User manual RANE AC 23S

[. . . ] OPERATORS MANUAL AC 23S ACTIVE CROSSOVER CH 1 MASTER LEVEL 4 2 0 10 6 8 2 0 10 2W: INACTIVE LEVEL 4 6 8 LOW MUTE 2 DELAY 4 6 8 MIN MAX 2W: INACTIVE 2W: LOW FREQUENCY LEVEL DELAY 240 400 MUTE 200 600 4 6 4 6 150 750 100 850 80 900 2 8 2 8 70 1k 0 10 MIN MAX LOW / MID MID 2W: LOW / HIGH FREQUENCY 700 1. 0k 550 2. 0k 475 2. 8k 350 4. 5k 250 5. 8k 190 7. 0k MID / HIGH HIGH LEVEL 4 2 0 10 6 8 2 CH 2 MASTER LEVEL 4 6 8 0 10 2 0 10 2W: INACTIVE LEVEL 4 6 8 LOW MUTE 2 DELAY 4 6 8 MIN MAX 2W: INACTIVE 2W: LOW FREQUENCY LEVEL DELAY 240 400 MUTE 200 600 4 6 4 6 150 750 100 850 80 900 2 8 2 8 70 1k 0 10 MIN MAX LOW / MID MID 2W: LOW / HIGH FREQUENCY 700 1. 0k 550 2. 0k 475 2. 8k 350 4. 5k 250 5. 8k 190 7. 0k MID / HIGH HIGH LEVEL 4 2 0 10 6 8 AC 23S ACTIVE CROSSOVER MONO MASTER SUBWOOFER SUB / LOW MID 4W: MID / HIGH 5W: MID / HIGH-MID MONO 4W OR 5W: INACTIVE LOW LOW / MID 4W: INACTIVE 5W: HIGH-MID 4W: INACTIVE 5W: HIGH-MID / HIGH HIGH POWER QUICK START Labels above the controls refer to the unit being operated in the 2- or 3-Way Stereo mode. Labels below the controls refer to the unit being operated in the 4- or 5-Way Mono mode. The fact that the AC 23S is a multiple function unit means the outputs are switched around in Mono mode. To operate the unit in Stereo 3-Way mode, be sure the rear panel switches are set for STEREO 3-Way, and the 4W / 5W switch is set for 5-Way. [. . . ] Setting delay controls by ear is supposedly possible, but very tricky and unreliable. The following methods are a couple In-Phase Axis Response Without Time Delay of (but by no means all) means of setting time delay. