Ashly MA-250.4 운영 매뉴얼 - 페이지 9
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MA Amplifier • Operating Manual
5.7c
Gain
This DIP switch sets
the voltage gain of all
amplifier channels to
either 26dB (DOWN)
or 36dB (UP). This is
useful when matching
an amplifier to input
source signal strength.
5.7d
Power Sharing
MA amplifiers have a separate power supply
for each group of four channels. Power sharing
only occurs within each group (ch.1-4 on all
models, ch.5-8 on eight channel models).
Ashly's proprietary
power sharing
algorithms continually
sense and respond
to the signal and
speaker loads to use all
available power from
the amplifier's power supply. The net result is
greater efficiency and better use of available
power to all speaker loads.
Power sharing is enabled on the amplifier
when the power sharing DIP switch is in the UP
position.
When power sharing is turned on, the amplifier
continuously detects and "learns" input signal
and speaker load characteristics within each
channel group, then intelligently allocates
power to each speaker output* within the
group in order to optimize and maximize
available power to each channel, up to the
limit of the power supply, all while drawing less
average current from the wall outlet.
For example, when power sharing is turned
off, all four channels on a MA500.4 deliver up
to their rated output of 500W/ch. That power
is fixed and held in reserve for each channel,
whether it's needed or not.
When power sharing is turned on however, the
output power on any channel can increase
above its normally rated power if other
channels in its group require less power. A
typical application would be a biamped system
with a subwoofer on one channel (or bridged
pair), and full range cabinets on other channels
which require less power than the subwoofer.
In MA500 Watt amplifiers with power sharing
turned on, the maximum power output from any
one channel is now 900W (1,800W bridged),
nearly double the normal rated power. Note
that the total output power available within a
group of four channels still remains at 2,000W,
the group power supply's maximum output.
In other words, if one channel is generating
900W output power at any given moment, the
other three channels only have 1,100W left to
distribute amongst themselves.
In MA250 Watt amplifiers, normally fixed at
250W/ch, enabling power sharing means that
the maximum power output on any one channel
is now 450W, while the total available power for
all four channels still remains at 1,000W.
Power sharing works the same for Low-Z, 70V,
or 100V output loads, which can all be used
independently within the same group of four outputs.
*25V Output: With power sharing enabled, a
channel configured for 25V output can yield its
unused power to other channels, however the
25V channel cannot receive additional shared
power from the other channels. In other words,
25V power is always limited to the normal rated
amplifier power, either 500W or 250W per
channel depending on the amp model.
5.8
Fault & Standby Connections
MA amplifiers offer a logic low (0V)
fault output if the amplifier is in
a fault state (protect light on) or
powered off. For a table describing
fault conditions and their respective
LED codes and fault pin logic state, see
troubleshooting (section 6).
For details on Standby, see section 5.7a.
5.9
Serial Number Sticker
This sticker identifies the product model
number, serial number, and AC mains current/
power rating.
5.10
AC Mains Connector
Always use the AC cord provided by Ashly
for connecting to mains power. The amplifier
is compatible with nominal mains voltage
from 100VAC to 240VAC. WARNING: Do not
remove or lift the mains connector ground.
5.11
Speaker Output Connectors
7.62mm Euroblock
connectors are used for
convenient and secure
wiring to speaker loads.
If the channel pair is set
for Bridge mode, use the
center two pins and observe polarity as shown.
Always use sufficient speaker wiring (see
section 2.3).
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