Koss RUK50

Around-the-ear headphones (Blue)

  • Koss RUK50


Item #: 245RUK50L
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Our take on the Koss RUK50

by David Brown

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.

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  • 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

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
Fit Style Around-the-Ear
Earcup Type Closed
Noise-canceling No
Bluetooth No
Frequency Response 20-20k Hz
Sensitivity 99 dB
Impedance 32 Ohms
Weight 6.9 ounces
Cord Length 48"
Airline Adapter Included No
iPod Control No
Volume Control No
Built-in Microphone No
Parts Warranty Lifetime
Labor Warranty Lifetime
Product Research
What's in the box?

Download owner's manual

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

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.


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
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For a more in-depth review and enhanced detailed information on the Koss RUK50, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_245RUK50L/Koss-RUK50-Blue.html ).