ALESIS Matica 900 User Manual
ALESIS
Matica 500/900
Reference Manual
Contents
CONTENTS
1: Introduction .............................................................................3
About Alesis Maticaª Amplifiers.........................................................................3
Why Another Power Amplifier? ............................................................................4
2: Installation ............................................................................... 5
Unpacking and Inspection.......................................................................................5
Physical Installation.............................................................................................5
Electrical Installation............................................................................................6
Audio Installation: Input Wiring............................................................................7
Audio Installation: Output Wiring .........................................................................8
System Setup and Testing .......................................................................................10
3: Amplifier Operation................................................................13
4: In Case Of Trouble..................................................................15
5: Reference................................................................................. 17
Preliminary Amplifier Specifications ....................................................................17
Matica 500/900 Reference Manual 1
2 Matica 500/900 Reference Manual
CHAPTER 1
INTRODUCTION
Introduction
CHANNEL A
CLIP
5
6
4
3
2
1
7
9
100
0
CHANNEL B
POWER
8
CLIP
5
6
4
3
2
1
7
8
9
100
0
Figure 1: Amplifier front panel controls.
About Alesis Maticaª Amplifiers
Thank you for purchasing an Alesis Matica power amplifier, one of the most
advanced and highest value amplifiers available.
Your Alesis High Speed, Wide Bandwidth amplifier provides extremely accurate
sonic quality as well as measured specifications, but its conservative design and
careful attention to electronic protection means that it will continue to operate at
top condition without special attention, year after year.
Matica amplifiers use the newest generation of linear semiconductor devices for
improved performance. Their high slew rate of 80 V/ms insures that they will not
generate significant TIM (transient intermodulation) distortion. The outstanding
signal to noise ratio (typically better than 103 dB, A weighted, below rated output)
and very low harmonic distortion (typically below .009% midband) make them
ideally suited for the most critical studio monitoring applications.
AC
BRKR
These amplifiers, however, are in rugged, roadworthy packages which are of
minimum size consistent with conservative electronic design principles. Their
power transformers have unusually high current capability for their size, thus
insuring both stable power output and minimum interference with adjacent
equipment.
The CoolSyncª (patent pending) transistor cooling dynamically adjusts the rate of
front to back airflow depending on the power density of the program material, thus
anticipating the need for cooling rather than merely reacting to temperature. The
airflow cools all components, not merely the output transistors.
Detented level controls are on the front panel, where they can be easily adjusted if
necessary. Both the power switch and the circuit breaker are on the front panel so
that in case of problems, the breaker can be reset without requiring access to the
rear of the amplifier. Clip lights for each channel indicate the onset of actual
Matica 500/900 Reference Manual 3
Introduction
clipping, not just a designated output voltage which may not correspond to the
clipping point if power line voltage is low.
The rear panel inputs can be via gold plated 1/4" (6.3 mm) phone jacks, gold plated
3 pin XLR-type connectors or barrier screw terminals, all of which are standard
equipment. Outputs are on five-way binding posts which can accept large diameter
wire or 3/4" (19 mm) spaced dual banana plugs. A recessed rear panel switch allows
easy selection of stereo or bridged monaural operating modes. Separate signal and
chassis ground points are available to handle any grounding scheme.
Matica amplifiers have high current output protection relays which disconnect the
output in the event of overtemperature, DC offset, audio signals below 5 Hz on the
output terminals or excessively low line voltage. When AC power is applied to the
amplifier, the relay does not engage immediately; a 4Ð5 second delay allows the
amplifier circuitry to stabilize and prevents turn-on transients from other
equipment powering up during that time from being reproduced by the loudspeakers.
The cooling fan is also momentarily exercised at high speed at turn-on. When AC
power is turned off, the speaker protection relays immediately disconnect, thus
keeping turn-off transients from reaching the speakers. Additional protection
circuitry keeps RFI out of the audio circuits, assuring clean, stable operation in
difficult environmental conditions.
An aLinkª 25-pin connector is provided for future expansion by the user. Among the
planned accessories for attachment to this connector are outboard signal processors,
electronic crossovers and remote controllers. Also planned are an internal module to
allow soft turn-on and remote turn-on/turn-off; the internal module is for
installation by qualified personnel. See your Alesis dealer for information on these
options.
Why Another Power Amplifier?
Professional power amplifiers of today tend to fall into several groups. Those
aimed at the performing musicianÕs sound reinforcement needs are often designed for
the highest possible power output at the lowest possible price. Those intended for
portable sound reinforcement are frequently designed for minimum weight and size,
while fixed reinforcement amplifiers are often made to fit a laundry list of
requirements.
In all too many of these situations, the sonic character of the amplifier is low on
the list of design priorities. A professional amplifier must be reliable under all
circumstances, of course, because peopleÕs livelihoods and even their safety can
depend on its proper operation. And yet, the primary purpose of any audio
amplifier is reproducing sound with as high quality as possible.
The new Alesis amplifiers meet the stringent requirements of both fixed and touring
sound reinforcement, but they do not sacrifice sonic excellence to achieve their
professional credentials. Highly sophisticated engineering which takes advantage
4 Matica 500/900 Reference Manual
Introduction
of recent developments in electronic componentry, and innovative design concepts
make the Alesis power amplifiers ideal for any professional application.
Matica 500/900 Reference Manual 5
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