Nilfisk HPA6 User Manual
User's Manual
HPA6
6-Channel HEADPHONE AMPLIFIER
R
LTO
www.altoproaudio.com
Version 2.0 Dec. 2002
English
SAFETY RELATED SYMBOLS
CAUTION
RISK OFELECTRIC SHOCK
DO NOTOPEN
This symbol, wherever used, alerts you to the presence of un-insulated and dangerous voltages within the product enclosure. These are voltages that
may be sufficient to constitute the risk of electric
shock or death.
This symbol, wherever used, alerts you to important operating and maintenance instructions.
Please read.
Protective Ground Terminal
AC mains (Alternating Current)
Hazardous Live Terminal
ON: Denotes the product is turned on.
OFF: Denotes the product is turned off.
WARNING
Describes precautions that should be observed to
prevent the possibility of death or injury to the user.
the recommended fuse type as indicated in this
manual. Do not short-circuit the fuse holder. Before
replacing the fuse, make sure that the product is
OFF and disconnected from the AC outlet.
Protective Ground
Before turning the product ON, make sure that it is
connected to Ground. This is to prevent the risk of
electric shock.
Never cut internal or external Ground wires. Likewise,
never remove Ground wiring from the Protective
Ground Terminal.
Operating Conditions
Always install in accordance with the manufacturer's
instructions.
To avoid the risk of electric shock and damage, do
not subject this product to any liquid/rain or moisture.
Do not use this product when in close proximity to
water.
Do not install this product near any direct heat source.
Do not block areas of ventilation. Failure to do so
could result in fire.
Keep product away from naked flames.
CAUTION
Describes precautions that should be observed to
prevent damage to the product.
WARNING
Power Supply
Ensure that the mains source voltage (AC outlet)
matches the voltage rating of the product. Failure
to do so could result in damage to the product and
possibly the user.
Unplug the product before electrical storms occur
and when unused for long periods of time to reduce
the risk of electric shock or fire.
External Connection
Always use proper ready-made insulated mains
cabling (power cord). Failure to do so could result
in shock/death or fire. If in doubt, seek advice from
a registered electrician.
Do Not Remove Any Covers
Within the product are areas where high voltages
may present. To reduce the risk of electric shock do
not remove any covers unless the AC mains power
cord is removed.
Covers should be removed by qualified service
personnel only.
No user serviceable parts inside.
Fuse
To prevent fire and damage to the product, use only
IMPORTANT SAFETY INSTRUCTIONS
Read these instructions
Follow all instructions
Keep these instructions. Do not discard.
Heed all warnings.
Only use attachments/accessories specified by the
manufacturer.
Power Cord and Plug
Do not tamper with the power cord or plug. These are
designed for your safety.
Do not remove Ground connections!
If the plug does not fit your AC outlet seek advice from
a qualified electrician.
Protect the power cord and plug from any physical
stress to avoid risk of electric shock.
Do not place heavy objects on the power cord. This
could cause electric shock or fire.
Cleaning
When required, either blow off dust from the product
or use a dry cloth.
Do not use any solvents such as Benzol or Alcohol.
For safety, keep product clean and free from dust.
Servicing
Refer all servicing to qualified service personnel only.
Do not perform any servicing other than those instructions contained within the User's Manual.
1
PREFACE
Dear Customer:
Thanks for choosing LTO HPA6 6-Channel Headphone Amplifier and thanks for choosing the one of results of
LTO AUDIO TEAM job and researches.
For our LTO AUDIO TEAM, music and sound are more than a job...are first of all passion and let us say...our
obsession!
We have been designing professional audio products for a long time in cooperation with some of the major brands
in the world in the audio field.
The LTO line presents unparalleled analogue and digital products made by Musicians for Musicians in our R&D
Centres in Italy, Netherlands, United Kingdom and Taiwan. The core of our digital audio products is a sophisticated
DSP (Digital sound processor) and a large range of state of the art algorithms which have been developed by our
Software Team for the last 7 years.
Because we are convinced you are the most important member of LTO AUDIO TEAM and the one confirming the
quality of our job, we'd like to share with you our work and our dreams, pay attention to your suggestions and your
comments.
Following this idea we create our products and we will create the new ones! From our side, we guarantee you and
we will guarantee you also in future the best quality, the best fruits of our continuous researches and the best prices.
Our HPA6 6-Channel Headphone Amplifier is the result of many hours of listening and tests involving commonLTO
people, area experts, musicians and technicians.
The result of this effort is a versatile Headphone Amplifier featuring 6 separated channels, each channel provides
3 push-button switches, 2 knob controls, 2 phone jacks and 4 LEDs. The common main section contains 1knob
control, 1 jack and 8 LEDs.
Nothing else to add, but that we would like to thank all the people that made the LTO HPA6 6-Channel
Amplifier a reality available to our customers, and thank our designers and all the LTO staff,
the realization of products containing our idea of music and sound and there to
best way, conscious that you are our best richness.
Thank you very much.
