Ashly MA-250.4 Operating Manual - Page 4
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MA Amplifier • Operating Manual
Table of Contents
1
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2
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3
4
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5
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Gain..................9
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6
7
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8
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1
Introduction
Thank you for your purchase of this Ashly MA
power amplifier. This product uses state of the
art, light weight, high power, high efficiency
......... 5
switching technology developed through
years of design and testing. MA amplifiers
....... 5
are available in two power levels, designed to
meet the most demanding live sound and fixed
installation sound systems in stadiums, arenas,
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performance venues, worship spaces and
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convention centers.
1.2
Features
.. 7
•
Four or eight channel amplifier models
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•
500W or 250W per channel models
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•
Proprietary, intelligent power sharing
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(defeatable)
........ 7
•
Muliti-Mode Output: Each channel can be
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independently configured for Low-Z (2/4/8
....... 8
Ohm), 25V, 70V, or 100V output
•
Universal input PFC power supply
...... 8
................ 8
•
Very high efficiency power supply and
amplifier design
•
Extremely low noise and wide dynamic range
..............8
•
Euroblock input & speaker connectors
..........8
•
Front panel power switch, defeatable
.................9
•
Front panel level controls, defeatable
.9
•
80Hz hi-pass filter, on/off per channel
........9
•
Clip limiter, on/off per channel
.............9
•
Front panel LEDs for clip/mute, signal,
.......... 10
current, temperature, bridge mode, protect,
and front panel disable
•
Amplifier gain setting: 26dB or 36dB
•
Remote DC level control per channel
•
Remote standby contact closure,
switchable polarity
•
Fault logic output
•
Continuously variable cooling fan(s)
•
Protection: Inrush current limitation, over-
temperature, output short-circuit/over-
power, output DC, mains fuse
•
Safety/Compliance: cTUVus, CE, FCC,
RoHS
•
Ashly five year warranty
2
Requirements
Before connecting to AC mains power, make
sure that the mechanical installation, cooling
requirements, wiring, and controls are all set to
the configuration needed for your application.
Failure to do so could result in damage to the
unit or to other components in the system.
2.1
AC Mains
This amplifier uses a universal Switch Mode
Power Supply (SMPS) with active Power Factor
Correction (PFC). It is compatible with nominal
AC mains voltage from 100 to 240VAC, 50-
60Hz.
Use only the provided AC cord to connect to AC
mains.
All MA models have a fixed, non-defeatable
warm-up delay of about three seconds, to
protect against excessive in-rush current
when first powered up. Power consumption is
indicated on the back panel label near the AC
inlet. To reduce the risk of ground loop hum,
all sound system ground references should
4