Millenium HP4 Headphone Amplifier User Manual

Millenium HP4 Headphone Amplifier

Specifications

• Date: 27.02.2024
• ID: 234787 (V4)
• Intended Use: Amplification and distribution of signals from audio devices and musical instruments to connected headphones and audio devices
• Safety: High voltages present, do not remove covers, use proper insulated mains cable
• Hearing Protection: Warning about possible hearing damage due to high volumes

Product Usage Instructions

Safety Instructions

• Intended Use: This device is intended for amplification and distribution of signals from audio devices and musical instruments to connected headphones and audio devices. Use only as described in the user manual to avoid personal injury or property damage.
• Safety: Avoid risks of injury by ensuring only persons with sufficient abilities and knowledge use the device. Do not modify the device, remove covers, or operate it under improper conditions.
• Danger to Life Due to Electric Current: High voltages may be present inside the device. Do not remove covers or attempt repairs yourself. Use proper insulated mains cable and seek advice from a qualified electrician if needed.
• Hearing Protection: Be cautious of high volume levels that can cause hearing damage. Avoid operating the device at high volumes for extended periods to prevent hearing impairment.

General information

• This document contains important instructions for the safe operation of the product. Read and follow the safety instructions and all other instructions. Keep the document for future refer‐ ence. Make sure that it is available to all those using the product. If you sell the product to another user, be sure that they also receive this document.
• Our products and documentation are subject to a process of continuous development. They are therefore subject to change. Please refer to the latest version of the documentation, which is ready for download under www.thomann.de.

Symbols and signal words
In this section you will find an overview of the meaning of symbols and signal words that are used in this document.

immediate dangerous situation that will result in death or serious injury if it is not avoided.
WARNING!| This combination of symbol and signal word indicates a possible dangerous situation that can result in death or serious injury if it is not avoided.
NOTICE!| This combination of symbol and signal words indicates a possible dangerous situation that can result in material and environmental damage if it is not avoided.
 |
Warning signs| Type of danger
CAUTION| Warning – high-voltage.
WARNING| Warning – danger zone.

Safety instructions

Intended use
This device is intended to be used for amplification and distribution of signals from audio devices and musical instruments to connected headphones and audio devices. Use the device only as described in this user manual. Any other use or use under other operating conditions is considered to be improper and may result in personal injury or property damage. No liability will be assumed for damages resulting from improper use.

This device may be used only by persons with sufficient physical, sensorial, and intellectual abilities and having corresponding knowledge and experience. Other persons may use this device only if they are supervised or instructed by a person who is responsible for their safety.

Safety

DANGER

• Risk of injury and choking hazard for children!
• Children can suffocate on packaging material and small parts. Children can injure themselves when handling the device. Never allow children to play with the packaging material and the device. Always store packaging material out of the reach of babies and small children. Always dispose of packaging material properly when it is not in use. Never allow children to use the device without supervi‐sion. Keep small parts away from children and make sure that the device does not shed any small parts (such knobs) that children could play with.

DANGER

• Danger to life due to electric current!
• Within the device, there are areas where high voltages may be present. Never remove any covers. There are no user-serviceable parts inside. Do not use the device when covers, safety equipment, or optical components are missing or damaged.

DANGER

• Risk of injury and choking hazard for children!
• Children can suffocate on packaging material and small parts. Children can injure themselves when handling the device. Never allow children to play with the packaging material and the device. Always store packaging material out of the reach of babies and small children. Always dispose of packaging material properly when it is not in use. Never allow children to use the device without supervi‐sion. Keep small parts away from children and make sure that the device does not shed any small parts (such knobs) that children could play with.

DANGER

• Danger to life due to electric current!
• Within the device, there are areas where high voltages may be present. Never remove any covers. There are no user-serviceable parts inside. Do not use the device when covers, safety equipment, or optical components are missing or damaged.

NOTICE

• Damage to the device due to high voltages!
• The device can be damaged if it is operated with the incorrect voltage or if high voltage peaks occur. In the worst case, excess voltages can also cause a risk of injury and fires. Make sure that the voltage specification on the device matches the local power grid before plugging in the device. Only operate the device from professionally installed mains sockets that are protected by a residual current circuit breaker (FI). As a precaution, disconnect the device from the power grid when storms are approaching or it the device will not be used for a longer period.

NOTICE

• Possible staining due to plasticizer in rubber feet!
• The plasticizer contained in the rubber feet of this product may react with the coating of the floor and cause permanent dark stains after some time. If necessary, use a suitable mat or felt slide to prevent direct contact between the device’s rubber feet and the floor.

Features

• Excellent sound quality
• Flexible switching matrix
• Four independent stereo inputs with unbalanced jack sockets
• Four signal outputs, each with a line and headphone jack and individual volume control
• Low-noise linear operational amplifier for transparent sound with maximum headroom at high output levels
• Integrated shielded double-regulated power supply
• Installation in 19-inch racks (1 RU)

Installation and starting up

Unpack and check carefully there is no transportation damage before using the unit. Keep the equipment packaging. To fully protect the product against vibration, dust and moisture during transportation or storage use the original packaging or your own packaging material suitable for transport or storage, respectively.

Create all connections while the device is off. Use the shortest possible high-quality cables for all connections. Take care when running the cables to prevent tripping hazards.
Rack mounting: The unit has been designed for rack mounting in a standard 19-inch rack; it occupies one rack unit.

