User manual MYRYAD MA500

[. . . ] 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 Myryad's 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 goldplated 5-way binding posts. [. . . ] DO NOT REMOVE THE COVER, OR ATTEMPT TO MODIFY OR REPAIR THE AMPLIFIER YOURSELF. REFER ALL SERVICING TO A QUALIFIED TECHNICIAN. STANDBY MA 500 Five Channel Power Amplifier 1 FRONT PANEL CONTROLS 1 Standby 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. 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. CAUTION: WHEN IN STANDBY MODE THE INTERNAL CIRCUITRY OF THE MA 500 IS STILL LIVE, SO ALL SAFETY PRECAUTIONS MUST BE FOLLOWED. LOUDSPEAKER OUTPUT PROTECTION AND MUTING 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. The protection circuits of each of the five channels of the MA 500 are linked together, so whichever channel's protection is activated, whether by short circuit, overheating or any other reason, all five speaker relays will open so muting all five channels. 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 amplifier's 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. ACCESSORIES 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. 6 3 SETTING UP YOUR SYSTEM 6 7 4 Remote trigger control input/output If the MA 500 is being used in a system without a Myryad M-Series preamplifier, processor or integrated equipped with My-Link, the REMOTE TRIGGER input may be used to allow the MA 500 to be remotely switched into or out of STANDBY. If your preamplifier or processor has a TRIGGER output which delivers a DC trigger signal when the unit is switched on (or out of standby) then it can be linked to the MA 500 to switch the MA 500 out of/into standby also. A lead must be used which is fitted with a 3. 5mm mini-jack plug to connect to the MA 500's REMOTE TRIGGER input socket. The five channels are numbered 1 to 5 and also named for Home Cinema use (see above). [. . . ] This will allow the different products to be remotely controlled via the infra-red receiver on, for example, an MDP 500 PreamplifierProcessor or any Myryad M-Series Preamplifier (or Integrated Amplifier) or a suitable multi-room controller. When joined via the My-Link, the MA 500 will respond to STANDBY and MUTE operations on the preamplifier (whether operated from the front panel or by remote control). For example, if both the preamplifier and the MA 500 are in STANDBY, then switching the preamplifier out of standby will also bring the MA 500 out of standby. In this way an MDP 500 + MA 500 can be operated with the same ease as an integrated amplifier. [. . . ]