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When the amplifier is in standby mode the
loudspeaker output terminals are isolated
from the amplifier by a high quality relay.
When the amplifier is first switched on
from standby mode the loudspeaker
outputs remain disconnected for a few
seconds to allow the internal voltage levels
to settle. The loudspeaker outputs are
immediately disconnected again when the
amplifier is switched back into standby
mode.
The same loudspeaker mute relay is used
to protect both the amplifier and your
loudspeakers against possible damage. If
any one of a number of fault modes is
detected (loudspeaker outputs short circuit,
amplifier overheating, amplifier DC fault)
the loudspeakers will be disconnected
from the amplifier to protect both. In the
case of a short circuit or DC fault the
loudspeakers will be re-connected after a
few seconds, but will be disconnected
again if the fault persists. If overheating has
caused the protection system to operate,
then it will take some time for the
heatsinks to cool sufficiently to allow the
loudspeakers to be re-connected (probably
between five and fifteen minutes
depending upon the room temperature
and ventilation). The amplifier will cool
more quickly if it is switched to standby
mode, or if the POWER is switched OFF.
1Standby
When the amplifier is plugged into a live
wall socket and the POWER switched is
turned ON, it will power up in standby
mode and the LED (Light Emitting Diode)
in the STANDBY button will glow red. In
this mode the internal circuitry of the
amplifier is powered up, but disabled so
that it consumes very little power and is
isolated by relays at its outputs.
When the STANDBY button is pressed the
amplifier circuitry will be activated and the
LED will flash blue. After about four
seconds delay the loudspeaker outputs will
be connected to the amplifier and the LED
in the STANDBY button will glow blue
continuously. When the STANDBY button
is pressed again the amplifier will be
returned to standby mode. The LED in the
STANDBY button will change back to red.
PLEASE NOTE: WHEN THE POWER
AMPLIFIER IS REMOTELY ACTIVATED FROM
ANOTHER UNIT, THERE MAY BE A BRIEF
DELAY BETWEEN THE CLOSING OF THE
OUTPUT RELAYS OF THE TWO UNITS. THIS IS
NORMAL AND NO CAUSE FOR CONCERN.
CAUTION: WHEN IN STANDBY MODE THE
INTERNAL CIRCUITRY OF THE MA
500 IS
STILL LIVE, SO ALL SAFETY PRECAUTIONS
MUST BE FOLLOWED.
OPERATING YOUR
SYSTEM
FRONT PANEL
CONTROLS LOUDSPEAKER
OUTPUT PROTECTION
AND MUTING
The protection circuits of each of the five
channels of the MA 500 are linked
together, so whichever channels protection
is activated, whether by short circuit,
overheating or any other reason, all five
speaker relays will open so muting all five
channels.
The MA 500 has two levels of over-
temperature protection. If the lower
temperature threshold is exceeded, the
maximum power output of the amplifier is
reduced until the temperature falls to a safe
level. The amplifiers gain is unaffected so
this first level protection will probably
have no audible effect. If the higher
temperature threshold is exceeded the
loudspeaker relays are opened, muting all
five channels as described above.
6
MA 500 Five Channel Power Amplifier
STANDBY
1
The Myryad MA 500 Power Amplifier has
been designed to offer a combination of
high quality sound reproduction and
simple yet elegant styling. It can be used to
provide power for high quality Home
Cinema or music surround systems when
partnered by a suitable surround
preamplifier-processor such as Myryads
MDP 500. It can also be used in install
situations as a high-quality high-powered
distribution amplifier.
The MA 500 has unbalanced line inputs
plus directly linked line outputs for each
channel, all on high-quality gold-plated
RCA phono sockets. Loudspeaker outputs
are provided by a pair of solid metal gold-
plated 5-way binding posts.
Like all Myryad M-Series Power Amplifiers,
the MA 500 may be controlled remotely
via the My-Link communications bus
when used with other Myryad M-Series
products. My-Link allows remote control of
standby and mute functions. In addition to
this, the MA 500 power amplifier may be
switched into or out of standby remotely
using its DC trigger input.
3 MA 500 applications include:
-Use in conjunction with the MDP 500
Digital Preamplifier-Processor, delivering
five channels at 100 watts into 8-„¦in
Home Cinema systems of the highest
quality.
-Use in a multi-room setup, possibly
together with other MA 500s, to deliver
high-power high-quality audio to a
number of different rooms with
minimal crosstalk between channels.
-Stereo bi-amplifier operation with an
MP 100 Stereo Preamplifier - the
MA 500 delivering 2 x 100 watts/8-„¦into
each loudspeaker (one MA 500 channel
unused).This amplifier generates a modest amount
of heat and thus requires ventilation. Do
not place it on a rug or other soft surface
into which it could sink, obstructing the
air inlets in its underside. Do not allow
papers or cloth to obstruct the ventilation
grille in the top cover. The amplifier
should not be installed in a built-in
situation such as a bookcase or cabinet
unless proper ventilation is provided. If the
amplifier is moved shortly after operation
take care not to touch the heatsinks, which
are accessible from below, as they may be
very hot. The amplifier is designed for use
in moderate climates.
CAUTION: TO PREVENT A FIRE OR SHOCK
HAZARD, DO NOT PERMIT THIS PRODUCT
TO BECOME WET OR EXPOSE IT TO
DRIPPING OR SPLASHING. DO NOT PLACE
OBJECTS FILLED WITH LIQUID, SUCH AS
VASES, ON THE AMPLIFIER. IF LIQUID IS
ACCIDENTALLY SPILLED ON IT, IMMEDIATELY
SHUT OFF ITS POWER AT THE WALL SOCKET
AND UNPLUG THE AC POWER CORD.
ALLOW SUFFICIENT TIME FOR COMPLETE
EVAPORATION TO OCCUR BEFORE
OPERATING THE AMPLIFIER AGAIN. IF THE
LIQUID IS ANYTHING BUT WATER AND/OR
ALCOHOL, A QUALIFIED SERVICE
TECHNICIAN SHOULD EXAMINE THE
AMPLIFIER BEFORE IT IS USED AGAIN. DO
NOT PLACE NAKED FLAMES, SUCH AS
LIGHTED CANDLES ON THIS PRODUCT.
DO NOT REMOVE THE COVER, OR ATTEMPT
TO MODIFY OR REPAIR THE AMPLIFIER
YOURSELF. REFER ALL SERVICING TO A
QUALIFIED TECHNICIAN.
Your Myryad Power Amplifier is supplied
complete with the following accessories:
-My-Link interconnect (0.5m RCA-RCA)
-Separate mains power cord to suit
country of sale.
INTRODUCTION INSTALLATION AND
SAFETY NOTES
ACCESSORIES
