User manual ELECTRO-VOICE MA-606

[. . . ] User Manual MA-606 Professional Mixer/Amplifier Electro-Voice® MA-606 User Manual Table of Contents Typical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Wire impedance is highest for the longest wire runs and smallest wire sizes. Table 1 shows the two wire cable (copper) lengths permissible for a number of wire sizes and speaker impedances to avoid a loss of more than 0. 5 dB. For a 1 dB loss (basically imperceptible), double the wire lengths. For a 2 dB loss, multiply the lengths by 4. 4. In general, note that high load impedances allow the use of longer, smaller gauge wiring. Electro-Voice® MA-606 User Manual Page 6 3. Balancing relative speaker levels: There is no easy, electrically efficient way to balance and adjust the sound levels among multiple speakers in a low impedance installation. Constant-voltage high impedance systems ease this process because they typically employ speakers equipped with transformers with multiple input taps marked in watts. The low impedance ohm output terminal is provided for direct connection of one or more standard low impedance speaker systems. For example, connect a single speaker system to the common and 4 ohm terminals. Correct connection of several low impedance speakers must follow the rules of proper series and parallel impedance summation. High Impedance/Constant-Voltage Systems Installations that require high impedance speaker loads permit smaller diameter wire for a given power loss in the speaker lines. Usually, low impedance speakers are still used in such systems, but transformers are used at the speaker locations to increase the impedance to the desired value. Multiple transformer taps, labeled in watts, permit easy adjustment of the individual speaker levels. Use simple parallel connection of the transformer primaries (inputs). This eliminates the determination of load impedance and series-parallel speaker connections. For proper operation, all speakers should have transformers with the same voltage rating, i. e. The total of all the power taps should be equal to or less than the amplifiers rated output power. When the total equals the rated power, the amplifier may deliver rated power to the load, depending on the input signal levels. Totals less than the rated amplifier output will not damage the amplifier since the resultant load impedance is higher than the amplifiers rated impedance and thus only reduces the power delivered at maximum amplifier level. How ever, avoid power totals greater than rated amplifier power, since the total load impedance drops below the amplifiers rated load. Preamp Out: The Preamp Out jack provides a line-level mix of the input signals, fed through a 1/4 inch phone plug wired with a single-conductor shielded cable. Use the signal at the Preamp Out jack to feed an external equalizer or signal processor whose output would connect to the Power Amp In jack. Page 7 Electro-Voice® MA-606 User Manual The preamplifier output may also be used alone to drive an additional external power amplifier with its own set of speakers. When the Preamp Out jack is used, the mixed signal to the internal power amplifier is interrupted. [. . . ] Do not take the risk of electro-shock or shock hazard. To reduce the risk of electro-shock, all connections have to be accomplished before it is permissible to connect the amplifier to the main supply. Verify that all external connections are complete and that no short-circuits exist in any of the wiring. The overall sound reinforcement installation has to be in accordance to the laws, regulations, standards, and guidelines that are relevant and applicable in the country/locality where the equipment is going to be operated. AC Power Supply This equipment operates from a power source that does not apply more than 244 VAC between the supply conductors or between either supply conductor and ground. DC Power Supply A 24V DC power source (i. e. [. . . ]