User manual MYRYAD MA120 240 360

[. . . ] 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. They can also be used, in combination (e. g. 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. [. . . ] 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. High quality XLR-to-XLR balanced interconnects should be used. 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. Take care of these links and store them in a safe place. 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. Check that the LED in the STANDBY button is green. · The input connection is loose or missing. · 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. · The fuse in the power cord inlet has failed. Unplug the power cord from both the wall socket and the amplifier and pull out the small receptacle below the power cord inlet. The further fuse is the operative one and should be checked. [. . . ] 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). If you wish to estimate the maximum cable length for your system then you can use the following equation: · Maximum cable length (metres) = (7, 800 ­ N x 450) C for 1 dB loss at 20 kHz Where: · N = Number of MA 120s wired to MI 120 · C = Cable capacitance in pF/metre. The MP 100 Preamplifier can also be used to drive a number of daisy-chained MA 120 or MA 240 Power Amplifiers. [. . . ]