Stereo Audio Hum Killer


Radio Design Labs

  • $ 105.00
  • Save $ 34.95

The EZ‑HK1 is a superior-quality stereo audio transformer isolation module for use with unbalanced, high impedance audio inputs. 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-HK1 eliminates hum due to ground loops when it is installed between an unbalanced audio source, such as a computer, CD player, cassette player or other consumer audio product, and the input of a grounded amplifier in an audio system.


  • Audio Ground-Loop Hum Elimination
  • Unbalanced Stereo Galvanic Isolation
  • Inputs and Outputs on RCA and Mini Jacks
  • Switch-Selectable Ground Lift for Output Jacks
  • Portable Use or Permanent Installation


  • Gold-Plated RCA Connectors
  • Conversion between Mini-jack and RCA formats
  • Ground-Lift Switch
    Inputs (2):                            Stereo on RCA Phono jacks,  
                                                Stereo Mini-jack, -10 dBV nominal, ground-isolated

    Input Impedance:                10 kΩ

    Outputs (2):                         Stereo on RCA Phono jacks, Stereo Mini-jack, -10 dBV nominal

    Output Impedance:             10 kΩ

    Output Ground Isolation:     Switch-selectable

    Gain:                                    Unity nominal (passive circuit)

    Frequency Response:          20 Hz to 20 kHz (± 1 dB)

    Total Harmonic Distortion:    <0.05% (1 kHz)

    Crosstalk:                             <-75 dB (20 Hz to 10 kHz), <-65 dB (10 kHz to 20 kHz)

    Case dimensions:                 2.9” (7.4 cm)W x 3” (7.6 cm)D

    Mounting size:                      1/6 rack width

    Package Type:                      Cardboard Box

    Package Dimensions:            3.625 x 4.625 x 2.125 in.

    Shipping Weight:                   0.4 lbs.

    WEEE weight:                        0.255 lbs.

    Tariff code:                            8536.90.8085

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