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HM-54 Important Safety Instructions 1. Read these instructions. 13. Unplug this apparatus during lightning storms or when unused for long periods of time. 2. Keep these instructions. 14. Refer all servicing to qualified service personnel.
Introduction.................................................................................................................................4 Getting Started ........................................................................................................................... 5 Zero the Controls ....................................................................................................................................................................5 Connections................................
HM-54 Introduction Thank you for choosing a Mackie HM-54 Four-Channel Headphone Amplifier. This 1U rackmount unit features left and right TRS main inputs, as well as left and right TRS “direct inputs” on each of the four channels. The front panel provides an input select switch for each channel, allowing you to choose between the main stereo mix or the stereo “direct input.
READ THIS PAGE!! Even if you’re one of those people who never reads manuals, all we ask is that you read this page now before you begin using the HM-54. You’ll be glad you did! 4. With music going through the main mix, don the headphones for headphone amp 1 and S-L-O-W-L-Y turn up the LEVEL control on the front panel for the corresponding headphone amp. Adjust for a comfortable listening level.
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HM-54 HM-54 Features Front Panel All four headphone amplifiers share the same features: • • • • Dual-sources for each channel Individual front panel level controls Front and rear panel phone outputs for each channel Balanced inputs 1. MAIN INPUT LEVEL This adjusts the main mix input signal level coming into the HM-54 LINE INPUT and PHONES INPUT jacks on the rear panel. 2. PHONES Jack Plug your headphones into this jack. It carries the same signals that appear on the rear panel PHONES OUTPUT jacks [8].
. LEFT and RIGHT MAIN INPUT The rear panel is where you make all your analog audio connections to the HM-54 (except for the convenient additional headphone jacks on the front). These 1/4" TRS jacks accept a balanced or unbalanced line-level input signal. This is the signal that you select when you leave the SOURCE select switch [3] on the front panel in the out position, so connect the main mix output from the mixer to these inputs. 6. IEC Power Receptacle This is a standard 3-prong IEC power connector.
HM-54 Appendix A: Service Information Warranty Service Details concerning Warranty Service are spelled out in the Warranty section on page 15. If you think your HM-54 has a problem, please do everything you can to confirm it before calling for service. Doing so might save you from the deprivation of your headphone amp and the associated suffering.
Service for Mackie products is available at a factoryauthorized service center. Service for Mackie products living outside the United States can be obtained through local dealers or distributors. If your HM-54 needs service, follow these instructions: 1. Review the preceding troubleshooting suggestions. Please. 2. Call Tech Support at 1-800-898-3211, 7 am to 5 pm PST, to explain the problem and obtain a Service Request Number. Have your HM-54’s serial number ready.
HM-54 Appendix B: Connections 1/4" TRS Phone Plugs and Jacks Unbalancing a Line “TRS” stands for Tip-Ring-Sleeve, the three connection points available on a stereo 1/4" or balanced phone jack or plug. TRS jacks and plugs are used for balanced signals and stereo headphones. Balanced Mono RING SLEEVE SLEEVE In most studio, stage, and sound reinforcement situations, there is a combination of balanced and unbalanced inputs and outputs on the various pieces of equipment.
HM-54 Specifications Frequency Response AC Power Requirements Main Input to any Output (Level @ 12 o’clock): Power Consumption: 12 watts U.S. and Canada: 120 VAC, 50/60 Hz AC Connector: 3-pin IEC 250 VAC +0, –1 dB, 20 Hz to 20 kHz Distortion (THD & IMD) Physical Dimensions and Weight Main Input to any Output (@ +4 dBu output): THD+N: < 0.01%, 20 Hz to 20 kHz BW, 1 kHz input @ +4 dBu, Level @ 12 o’clock Height: Width: 1.75 in/44 mm 17.0 in/432 mm (main body of unit) 19.0 in/483 mm (with rack ears) 5.
HM-54 Right Phones 2 Input Left Right Phones 1 Input Left Right Main Line Input Left Phones Input - + - + - + - + - + - + MAIN DIRECT MAIN DIRECT Main Input Level Phones Level Phones Level Phones 2 Rear Phones 2 Front Phones 1 Rear Phones 1 Front Right Phones 4 Input Left Right Phones 3 Input Left - + - + - + - + MAIN DIRECT MAIN DIRECT Phones Level Phones Level HM-54 Phones 4 Rear Phones 4 Front Phones 3 Rear Phones 3 Front HM-54 Block Diagram
Please keep your sales receipt in a safe place. A. LOUD Technologies Inc. warrants all materials, workmanship and proper operation of this product for a period of one year from the original date of purchase. If any defects are found in the materials or workmanship or if the product fails to function properly during the applicable warranty period, LOUD Technologies, at its option, will repair or replace the product. This warranty applies only to equipment sold and delivered within the U.S.
220 Wood-Red Road NE • Woodinville, WA 98072 • USA United States and Canada: 800.898.3211 Europe, Asia, Central and South America: 425.487.4333 Middle East and Africa: 31.20.654.4000 Fax: 425.487.4337 • www.mackie.com E-mail: sales@mackie.