User manual DOD SIGNAL PROCESSORS

[. . . ] Signal Processors 18-0121-B 6/8/99 10:24 AM Page 1 C ONTENTS RTA SERIES II. . . . . . . . . . . . . . . . . . . . . 2 8 3 4 / 8 3 5 S E R I E S I I. . 20 1 Signal Processors 18-0121-B 6/8/99 10:24 AM Page 2 2 CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN A T T E N T I O N : RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR W A R N I N G : TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE The symbols shown at left are internationally accepted symbols that warn of potential hazards with electrical products. The lightning flash with arrowpoint in an equilateral triangle means that there are dangerous voltages present within the unit. The exclamation point in an equilateral triangle indicates that it is necessary for the user to refer to the owner's manual. [. . . ] · Send a broadband signal into the crossover and slowly bring up the LOW level control. 834: Apply power to the mid frequency amplifier and turn up the MID level control to the desired level. 834/835: Finally, apply power to the high frequency power amplifier and bring up the HIGH level control to the desired level. Once the output levels are set, any phase problems can be corrected with the phase inversion switches on the rear panel (834 only). THE PHASE INVERSION SWITCHES ON THE 834 ARE MECHANICAL SWITCHES AND SHOULD ONLY BE CHANGED WHEN THE POWER AMPLIFIER FOR THAT OUTPUT IS OFF. Turning down the level controls on the 834 will not prevent transients from appearing at the outputs when changing the phase switches while the crossover is on. These transients can damage power amplifiers, speakers, Signal Processors 18-0121-B 6/8/99 10:25 AM Page 15 and drivers. STEREO OPERATION USING A MONO SUBWOOFER This mode of operation provides: 834: Channel 1 and Channel 2 high frequency outputs, Channel 1 and Channel 2 mid frequency outputs, and one summed low frequency output. 835: Channels 1 and 2 high frequency outputs and one summed low frequency output. 15 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. Set both LOW level controls to the same level to ensure that both controls contribute the same amount of signal to the Low Frequency Sum output. Note: that there is no phase inversion switch on the 834 for the Low Frequency Sum output. Any phase problems must be corrected using the phase inversion switches on the other four outputs. MONO OPERATION Depress the Stereo/Mono switch (LED indicator lit). When operating the crossover in stereo mode, the MID/HIGH frequency control of the 834 is variable from . 75 kHz - 7. 5 kHz. When operating the crossover in mono mode, the HIGH-MID/HIGH frequency control range is from 2 kHz - 20 kHz. The mono mode setup procedure is the same as for stereo mode, except that the bottom row of markings on the front and rear panels will be followed instead of the top row. Be sure that the amplifiers are off, that the gain control is set to 0 dB, and that the level control is set to - before proceeding to adjust the crossover frequencies and levels. The Low Frequency Sum output is not usable in the mono mode. 834 SPECIFICATIONS Crossover type: Stereo 3-way, Mono 4-way. I/O Connectors: 834: 1/4" tip-ring-sleeve phone jacks for balanced/unbalanced connections. Signal-To-Noise Ratio: Greater than -90 dB Filter Type: 18 dB/octave Butterworth state-variable filters. Signal Processors 18-0121-B 6/8/99 10:25 AM Page 16 16 835 Crossover Frequencies - Stereo: LOW/MID: 50 Hz to 5 kHz in two ranges, MID/HIGH: 750 Hz to 7. 5 kHz. - Mono: LOW/LOW-MID: 50 Hz to 5 kHz in two ranges, LOW-MID/HIGH-MID: 50 Hz to 5 kHz in two ranges, HIGH-MID/HIGH: 2 kHz to 20 kHz. Maximum Output Level: +21 dBu (ref. : 0. 775 Vrms). SPECIFICATIONS Crossover type: Stereo 2-way, Mono 3-way. I/O Connectors: 835: Inputs: 1/4" tip-ring-sleeve phone jacks for balanced/unbalanced connections. Outputs: 1/4" tip-ring-sleeve phone jacks for balanced connections and 1/4" tip-sleeve phone jacks for unbalanced connections. Signal-To-Noise Ratio: Greater than -90 dB Filter Type: 18 dB/octave Butterworth state-variable filters. Crossover Frequencies Stereo: LOW/HIGH: 100 Hz to 10 kHz in two ranges. [. . . ] The Gate Threshold control of the 866 allows the user to adjust the threshold level of the noise gate. When the control is in the fully counter clockwise position, the noise gate is inactive and all signals will pass through. The Output Gain control allows the user to make up for gain lost in the compression process and to set the output level of the compressor for compatibility with other equipment. Here are a few compressor settings that can serve as a starting point for the applications covered up to this point: Vocal Compression: Compressor Threshold: low Ratio: 5:1 Attack: 10 msec Release: 200 msec Guitar Compression for Extra Sustain: Compressor Threshold: low Ratio: 15:1 Attack: . 5 msec Release: 500 msec Protective Limiting: Compressor Threshold: high Ratio: :1 Attack: 0. 1 msec Release: 90 msec For more information on compressors and applications, consult the Yamaha Sound Reinforcement Handbook (Hal Leonard Publishing, #HL 00500964). [. . . ]