Millenium HP4 User manual

HP4
Headphone Amplier
User Manual

Thomann GmbH
Hans-Thomann-Straße 1
96138 Burgebrach
Germany
Telephone: [phone]
Internet: www.thomann.de
27.02.2024, ID: 234787 (V4)

Table of contents
1 General information................................................................................................................................. 5
1.1 Symbols and signal words............................................................................................................... 5
2 Safety instructions..................................................................................................................................... 7
3 Features....................................................................................................................................................... 10
4 Installation and starting up................................................................................................................ 11
5 Connections and controls................................................................................................................... 12
6 Functions..................................................................................................................................................... 14
7 Technical specications....................................................................................................................... 15
8 Plug and connection assignment.................................................................................................... 17
9 Protecting the environment.............................................................................................................. 19
Table of contents
HP4 3
Headphone Amplier

4HP4
Headphone Amplier

1 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.
1.1 Symbols and signal words
In this section you will nd an overview of the meaning of symbols and signal words that are
used in this document.
General information
HP4 5
Headphone Amplier

Signal word Meaning
DANGER! This combination of symbol and signal word indicates an
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 pos‐
sible dangerous situation that can result in death or serious
injury if it is not avoided.
NOTICE! This combination of symbol and signal word indicates a pos‐
sible dangerous situation that can result in material and
environmental damage if it is not avoided.
Warning signs Type of danger
Warning – high-voltage.
Warning – danger zone.
General information
6HP4
Headphone Amplier

2 Safety instructions
This device is intended to be used for amplication and distribution of signals from audio
devices and musical instruments to the connected headphones and audio devices. Use the
device only as described in this user manual. Any other use or use under other operating con‐
ditions 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 sucient 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 suocate 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.
Intended use
Safety instructions
HP4 7
Headphone Amplier

DANGER!
Danger to life due to electric current!
A short circuit could lead to a re hazard and risk of death. Always use proper ready-made insulated triple-core mains cable with a
safety plug. Do not modify the mains cable or the plug. In case of isolation damage, disconnect immediately the power supply and
arrange repair. If in doubt, seek advice from a qualied electrician.
WARNING!
Possible hearing damage due to high volumes on speakers or headphones!
With speakers or headphones connected, the device can produce volume levels that may cause temporary or permanent hearing
impairment. Over an extended period of time, even levels that seem to be uncritical can cause hearing damage. Do not operate the
device permanently at a high volume level. Decrease the volume level immediately if you experience ringing in your ears or hearing
impairment.
NOTICE!
Risk of re due to covered vents and neighbouring heat sources!
If the vents of the device are covered or the device is operated in the immediate vicinity of other heat sources, the device can over‐
heat and burst into ames. Never cover the device or the vents. Do not install the device in the immediate vicinity of other heat
sources. Never operate the device in the immediate vicinity of naked ames.
NOTICE!
Damage to the device if operated in unsuitable ambient conditions!
The device can be damaged if it is operated in unsuitable ambient conditions. Only operate the device indoors within the ambient
conditions specied in the “Technical specications” chapter of this user manual. Avoid operating it in environments with direct sun‐
light, heavy dirt and strong vibrations. Avoid operating it in environments with strong temperature uctuations. If temperature uc‐
tuations cannot be avoided (for example after transport in low outside temperatures), do not switch on the device immediately.
Never subject the device to liquids or moisture. Never move the device to another location while it is in operation. In environments
with increased dirt levels (for example due to dust, smoke, nicotine or mist): Have the device cleaned by qualied specialists at reg‐
ular intervals to prevent damage due to overheating and other malfunctions.
Safety instructions
8HP4
Headphone Amplier

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 vol‐
tages can also cause a risk of injury and res. Make sure that the voltage specication 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 plasticiser in rubber feet!
The plasticiser contained in the rubber feet of this product may react with the coating of the oor 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 oor.
Safety instructions
HP4 9
Headphone Amplier

