User manual RANE AC 24

[. . . ] OPERATORS MANUAL AC 24 ACTIVE CROSSOVER LOW 63 50 40 80 100 125 160 200 250 315 MID 400 315 250 200 500 630 800 HI-MID 4-WAY 3. 15 2. 5 1. 6 4. 0 5. 0 6. 3 8. 0 10. 0 12. 5 HIGH 4 HORN EQ 4 LOW 63 50 40 80 100 125 160 200 250 315 MID 400 315 250 200 500 630 800 HI-MID 4-WAY 3. 15 2. 5 1. 6 4. 0 5. 0 6. 3 8. 0 10. 0 12. 5 HIGH 4 HORN EQ 4 1. 0k 1. 25k Hz 1. 6k 2. 0 1. 0k 1. 25k Hz 1. 6k 2. 0 CHANNEL MUTE 31. 5 A 0 DELAY 10 ms Hz MUTE 160 MUTE 1. 25 kHz MUTE 2 kHz 8 2 kHz 8 CHANNEL MUTE 31. 5 FREQ FREQ FREQ 4-WAY HI-MID FREQ HIGH B 0 DELAY 10 ms Hz MUTE 160 MUTE 1. 25 kHz MUTE 2 kHz 8 2 kHz 8 FREQ FREQ FREQ 4-WAY HI-MID FREQ HIGH 0 DELAY 10 ms 0 DELAY 10 ms 0 DELAY 10 ms 4-WAY 0 DELAY 10 ms 0 DELAY 10 ms 0 DELAY 10 ms 4-WAY AC 24 4-WAY CROSSOVER INPUT OL -64 LIMIT 0 LINK -64 LIMIT 0 -64 LIMIT 0 -64 LIMIT 0 M A S T E R S L A V E INPUT OL -64 LIMIT 0 LINK -64 LIMIT 0 -64 LIMIT 0 -64 LIMIT 0 0 LEVEL 10 0 LEVEL 10 0 LEVEL 10 0 LEVEL 10 0 LEVEL 10 MONO LOW STEREO LINK 0 LEVEL 10 0 LEVEL 10 0 LEVEL 10 0 LEVEL 10 0 LEVEL 10 POWER QUICK START The AC 24 is fully balanced with XLR connectors wired pin 2 "hot" per AES standards. The MID / HI-MID Frequency control becomes the MID / HIGH Frequency control. If you need a summed Mono Low Ouput, push the MONO LOW switch on the front panel. The FREQUENCY controls and other alignment procedures are best set with a realtime analyzer (RTA). [. . . ] These cut-off frequencies are based on each driver's response limitations, physical limits and safe operating area. Most specifications allow a safety margin to accommodate gentler filter roll-off. Each precision potentiometer provides 64 steps covering 3. 3 octaves (. 05 octave per step). The AC 24 possesses 24 dB per octave roll-off, so the crossover points are easily set with the accuracy required to avoid hazard to the driver or degradation in sound quality. For best results, choose speaker components so each operates well within its recommended limits with adequate response overlap. This provides valuable leeway in crossover frequency settings and helps ensure the flattest possible system response. If possible, always use some kind of realtime analyzer to tune your crossover. Manual-4 · This allows delay compensation for distances ranging from 0. 0 to 135 inches (11. 3 feet) [343 cm]. Important Note: The horizontal location of a driver is determined by the front of the voice coil. Identify the driver that is the furthest away from the front of the stack. The horizontal displacement of all other drivers is measured relative to this driver. Take the distance, measured in inches, for each driver and divide by 13. 57. This gives the delay in milliseconds and pot rotation in "fractional-dots. " See Figure 4. Fig. 2 In-Phase Axis Response Without Signal Delay Signal Delay Adjustment Method Two OK, so you want to do this the hard way. The following example outlines one method for Signal Delay alignment of the system in Figure 4. Required tools: Realtime Analyzer Cautions/considerations: With 4th-order filters, it's important to accurately identify crossover frequency settings before adjusting delay. A reference level must be set for each driver at each crossover point. This eliminates errors due to non-flat driver response and room acoustics. When using a 1/3-octave realtime analyzer, best results are achieved if crossover points are set to the nearest 1/3-octave center. Set Input and Output LEVEL controls to unity (the mark between the 8th and 9th dots). Set all rear INVERT switches to the out (non-inverting) position (assuming all drivers are in phase). For this crossover frequency calibration you are looking at the line level Sum output and NOT the acoustic output. i) The 1st 6 dB red LED on the RTA indicates the Low / Mid crossover frequency. [. . . ] Make sure the Pink Noise Level coming into the crossover is able to light the red OL indicator. mic POSITION 2 mic POSITION 1 8. Depending on the maximum safe SPL rating of your system, you may want to use ear protection. UnMUTE the AC 24 Output associated with the driver you are setting the Limiter for. Slowly increase the LIMIT Threshold until the RTA SPL meter reads the SPLMAX calculated in step 4 for the driver you are setting the Limiter for. [. . . ]