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See below for output wiring in Bridged Mono configuration. Audio Installation: Output Wiring Warning: Be sure that the AC power is off prior to connecting or disconnecting any signal wiring. Alesis amplifiers can reliably drive 2 W loads in Stereo mode and 4 W loads in Bridged Mono mode. However, the impedance of a loudspeaker varies with frequency, and its nominal rated impedance is not necessarily its minimum impedance. Some loudspeakers carry both nominal and minimum impedance specifications, and some are supplied with impedance curves. When connecting Matica 500/900 Reference Manual Installations multiple loudspeakers or systems to any amplifier, care should be taken that the actual load impedance does not drop below the amplifierOs rated output load. Alesis amplifiers will not be damaged by excessively low output load impedances, but they will not be able to provide full output power and their protection circuits may automatically cut off their outputs until the low load condition is removed. Gauge (AWG) Diameter (Solid) DC Resist./ 30 m (100O) Cable Length Resulting in a 1 dB Power Loss 4 W Load Impedance 8 W Load Impedance 6 4.12 mm 0.08 N 366 m 1200O 740 m 2400O 8 3.26 mm 0.13 N 244 m 800O 488 m 1600O 10 2.59 mm 0.20 N 145 m 475O 290 m 950O 12 2.05 mm 0.32 N 91 m 300O 182 m 600O 14 1.63 mm 0.52 N 58 m 190O 116 m 380O 16 1.29 mm 0.82 N 37 m 120O 74 m 240O 18 1.02 mm 1.32 N 23 m 75O 46 m 150O 20 0.81 mm 2.08 N 15 m 50O 30 m 100O 22 0.64 mm 3.30 N 9m 30O 18 m 60O Table 2: Speaker Cable Losses. Values are calculated based on the sum of the length of both conductors. Note that a 1 dB power loss is equivalent to 12% of the amplifier power. The wire thickness or gauge should be chosen according to the load impedance and the length of the wire run from the amplifier to the loudspeaker terminals. See Table 2. Because the wireOs resistance to the flow of current is in series with the loudspeaker, a wire with lower resistance will deliver more power to the loudspeaker; also, the amplifier will be able to control the loudspeakerOs movement betterNthis latter is called Odamping factor.O ItOs interesting to observe that an amplifierOs rated damping factor is essentially unrealizable unless the loudspeaker is connected directly to the amplifierOs output terminals without any interconnecting cables. For example, a typical installation using 20 feet (6 m) of 16 AWG wire connecting an amplifier and an 8 ohm speaker will result in a damping factor of 23.5 with a perfect amplifier; with a real world amplifier, the damping factor will be even lower. Many special cables are sold for use with audiophile and studio loudspeakers. We make no recommendations for cables other than that there be sufficient copper in them to keep the total resistance acceptably low. Loudspeaker outputs for both channels are on heavy-duty five-way binding posts which can accept single or dual banana plugs, bare wire or terminals. See Figure 2 above. Note the unique in-line configuration of these binding posts. Matica 500/900 Reference Manual Installations Banana plugs are inserted in the ends of the plastic insulating nuts on each output terminal. The terminals are spaced to accept standard 3/4O (19 mm) spaced dual banana plugs. Alternately, the insulating nuts may be loosened so that stranded or solid wire may be attached. The threaded posts under the nuts have holes in them which can accept fairly heavy gauge wire, but if the wire does not fit through the hole, it may be wrapped around the post. In either case, the nut should be snugly tightened to secure the wire in place. Caution: Be sure that no stray wire strands accidentally touch an adjacent wire or terminal. Lightly tinning the end of a stranded wire with solder after the strands are twisted together will help prevent it from fraying and will insure that all strands are connected, but be careful when tightening or stressing the wireNtinned wires may be brittle. If a crimp lug terminal is used on the speaker wire and the lug is too small to fit onto the threaded post, one leg of the terminal may be inserted in the hole in the post. As with wire connections, make certain that the terminal is snugly attached by tightening the plastic insulator nut. A positive voltage applied to the High (+) side of either input when the amplifier is in Stereo mode will result in a positive voltage appearing on the Red (+) terminal of the corresponding output channel. When connecting the output of the amplifier in Bridged Mono mode (assuming that the input has been connected to Channel A and the Stereo/Mono rear panel switch has been set to Mono), the loudspeaker wires are connected to the two center terminals only. Note that, unlike amplifiers from some other manufacturers, Bridged Mono connections are to Red and Black terminals, not to two Red or two Black terminals. Do not connect anything to either of the two outer terminals. In Bridged Mono mode, applying a positive voltage to the High (+) side of the C...
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