Connections and controls

Front panel

1| [VOLUME] | Volume control for the built-in speakers and headphone outputs
---|---
2| [PHONE] | Headphone outputs (6.35-mm jack sockets, stereo)
3| [LINE] | Line outputs (6.35-mm jack sockets, stereo) for looping through the input signals to the connected audio equip‐ ment.
4| [INPUT SOURCE] | Rotary switch for allocating the four audio inputs on the back to the line and headphone outputs on the front.
5| [POWER] | LED indicating the operating status. This LED lights up when the device is on.

Rear panel

factory-set default setting).
8| [ON | OFF] | Mains switch for turning the device on and off.
9| [LEFT (MONO)] | Audio inputs (6.35-mm jack socket, unbalanced)

For mono mode, connect the signal source to this input of the respective channel.

For stereo mode, connect the left channel of the signal source to this input of the respective channel.

10| [RIGHT] | Audio inputs (6.35-mm jack socket, unbalanced)

For stereo mode, connect the right channel of the signal source to this input of the respective channel.

Functions

• The device amplifies and distributes up to four input signals in mono or stereo mode to the four integrated output channels. The output signals can be played on up to four headphones and/or be looped to four other audio devices with line level.
• In addition, the flexible switching matrix allows the inputs and outputs of the four channels to be interconnected or muted using the [INPUT SOURCE] rotary switch. The channel-specific volume can be regulated within a range from 0 to 10 with a separate volume control.

Technical specifications

Impedance: 47 kΩ (unbalanced)
Peak-input level: +25 dB

Gain-control range: +35 dB

Output connections| Headphones| 4 × 6.35-mm jack sockets (stereo)
Max. output level: 300mW (RMS), 1 W (peak)
Output impedance 22 Ω
Max. gain: +20 dB
Line| 4 × 6.35-mm jack sockets (unbalanced/parallel)
Frequency range| 20 Hz … 20 kHz (±0.04 dB)
Signal-to-noise ratio| 91 dB (1 kHz, +8 dBu)
Total harmonic distortion (THD)| < 0.00004% (1 kHz, 8dBu)
Distortion| 0.02%
Crosstalk| –80 dB (20 Hz…20 kHz)
Power consumption| 11.5 W
---|---
Supply voltage| 115/230 V     50/60 Hz
Fuse| 115 V: 5 mm× 20 mm, 1 A , 115 V, fast blow

230 V: 5 mm× 20 mm, 0,5 A, 230 V, fast blow

Installation properties| 19 inches, 1 RU
Dimensions (W × H × D)| 482.6 mm × 44.5 mm × 217 mm
Weight| 3.15 kg
Ambient conditions| Temperature range| 0 °C…40 °C
Relative humidity| 20%…80% (non-condensing)

Plug and connection assignment

Introduction

• This chapter will help you select the right cables and plugs to connect your valuable equipment in such a way that a perfect sound experience is ensured.
• Please note this advice, because especially in ‘Sound & Light’ caution is indicated: Even if a plug fits into the socket, an incorrect connection may result in a destroyed power amp, a short circuit or ‘just’ in poor transmission quality!

Balanced and unbalanced transmission

• Unbalanced transmission is mainly used in semi-professional environments and in hi-fi use. Instrument cables with two conductors (one core plus shielding) are typical representatives of the unbalanced transmission. One conductor is ground and shielding while the signal is transmitted through the core.
• Unbalanced transmission is susceptible to electromagnetic interference, especially at low levels, such as microphone signals, and when using long cables.
• In a professional environment, therefore, the balanced transmission is preferred, because this enables an undisturbed transmission of signals over long distances. In addition to the conductors ‘Ground’ and ‘Signal’, in a balanced transmission, a second core is added. This also transfers the signal but phase-shifted by 180°.
• Since the interference affects both cores equally, by subtracting the phase-shifted signals, the interfering signal is completely neutralized. The result is a pure signal without any noise interference.

1/4″ TS phone plug (mono, unbalanced)

1/4″ TRS phone plug (stereo, unbalanced)

Protecting the environment

Disposal of the packing material

• Environmentally friendly materials have been chosen for the packaging. These materials can be sent for normal recycling. Ensure that plastic bags, packaging, etc. are disposed of properly.
• Do not dispose of these materials with your normal household waste, but make sure that they are collected for recycling. Please follow the instructions and markings on the packaging.

Observe the disposal note regarding documentation in France

Disposal of your old device

• This product is subject to the European Waste Electrical and Electronic Equipment Directive (WEEE) as amended.
• Do not dispose of your old device with your normal household waste; instead, deliver it for controlled disposal by an approved waste disposal firm or through your local waste facility.
• When disposing of the device, comply with the rules and regulations that apply in your country. If in doubt, consult your local waste management facility. Proper disposal protects the environment as well as the health of your fellow human beings.
• Also, note that waste avoidance is a valuable contribution to environmental protection.
• Repairing a device or passing it on to another user is an ecologically valuable alternative to disposal.
• You can return your old device to Thomann GmbH at no charge. Check the current conditions on www.thomann.de.
• If your old device contains personal data, delete that data before disposing of it.

FAQ

Frequently Asked Questions

• Q: Can I repair the device myself if there is an issue?
  • A: No, do not attempt to repair the device yourself as there are no user-serviceable parts inside. Seek advice from a qualified electrician for any repairs.
• Q: How should I handle a damaged mains cable or plug?
  • A: In case of isolation damage, disconnect the power supply immediately and arrange for repair. Do not modify the mains cable or plug, and always use a properly insulated triple-core mains cable with a safety plug.

References

• Buy musical instruments online from the market leader – Thomann United States

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