Rane DA 26S DA 26S Manual - Page 7

Setup & Operation...continued from page Manual-1... 4. Next, set up the six OUTPUTS. First, determine the num- ber of zones served and the signals to be sent to each. Using a drawing like the example application diagram in the Data Sheet is helpful. For ease of wiring, make Outputs serving a common zone adjacent. Select Full-range, High-pass or Lowpass as required for each output. The following are possible zone configurations: • Full-range only for medium size bookshelf speakers. • High-pass only for small distributed ceiling speakers. • Full-range output combined with Low-pass Output to en- hance bass response. • High-pass output combined with Low-pass Output for true bi-amp operation. 5. The ±12 dB OUTPUT trims set Output levels, with relative levels between Full-range, High-pass and Low-pass. Note: the Output trims do not affect Low-pass loudness compensation or Priority Input level. The idea is to set system levels for proper operation at the maximum required SPL (with Remote Level controls set for unity gain). Remote Level controls then attenuate the level as required. Automatic loudness compensation is achieved by altering the gain control law of any Remote port associated with a Low-pass Output. A Low-pass Output is always used in conjunction with a high-pass or full-range Output. Because the Remote Level control turns the low-pass Output down at a lesser rate than the high-pass or full-range Output, bass response is enhanced. The corner frequency for loudness compensation is set by the CROSSOVER frequency selection. The reference level for the room is set with the OUTPUT trim on the front panel. Any Remote Level gain change results in automatic loudness compensation. Variations in wire type do not greatly affect the performance of the Remote controls. However, 22-gauge stranded wire with a flexible jacket is recommended. You may use 3-conductor unshielded remote control signal cable for shorter runs (less than 100 feet [30 meters]). For longer runs, we recommend using shielded cable. The type of wire required is influenced by your installation and local electrical codes. Rane Corporation does not provide cable- please contact your local retail or wholesale outlet. 7. The balanced PRIORITY INPUT operates at line or mic level, determined by the MIC / LINE switch, on the rear panel next to the PRIORITY INPUT jack. See Rear Panel (1) for unbalanced connection rules. Note: the Priority Input is not influenced by the AGC, Crossover, Output trims or Remote Level controls. The gain range for MIC level Input is 30 to 60 dB. The gain range for LINE level Input is 0 to 30 dB. Set the PRIORITY GAIN to prevent overloading the Input - if the Priority Gain OL illuminates, turn down the GAIN. 8. The PRIORITY DETECT threshold is calibrated in dBu, and monitors the signal after the input preamp. Any change in PRIORITY GAIN setting affects the DETECT sensitivity. Set the GAIN, then set DETECT. The range of operation is +4 dBu to ON. The consequence of setting DETECT too low is premature triggering due to background noise. Setting DETECT too high results in excess delay and a sudden large step in amplitude (perceived as a "pop"). If a paging mic is used in an environment with a lot of background noise, we recommend a push-to-talk device. The release time is fixed at about 6 seconds. The release delay is based on the typical time required to accommodate a pause in speech or dead-time between music programs. 6. A port for a wired Remote Level control is provided for each Output. Note: Remote Level controls do not affect the level of the Priority Input. Each port provides a 5 volt reference voltage (REF), a control voltage input (Vc) and a ground reference. The gain control law for Vc is 50 mV/dB. Using the optional VR 1 Remote control provides an audio taper response from 0 dB to > -80 dB. To control more than one Remote Port with a single Remote control, it is only necessary to connect the Vc pin of each additional port. An external ground referenced control voltage with a range of 0 to 5 volts may be used with the Remote ports. If the ratiometric output of a linear potentiometer is used, (GND to CW, Vc to center tap, REF to CCW), a linear log response results. Audio taper response requires a potentiometer with a reverse log taper. Audio taper response is achievable using a linear potentiometer by connecting a resistor equal to 1/10th the value of the potentiometer between GND and Vc as shown below: cw GND 1k Vc 10k REF 9. The PRIORITY DUCKER depth sets the amount of attenuation applied to the LINE INPUT signal when the PRIORITY INPUT is activated by the DETECT threshold. DUCKER depth is continuously adjustable over a range of 0 dB to -80 dB. For equal mixing of PRIORITY and LINE, set the DUCKER to 0 dB. For PRIORITY replaces LINE operation, use -80 dB. A value of -12 dB (2 o'clock) is typical for PRIORITY (page) talks over LINE (music) operation. 10. The state of the PRIORITY ASSIGN port determines Priority Input assignment to each of the six Outputs. Assignment pins are active low with passive internal pull-up. Any combination of pins may be active at one time. The select ALL pin is provided for convenience. To complete an assignment, the Output must be selected by the PRIORITY ASSIGN port and Priority Detect must be active. Note that if a combination of Crossover Outputs is used in one zone, all Outputs serving the zone must be selected by the PRIORITY ASSIGN port. The type of wire recommended is similar to the description in Step 6 above. ©Rane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5000 TEL 425-355-6000 FAX 425-347-7757 WEB rane.com Manual-4 DOC 110958