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Koss RUK50

Around-the-ear headphones (Blue)

Item # 245RUK50L

This item is no longer available.

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Our take on the Koss RUK50

Add some color to your music

Koss has long been known for making great-sounding portable headphones that won't break the bank. Their RUK50 headphones deliver engaging sound with deep, powerful bass in a unique around-the-ear headphone. The RUK50 features a closed-back design, minimizing external noise and keeping sound from leaking out and disturbing others, so you can listen anywhere. The padded earcups and headband provide plenty of cushioning for long-lasting comfort. And the lightweight design makes the RUK50 perfect for on-the-go listening with a mobile phone or music player. Available in four bold designs, these fun headphones will keep your head bobbing as their bright colors turn heads.

Product Highlights:

  • closed-back design keeps out external noise for listening in any environment
  • earcups fold flat for easy storage
  • 4-foot miniplug cable
  • frequency response: 20-20,000 Hz
  • sensitivity: 99 dB
  • impedance: 32 ohms
  • warranty: lifetime
  • Our 60-day money-back guarantee

What's in the Box:

  • Blue over-ear headphones with attached 4' straight cord (3.5mm plug)
  • Limited Lifetime warranty sheet

Hands-on research

Features and Specs

Fit Style Over-the-ear
Earcup Type Closed
Earcup Width x Height 3.13" x 3.87"
Noise-canceling No
Bluetooth No
Mic For Taking Calls No
iPhone Control ---
Lightning Connector No
Android Control ---
Frequency Response 20-20k Hz
Sensitivity 99 dB
Impedance 32 Ohms
Weight 6.9 ounces
Cord Length 48"
1/4-inch Adapter Included No
Volume Control No
Parts Warranty Lifetime
Labor Warranty Lifetime

Product Research


Overview: The Koss Rukus-series RUK50 full-size headphones are designed for maximum comfort. They feature soft isolating ear cushions and a padded headband that allow you to listen for hours. The noise-isolating fit blocks external noise, so all you hear is the music. The earcups pivot so you can lay them flat for storage or packing in a suitcase.

Cord: The headphones have a 4' heavy-duty cable that exits the left earcup and terminates with a straight 3.5mm plug.

Warranty: The RUK50s are covered by the Koss Stereophones Limited Lifetime Warranty.


  • Frequency Response: 20Hz-20kHz
  • Sensitivity (dB/1mW): 99dB
  • Nominal Impedance: 32 ohms

Our Product Research Team

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