Koss KDX300 In-ear Headphones

By Koss


Compact with robust, high fidelity sound, Koss KDX300s are lightweight with an in-ear design that delivers accurate sound reproduction, deep bass, and unbelievable isolation typically found in closed-style headphones. 

Koss KDX300 in-ear headphones feature a dynamic element that is positioned just outside the ear for extended frequency response. KDX300s include small, medium and large silicone ear cushions for a customized fit to enhance isolation when you want to eliminate ambient sounds that interfere with the listening experience.

  • Noise isolating in-ear headphones
  • Powerful speaker driver produces deep bass and crisp sound
  • In-ear design fits snugly and is ideal for active lifestyles
  • Includes a selection of ear cushions for customized fit
  • Soft leatherette carrying case included
  • Koss Limited Lifetime Warranty



Frequency Response 10-20,000 Hz
Impedance 8 ohms
Sensitivity 102 dB SPL/1mW
Cord Straight, Dual Entry, 4ft