AA will deliver excellent isolation, accurate sound reproduction, and the excitement of a live performance to your recording.


    • Durable steel and rubber headband
    • Impedance: 250 ohms
    • Sensitivity: 95dB SPL/1mW
    • Distortion: <0.1%

Package Contents

    • Pro4AA Stereophone
    • 6.3 mm (¼") screw-on type adapter


Product NameFull Size Professional Studio Stereophones High-Fidelity Performance
Product TypeHeadphone
Earpiece DesignOver-the-head
Earpiece TypeBinaural
Minimum Frequency Response10 Hz
Maximum Frequency Response25 kHz
Connector PlatingGold Plated
Connectivity TechnologyWired
Sound ModeStereo
Host InterfaceMini-phone (3.5mm)
Cable Length10 ft
Product ModelPro4AA
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Koss Model Pro4AA