O W N E R ’ S M A N U A L
POWER
PHONES 4 |
PHONES 3 |
PHONES 2 |
PHONES 1 |
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INPUT |
1 |
2 |
3 |
4 |
+12V DC |
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HM-4 4-Way Headphone Amplifier
Important Safety Instructions
1.Read these instructions.
2.Keep these instructions.
3.Heed all warnings.
4.Follow all instructions.
5.Do not use this apparatus near water.
6.Clean only with a dry cloth.
7.Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.
8.Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
9.Only use attachments/accessories specified by the manufacturer.
10.Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
11.This apparatus shall not be exposed to dripping or splashing, and no object filled with liquids, such as vases or beer glasses, shall be placed on the apparatus.
12.This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation.
If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
•Reorient or relocate the receiving antenna.
•Increase the separation between the equipment and the receiver.
•Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
•Consult the dealer or an experienced radio / TV technician for help.
CAUTION: Changes or modifications to this device not expressly approved by LOUD Audio LLC could void the user's authority to operate the equipment under FCC rules.
WARNING — To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture.
13.This device complies with FCC radiation exposure limits set forth for an uncontrolled environment. This device should be installed and operated with minimum distance 20cm between the radiator & your body.
14.This apparatus does not exceed the Class A/Class B (whichever is applicable) limits for radio noise emissions from digital apparatus as set out in the radio interference regulations of the Canadian Department of Communications.
ATTENTION — Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant las limites applicables aux appareils numériques de class A/de class B (selon le cas) prescrites dans le réglement sur le brouillage radioélectrique édicté par les ministere des communications du Canada.
15.This device complies with Industry Canada licence-exempt RSS standard(s).
Operation is subject to the following two conditions:
(1)this device may not cause interference, and
(2)this device must accept any interference, including interference that may cause undesired operation of the device.
Le présent appareil est conforme aux CNR d’Industrie Canada applicables aux appareils radio exempts de licence. L’exploitation est autorisée aux deux conditions suivantes:
(1)l’appareil ne doit pas produire de brouillage, et
(2)l’utilisateur de l’appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d’en compromettre le fonctionnement.
16.Exposure to extremely high noise levels may cause permanent hearing loss. Individuals vary considerably in susceptibility to noise-induced hearing loss, but nearly everyone will lose some hearing if exposed to sufficiently intense noise for a period of time. The U.S. Government’s Occupational Safety and Health Administration (OSHA) has specified the permissible noise level exposures shown in the following chart.
According to OSHA, any exposure in excess of these permissible limits could result in some hearing loss. To ensure against potentially dangerous exposure to high sound pressure levels, it is recommended that all persons exposed to equipment capable of producing high sound pressure levels use hearing protectors while the equipment is in operation. Ear plugs or protectors in the ear canals or over the ears must be worn when operating the equipment in order to prevent
permanent hearing loss if exposure is in excess of the limits set forth here:
Duration, per |
Sound Level dBA, |
Typical Example |
day in hours |
Slow Response |
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8 |
90 |
Duo in small club |
6 |
92 |
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4 |
95 |
Subway Train |
3 |
97 |
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2 |
100 |
Very loud classical music |
1.5 |
102 |
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1 |
105 |
Ryan screaming at Troy about deadlines |
0.5 |
110 |
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0.25 or less |
115 |
Loudest parts at a rock concert |
Correct disposal of this product: This symbol indicates that this product should not be disposed of with your household waste, according to the WEEE directive (2012/19/EU) and your national law. This product should be handed over to an authorized collection site for recycling waste electrical and electronic equipment (EEE). Improper handling of this type of waste could have a possible negative impact on the environment and human health due to potentially hazardous substances that are generally associated with EEE. At the same time, your cooperation in the correct disposal of this product
will contribute to the effective usage of natural resources. For more information about where you can drop off your waste equipment for recycling, please contact your local city office, waste authority, or your household waste disposal service.
2 |
HM-4 4-Way Headphone Amplifier |
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.
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.
Manual Owner’s
Part No. SW1226 Rev. A 01/18
©2018 LOUD Audio, LLC All Rights Reserved.
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