IEM-One Manual

IEM-One Manual Wired In Ear Monitor System / Single Channel Headphone Amplifier

Before You Start

  1. Accessing the Battery Compartment: remove the thumb screw to detach the belt clip and access the battery compartment.
  2. Inserting the Batteries: install 2x AAA batteries in the compartment, ensuring the correct polarity as indicated. Batteries will last approximately 10 hours. The battery indicator LED will emit a red light when there is 1 hour or less of power remaining, signaling it’s time to replace the batteries.
  3. Reattaching the Belt Clip: After inserting the batteries, reattach the belt clip and secure it with the thumb screw. Adjust the clip's tension by tightening or slightly loosening the thumb screw.

Getting Started

  1. Connecting the Input Source: Plug your audio source cable into the XLR-1/4” jack of the IEM-One.
  2. Powering On/Off: Turn the volume knob clockwise to power on the device; you will feel a click and see the battery indicator light emit, showing the unit is powered on. To turn off, rotate the volume knob counterclockwise until you feel a click. For hearing safety, ensure earphones are removed before powering on or off.
  3. Adjusting the Volume: Increase the output level by turning the volume knob clockwise after the unit is powered on.
  4. Selecting Stereo or Mono Output: Use the switch button to toggle between stereo and mono outputs; up for mono and down for stereo.


  • Input: XLR-1/4” combo jack
  • Output: 1/8" TRS, stereo
  • Impedance: 0.5Ω
  • Max Output: 2x 100 mW @16Ω