User manual DOD SR823-834

[. . . ] All other servicing should be referred to qualified service personnel. For units equipped with externally accessible fuse receptacle: Replace fuse with same type and rating only. U. K. Mains Plug Warning A molded mains plug that has been cut off from the cord is unsafe. [. . . ] Also, since lower priced, smaller amplifiers can do the job of the larger and much more expensive amplifiers needed to drive full-range amped systems, the cost of a sound system can be significantly reduced (and sound better in the process). It may also be easier to haul several smaller power amplifiers around, rather than one big one, making portable systems easier to handle. 1 2 SR Crossover INSTALLATION ** Be sure to begin installation with all AC power to your sound system turned off. Install the crossover in a rack using the provided rack screws and washers. Route the AC power cord away from audio lines and plug into a convenient outlet. Connect audio lines to the crossover using the appropriate input jacks to channels 1 and 2 (for stereo operation) or to channel 1 (for mono operation). Connect the appropriate output jacks for stereo 3-way, mono 4way operation (SR834 only), or stereo 2-way, mono 3-way (SR823). Follow the top labels for stereo connection or the bottom labels for mono connection. For balanced operation using 1/4" phone plug connectors, use only tip-ring-sleeve (stereo) jacks. For unbalanced operation using 1/4" phone plug connectors, use only tip-sleeve (mono) jacks. FOR BALANCED CONNECTION: Wire XLR connections as follows: Pin 2: high Pin 3: low Pin 1: ground or common FOR UNBALANCED AMPLIFIER CONNECTION: To make an unbalanced connection to the unit's XLR connectors, wire the line connectors as follows: Pin 2: high Pin 3: NO CONNECTION Pin 1: ground Use tip-sleeve 1/4" phone plug connectors for connection to the amplifiers, wired as follows: tip: high sleeve: ground Once the crossover is installed, adjusted, and tested, an optional security panel may be secured to the front panel of the unit to prevent tampering. SR Crossover SETUP **CAUTION: DO NOT TURN ON THE POWER AMPLIFIERS YET. Consult your speaker and driver manufacturer's specifications for the recommended crossover frequencies. Basic setup procedures for the crossovers are as follows: · Label each power amplifier for its respective frequency band. SR834: LOW, MID, or HIGH for stereo operation; LOW, LOW-MID, HIGH-MID, or HIGH for mono operation. SR823: LOW, HIGH for stereo operation or LOW, MID, HIGH for mono operation. · Set each power amplifier volume control at maximum and connect each power amplifier output to its correct speaker or driver. Apply power to the mixer then the power amps. 3 STEREO OPERATION Using the markings non-italicized markings on the front and rear panels and set each channel as follows: · Set the gain control to 0 dB. [. . . ] STEREO OPERATION USING A MONO SUBWOOFER This mode of operation provides: SR834: Channel 1 and Channel 2 high frequency outputs, Channel 1 and Channel 2 mid frequency outputs, and one summed low frequency output. SR823: Channels 1 and 2 high frequency outputs and one summed low frequency output. The setup procedure is the same as for the stereo mode, except that, instead of connecting both low frequency outputs, connect only the Low Frequency Sum output to the low frequency amplifier. [. . . ]