Alto MC250.4 Users Manual
MC250.4
User's Manual
FOUR CHANNELS POWER AMPLIFIER
R
LTO
www.altoproaudio.com
Version 1.0 AUGUST 2005
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.
Fuse
To prevent fire and damage to the product, use only
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.
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.
CAUTION
Describes precautions that should be observed to
prevent damage to the product.
Disposing of this product should not be
placed in municipal waste and should be
Separate collection.
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.
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.
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.
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PREFACE
PREFACE
Thank you for choosing MC250.4 four channels Power Amplifier and thanks for choosing one of the results of LTO
AUDIO TEAM job and research.
For our LTO AUDIO TEAM, music and sound are more than a job... is 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
centers in Italy, Netherlands, United Kingdom and Taiwan. The core of our digital audio products is a sophisticated
Software Team for many years.
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.
Nothing else to add, but that we would like to thank all the people that made the MC250.4 four channels Power
Amplifier and thank our designers and all the LTO staff, people who make possible the realization of products
containing our idea of music and sound and are ready to support you , our customers, in the best way, conscious
that you are our best richness.
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TABLE OF CONTENTS
1. INTRODUC IONT .............................................................................................................................................. .....4
2. FEATURES...................................................................................................................................... .. .............. ..... 4
3. CONTROL ELEMENTS............................................................................................................................... ........5
4.4. INSTALLATION.....................................................................................................................................................INSTALLATION.......................................................................................................................................................7
5. APPLICATION.........................................................................................................................................................8
6.
CAUTION FOR APPLICATION..............................................................................................................................10
7.
BLOCK DIAGRAM.................................................................................................................................................11
8.
TECHNICAL SPECIFICATIONS............................................................................................................................12
9.
WARRANTY...........................................................................................................................................................13
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1. INTRODUCTION
The MC250.4 Four Channels Power Amplifier is designed for professional use and provides unparalleled quality. It
Includes soft start, signal limit, two variable-speed-low-noise fans and a LED meter display. Each channel is equipped
with independent protective circuitry against open circuit, short circuit, mismatched loads and overheat. It includes four
independent channels with separate power supply. Furthermore, every channel has also a main LED that becomes
green for power-on indicator and green for muting or protection, another red LED that shows true amplifier clipping
and a yellow one for the limit stage. The high-quality components and the carefully designed circuits ensure
excellent audio performance and an extremely linear frequency response, giving crystal-clear sound in the high
range and an up-front, full-bodied bottom end. This amplifier guarantees total reliability and a trouble-free use even
in the most demanding conditions. We believe the MC250.4 not only look great, but provide a perfect performance,
what you get is unprecedented performance at an incredibly attractive price.
2. FEATURE
Innovative design and high stability power amplifier
Fan-cooled AB class high power amplifier in 19", 2U size
4 independent channels with separate protection system
DC, infrasonic, overheat & short circuit protection
Smart-designed protection system for auto re-operation after fault
Parallel-input: channel 1 to channel 2, channel 3 to channel 4
Allow selection of Stereo, Bridge or parallel operation
Ultra low-noise and hum
High-pass filter , allow selection of flat, 35 Hz or 75Hz, protect speakers and prevent speaker transformer saturation
with minimal effect on program material.
DIP switch control for clip limit, high-pass filter, bridge-mono selections
AUTO variable- speed-low-noise fans ensure high reliability even under demanding conditions.
Detachable Euroblock: " Barrier strip" input connectors.
Rugged amplifier in a strong, compact chassis
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