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Contents
Important Safety Instructions ........................................2
Contents ...........................................................................3
Features ............................................................................3
How To Use This Manual .................................................3
Introduction .....................................................................3
Getting Started ................................................................3
Things To Remember .......................................................3
Hookup Diagram ..............................................................4
HM-4: Front and Rear Panel Features ...........................5
1. Power Connector and LED ....................................5
2. 1/4" Line Input .......................................................5
3. 1/4" Headphone Output Jacks .............................5
4. Phones Level Knobs .............................................5
Appendix A: Service Information ....................................6
Appendix B: Technical Information ................................ 7
HM-4 Dimensions ..................................................... 7
HM-4 Block Diagram ................................................8
Limited Warranty .............................................................9
Features
• Share a single stereo source with up to four pairs
of headphones
• Individual level control for each output
• Powered via the included power supply
• Built-Like-A-Tank™ construction
How to Use This Manual
After this introduction, a getting started guide will help you
get things set up fast. The hookup diagram shows a typical
setup.
This icon marks information that is critically
important or unique to the HM-4. For your
own good, read and remember them.
Part No. SW1226 Rev. A 01/18
©2018 LOUD Audio, LLC All Rights Reserved.
Introduction
The ultra-compact HM-4 4-Way Headphone Amplifier
features a 1/4" stereo input and four 1/4" headphone outputs
with individual level controls. Perfect for studios or even at
home when up to four people want to listen together.
Getting Started
The following steps will help you set up the HM-4
4-Way Headphone Amplifier quickly.
1. Turn down all level knobs on all connected gear.
2. Connect a cable from the output jack of the mixer,
computer or other audio device to the input jack
of the HM-4.
3. Connect stereo headphones to the headphone output
jack(s) of the HM-4.
4. Push the AC adapter securely into the HM-4's connector
and plug the other end into an AC outlet. The HM-4 may
accept the appropriate voltage as indicated near the
connector. The HM-4 will turn on automatically when
connected.
5. Be sure that the volume of the input is the same as it
would be during normal use.
6. Slowly raise the phones knob(s) to a comfortable listening
level.
Things to Remember
• Never listen to loud music for prolonged periods.
Please see the Safety Instructions on page 2 for
information on hearing protection.
• Save the shipping boxes and packing materials!
You may need them someday. Besides, your hamster
will love playing in them and jumping out at you
unexpectedly. Remember to pretend like you
are surprised!
• Save your sales receipt in a safe place.
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