LTO AUDIO TEAM
support you, our customers, in the
there to make possible
Headphone
2
TABLE OF CONTENTS
1. INTRODUCTION .....................................................................................................................................4
2. FEATURE LIST .......................................................................................................................................4
3. CONTROL ELEMENTS ..........................................................................................................................4
3.1 The Front Panel
3.2 The Rear Panel
4. INSTALLATION & CONNECTION ........................................................................................................7
4.1 Mains Connection
4.2 Audio Connection
a. Wiring Configuration
b. In Line Connection
4.3 Rack Mounting
5. APPLICATION.........................................................................................................................................8
5.1 Use the HPA6 as a Headphone Amplifier
5.2 Use the HPA6 as Independent Power Amplifiers
5.3 The HPA6 in Studio Application
5.4 The HPA6 in Mono/Stereo Application
6. TECHNICAL SPECIFICATIONS ..........................................................................................................11
7. WARRANTY .........................................................................................................................................12
3
1. INTRODUCTION
Thank you very much for expressing your confidence in LTO products by purchasing our HPA6 6-Channel Headphone Amplifier. With the HPA6 you have acquired an extremely musical and flexible 6-Channel Headphone Amplifier.
Featuring six stereo headphone amplifiers, The LTO HPA6 6-Channel Headphone Amplifier performs a number of
necessary tasks, not all of which are headphone related.
The HPA6 6-Channel Headphone Amplifier provides Main Inputs on the rear panel and Direct In Input on the front
panel to drive any or all of the 6 stereo headphone amplifiers, when using the Direct In Input, the Main Inputs signal
will be interrupted automatically, the Main Outputs on the rear panel can be used to interlink any number of HPA6s
for expanding. The AUX In input on each channel is used to add an additional input signal to the master signal, with
the corresponding Balanced Control to determine the mix ratio between the two signals.
In parallel with the Headphone Outputs on the rear panel, the Headphone Output on the front panel is also used to
output the signal of the individual channel.
2. FEATURE LIST
Signal Rack Unit
6 individual channels
Common input gain control, and individual output gain control
Up to 3 headphone outputs per channel
Direct In and Headphone Output on the front panel for easy operation, esp. used in the rack mounting application
Input and Output Level Meter
Balance Control to mix up the Main In and the Aux In signal
Main Outputs for chaining further HPA6 headphone amplifiers
Maximum audio quality even at high volume levels
Exceptionally rugged construction ensures long life and durability
Universal and professional headphone amplification system for studio and stage application
Manufactured under QS9000 certified quality system
3. CONTROL ELEMENTS
LTO
24 18 12 60 6 12 18
R
INPUTLEVEL(dBu)
DIRECTIN
MAINSECTION
1
2
0
INPUTGAIN
3
4
5
6
OUTPUTLEVEL(dBu)
24 0 12
L MUTE R
MONO
STEREO
CLIP
MAININ
CHANNEL1
2
1
0
AUX
BALANCED
OUTPUTGAIN
AUXIN HEADPHONE OUT
3
6
OUTPUTLEVEL(dBu)
4
24 0 12
5
L MUTE R
MONO
STEREO
CLIP
MAININ
AUX
BALANCED
AUXIN HEADPHONE OUT
CHANNEL2
2
1
OUTPUTGAIN
3
OUTPUTLEVEL(dBu)
4
24 0 12
CLIP
L MUTE R
5
6
0
MONO
STEREO
MAININ
BALANCED
CHANNEL3
3
OUTPUTLEVEL(dBu)
2
4
24 0 12
CLIP
L MUTE R
5
1
6
AUX
0
OUTPUTGAIN
AUXIN
MONO
STEREO
Excluding 1 knob control, 1 jack and 8 LEDs for the common main section, the LTO HPA6 6-Channel Headphone
Amplifier also contains 3 Push-button switches, 2 knob controls, 2 phone jacks and 4 LEDs for each individual channel.
BALANCED
CHANNEL4
3
OUTPUTLEVEL(dBu)
2
4
24 0 12
CLIP
L MUTE R L MUTE R
5
1
6
AUX
0
OUTPUTGAIN
AUXIN
MONO
STEREO
BALANCED
AUXIN
CHANNEL5
3
OUTPUTLEVEL(dBu)
2
4
24 0 12
CLIP
5
1
6
AUX
0
OUTPUTGAIN
MONO
STEREO
1
AUX
BALANCED
AUXINHEADPHONEOUT HEADPHONEOUT HEADPHONEOUT HEADPHONEOUT
CHANNEL6
2
0
OUTPUTGAIN
3
4
5
6
POWER
3.1 The ront anelFP
ON
OFF
HPA6
6-Channel
HEADPHONE
AMPLIFIER
LTO
24 18 12 60 6 12 18
R
DIRECT IN
3
INPUT LEVEL(dBu)
2
1
0
INPUT GAIN
MAIN SECTION
1
3
6
2
5
OUTPUT LEVEL(dBu)
24 0 12
L MUTE R
4
5
8
4
12
CLIP
MONO
STEREO
7
MAIN IN
6 10
AUX
BALANCED
AUX IN
CHANNEL 1
4
11
3
2
1
0
OUTPUT GAIN
HEADPHONE OUT
9
4
5
6
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