RDL EZ-HK1 Stereo Audio Hum Killer

RDL EZ-HK1 Stereo Audio Hum Killer

RDL EZ-HK1 Stereo Audio Hum Killer

RDL EZ-HK1 Stereo Audio Hum Killer

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Product Highlights

  • Gold-Plated RCA Connectors
  • Audio Ground-Loop Hum Elimination
  • Unbalanced Stereo Galvanic Isolation
  • Inputs & Outputs on RCA & Mini Jacks
  • Switch-Selectable Ground Lift for Output
  • Portable Use or Permanent Installation
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RDL EZ-HK1 overview

  • 1Description

The RDL EZ-HK1 Stereo Audio Hum Killer is a stereo audio transformer isolation module. It's designed specifically for use with unbalanced, high-impedance audio inputs. The device features both input and output connections on gold-plated RCA jacks. Each input jack is electrically isolated from the case itself, as well as from the output ground. Each output jack is connected to the rear-panel ground-lift switch, which is designed to eliminate hum due to ground loops. Ground loops are common when the EZ-HK1 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.

Key Features

Stereo Audio Inputs
Connect the output from an audio source to the RCA jacks or to the stereo mini-jack
Stereo Audio Outputs
Connect one of the EZ-HK1 outputs to the amplifier or system audio input
Ground-Lift Switch
The audio output cable shields are connected to the EZ-HK1 chassis when the switch is in the NORM position. In the unlikely event that the EZ-HK1 chassis is mounted to equipment with a different ground from the equipment the EZ-HK1 output is feeding, a ground loop could be produced. This ground loop is eliminated by setting the switch to the LIFT position


Audio ground-loop hum elimination
Conversion between mini-jack and RCA formats
Unbalanced stereo galvanic isolation
Portable use or permanent installation
UPC: 813721010643
In the Box
RDL EZ-HK1 Stereo Audio Hum Killer
  • 4 x Rubber Feet
  • Set of Mounting Screws
  • 3-Year Warranty
  • Table of Contents
    • 1Description

    RDL EZ-HK1 specs

    Inputs Stereo RCA Phono Jacks / Stereo Mini Jack (-10 dBV nominal, ground-isolated)
    Input Impedance 10 kohms
    Outputs Stereo RCA Phono Jacks / Stereo Mini Jack (-10 dBV nominal)
    Output Impedance 10 kohms
    Output Isolation Switch-Selectable
    Gain Unity Nominal (passive circuit)
    Frequency Response 20Hz - 20kHz (±1.0dB)
    Total Harmonic Distortion (THD) <0.05% (1.0kHz)
    Crosstalk <-75dB (20Hz - 10kHz) / <-65dB (10 - 20kHz)
    Mounting Size 1/6 rack width
    Dimensions (WxD) 2.9 x 3.0" (7.4 x 7.6 cm)
    Weight Not specified by manufacturer
    Packaging Infobedfaftucudb
    Package Weight 0.45 lb
    Box Dimensions (LxWxH) 4.9 x 4.3 x 2.3"

    RDL EZ-HK1 reviews

    EZ-HK1 Stereo Audio Hum Killer is rated 4.8 out of 5 by 6.
    Rated 5 out of 5 by from Excellent -- worked when other options failed I was having an issue with a hum/buzz when connecting the camera-out of my Tascam DR-701D recorder to the mic-in of my Panasonic GH4 camera, while syncing both devices via HDMI. I tried a variety of ways to track down and isolate the problem, including a couple of other hum eliminators, but nothing consistently worked. The EZ-HK1, connected between the devices via its stereo mini jacks, solved the problem perfectly. I was also impressed by the overall build quality -- unlike so much stuff these days that's cheaply made, this is a solid, well-designed product that feels like it's going to last. It doesn't have XLR or 1/4 connections (I have other options for those) but for mini-jacks or RCA, it's excellent.
    Date published: 2017-03-10
    Rated 4 out of 5 by from Works Well This definitely solved my hum issue and appears to do so without any degradation of sound quality. Downside is that it is a bit expensive and also you need more than 1 if you have home theater. I had to purchase 2, which covered L,R and center channels. But it does appear to be a well made product that will function well for a long time.
    Date published: 2017-09-19
    Rated 5 out of 5 by from Hum Killed! Works exactly as promised. In our theatre sound system (anchored by a Yamaha CL-1 digital mixing console) sound from any laptop source (we tried three) would be clear until the laptop was also connected to the Barco projector. Once connected, an audible 60Hz hum would be created. It didn't matter if the projector was connected by VGA or HDMI cable, and running the laptop on battery instead of AC also made no difference. Hum Killer to the rescue. Problem solved.
    Date published: 2015-09-16
    Rated 5 out of 5 by from Magic I had an awful hum coming from a newly built PC. Research brought me to B&H for this purchase. I installed it in a few minutes, booted the PC, hum gone. Amazing, actually. This unit is Plug and Play. Worth every penny.
    Date published: 2016-08-03
    Rated 5 out of 5 by from Great product, easy to install Upon installation the hum was gone completely. Just plug it in and it is working, no external power needed.
    Date published: 2014-11-05
    Rated 5 out of 5 by from Great Product! Nicely built and works great! Got rid of the ground loop in my audio system.
    Date published: 2014-12-29
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