3 Features
nExcellent sound quality
nFlexible switching matrix
nFour independent stereo inputs with unbalanced jack sockets
nFour signal outputs, each with line and headphone jack and individual volume control
nLow-noise linear operational amplier for transparent sound with maximum headroom at
high output levels
nIntegrated shielded double-regulated power supply
nInstallation in 19-inch racks (1 RU)
Features
10 HP4
Headphone Amplier

4 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 o. Use the shortest possible high-quality cables for
all connections. Take care when running the cables to prevent tripping hazards.
The unit has been designed for rack mounting in a standard 19-inch rack; it occupies one rack
unit.
Rack mounting
Installation and starting up
HP4 11
Headphone Amplier

5 Connections and controls
0 10
VOLUME
PHONE LINE
12
3
4
OFF
INPUT
SOURCE
1
0 10
VOLUME
PHONE LINE
12
3
4
OFF
INPUT
SOURCE
2
0 10
VOLUME
PHONE LINE
12
3
4
OFF
INPUT
SOURCE
3
0 10
VOLUME
PHONE LINE
12
3
4
OFF
INPUT
SOURCE
4
POWER
HP4
4 Channel
Headphone Amplifier
ö
# $ %
ö
# $ %
ö
# $ %
ö
# $ %
&
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.
Front panel
Connections and controls
12 HP4
Headphone Amplier

115V~ 230V~
POWER INPUT:
110/230V~ 50/60Hz
ON
OFF
1
LEFT (MONO) RIGHT
2
LEFT (MONO) RIGHT
3
LEFT (MONO) RIGHT
4
LEFT (MONO) RIGHT
FUSE:
F0.5AL250V, 230V~
F1.0AL250V, 115V~
INPUTS
' ( ) *+
6 Rubber panel plug with fuse holder for the power supply
7 Selector switch for the supply voltage of the device (115 V or 230 V, factory-set default setting).
8[ON | OFF] | Mains switch for turning the device on and o.
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.
Rear panel
Connections and controls
HP4 13
Headphone Amplier

6 Functions
The device amplies 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 exible switching matrix allows the inputs and outputs of the four channels to
be interconnected or muted using the [INPUT SOURCE] rotary switch. The channel-specic
volume can be regulated within a range from 0 to 10 with a separate volume control.
Functions
14 HP4
Headphone Amplier

7 Technical specications
Input connections Power supply C14 rubber panel plug
Audio signal 4 × 6.35-mm jack sockets
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)
Technical specications
HP4 15
Headphone Amplier

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)
Technical specications
16 HP4
Headphone Amplier

8 Plug and connection assignment
This chapter will help you select the right cables and plugs to connect your valuable equip‐
ment in such a way that a perfect sound experience is ensured.
Please note these advices, because especially in ‘Sound & Light’ caution is indicated: Even if a
plug ts into the socket, an incorrect connection may result in a destroyed power amp, a short
circuit or ‘just’ in poor transmission quality!
Unbalanced transmission is mainly used in semi-professional environment and in hi 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 trans‐
mitted 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 conduc‐
tors ‘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 aects both cores equally, by subtracting the phase-shifted signals, the
interfering signal is completely neutralized. The result is a pure signal without any noise inter‐
ference.
Introduction
Balanced and unbalanced trans‐
mission
Plug and connection assignment
HP4 17
Headphone Amplier

1 Signal
2 Ground, shielding
1 Signal (left)
2 Signal (right)
3 Ground
1/4" TS phone plug (mono,
unbalanced)
1/4" TRS phone plug (stereo,
unbalanced)
Plug and connection assignment
18 HP4
Headphone Amplier

9 Protecting the environment
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 in the
proper manner.
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 the packing material
Protecting the environment
HP4 19
Headphone Amplier

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 rm 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 those data before disposing of it.
Disposal of your old device
Protecting the environment
20 HP4
Headphone Amplier