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Audio and Video Ground-Loop Hum Elimination
Radio Design Labs EZ-HK3 Audio/Video Hum Killer
Radio Design Labs EZ-HK3 Audio/Video Hum Killer
Radio Design Labs EZ-HK3 Audio/Video Hum Killer
Item# 77996
Price: Normally $126.35 
Hot Deal $119.32
Free shipping on orders over $175 - See Details


  • Unbalanced stereo galvanic isolation
  • 75 Ohm composite video galvanic isolation
  • Input and output RCA jacks
  • Switch-selectable ground lift for output jacks
  • Portable use or permanent installation
  • Excellent low and high video frequency response

Essential Info

The EZ-HK3 is a stereo audio and composite video transformer isolation module for use with unbalanced, high impedance audio
inputs and standard 75 ohm composite video. Input and output connections are provided on gold-plated RCA jacks.

The shield connection of each INPUT jack is electrically isolated from the case and from the output ground. The shield connection of each OUTPUT jack is connected to the case shield through a rear-panel ground-lift switch.

The EZ-HK3 eliminates hum due to ground loops when it is installed between an unbalanced audio/video source, such as a computer or DVD player, and the input of a grounded amplifier and video monitor or projector in an A/V system.

For a unit that provides audio hum elimination only, please see the EZ-HK2.



  • Video Input: Composite Video, 1 V p-p nominal, ground-isolated
  • Input Impedance: 75 Ohms
  • Video Output: Composite Video, 1 V p-p nominal
  • Output Impedance: 75 Ohms
  • Video Bandwidth: 40 Hz to >5 MHz
  • Audio Input: Stereo on RCA Phono jacks, -10 dBV nominal, ground-isolated
  • Audio Input Impedance: 10k Ohms
  • Audio Output: Stereo on RCA Phono jacks, -10 dBV nominal
  • Audio Output Impedance: 10k Ohms
  • Audio Frequency Response: 20 Hz to 20 kHz (+/- 1 dB)
  • Audio Total Harmonic Distortion: <0.05% (1 kHz)
  • Crosstalk (audio channel to channel): <-75 dB (20 Hz to 10 kHz), <-65 dB (10 kHz to 20 kHz)
  • Crosstalk (video to audio): <-80 dB (referred to -10 dBV)
  • Crosstalk (audio to video): <-85 dB (referred to 1 V p-p)
  • Output Ground Isolation: Switch-selectable (lifts audio and video grounds)
  • Gain (audio and video): Unity nominal (passive circuit)
  • Warranty: 3 Years; contact RDL technical support department for assistance
  • Case dimensions: 2.9" (7.4 cm)W x 3" (7.6 cm)D
  • Mounting size: 1/6 rack width


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