User manual MYRYAD MA120 240 360

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[. . . ] Myryad Systems Ltd 2 Piper's Wood Waterberry Drive Waterlooville PO7 7XU Tel +44 (0) 23 9226 5508 Fax +44 (0) 23 9223 1407 info@myryad. co. uk For further information, please contact Myryad direct or visit: www. myryad. co. uk ma 120/240/360 Power Amplifiers Owner's manual STANDBY MA 120 Stereo Power Amplifier contents · Introduction · Installation and safety notes · Accessories · Setting up your systems · Rear panel connections · Operating your system · Front panel controls · Loudspeaker output protection and muting · Trouble-shooting guide · Appendix · The MI 120 plus MA 120 in "Bi-Amplified" Systems · Using the MA 240 with an MI 120 or mixed MA 120s and MA 240s with an MP 100 in Bi-Amp or Tri-Amp systems · The MI 120 plus MA 120s in "Tri-Amplified" systems · The MI 120 or MP 100 with one or more 120s or MA 240s in Multi-Room systems introduction 3 3 3 4 5 7 7 7 8 9 The Myryad MA 120, 240 and 360 Power Amplifiers have been designed to offer a combination of high quality sound reproduction and simple yet elegant styling. They can be used to provide power for high quality stereo systems when partnered by a suitable preamplifier such as Myryad's MP 100, or with a Myryad integrated amplifier in bi-amp or tri-amp systems. one MA 240 Stereo Power Amplifier plus one Myryad MA 360 Three Channel Power Amplifier), to power a full-surround music or Home Cinema sound system of the highest quality. The MA 120 and MA 360 have unbalanced line inputs plus directly linked line outputs, all on RCA phono sockets. [. . . ] (The mute delay in the MA 120 is about 4 seconds, but in the MA 240 and 360 it is about 8 seconds to allow for the longer settling time of the larger amplifiers' circuits. ) PLEASE NOTE: WHEN THE POWER AMPLIFIER IS REMOTELY ACTIVATED FROM ANOTHER UNIT, THERE WILL BE A BRIEF DELAY BETWEEN THE CLOSING OF THE OUTPUT RELAYS OF THE TWO UNITS. When the STANDBY button is pressed again the amplifier will be returned to standby mode. CAUTION: WHEN IN STANDBY MODE THE INTERNAL CIRCUITRY OF THE MA 120, 240 OR 360 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. 7 Line outputs ­ normal (unbalanced) Each channel's line output is directly connected to its line input ­ without buffering. The line output allows power amplifiers to be "daisy-chained" so that bi-amp, tri-amp and multi-room systems may be built. For a more detailed discussion of bi-amping, tri-amping and multi-room installations please refer to the Appendix. Only unbalanced line outputs are fitted. 8 Line inputs ­ balanced (MA 240 only) The BALANCED line inputs can be driven from the balanced line outputs of any good quality stereo preamplifier (such as the Myryad MP 100) or any other suitable line level source. In order to use the BALANCED line inputs the two XLR jumper links ( the "U"-shaped gold-plated links plugged into the BALANCED input sockets) must first be removed. They will be needed again if the amplifier's unbalanced inputs are to be used. 6 7 trouble-shooting guide Some of the most common problems No sound: · Power turned off or system in standby mode. · Protection relay has operated because of a short circuit loudspeaker wire or amplifier overheating. Carefully check all wiring after switching the amplifier POWER OFF to allow it to cool. Unplug the power cord from both the wall socket and the amplifier and pull out the small receptacle below the power cord inlet. If this too fails, then return the amplifier to your dealer for service. MP 100 Preamplifier): · My-Link cable is loose or not connected. Loud buzz or hum: · Interconnect cable pulled partially out of its socket. Incorrect operation ­ some functions not working: · Control processor latched. [. . . ] There will be no adverse loading effect owing to the low output impedance of the MI 120 and high input impedance of the MA 120 (450 and 100 k respectively). The MA 120s can either be situated close to the MI 120 with speaker cables run off to each room (similar to the diagram in Figure 4), or each MA 120 could be located in a separate room with its loudspeakers ­ with long interconnects between the MI 120 and the MA 120s. In the latter case the daisy-chain wiring system may not be so convenient, so an adaptor which allows the MI 120 BI-AMP output to feed a number of cables (one cable to each MA 120) might be preferred. In either case, the maximum recommended total length of interconnect cable feeding the MA 120s is in the region of 20 to 50 metres (depending upon the cable capacitance and the number of MA 120s connected). [. . . ]

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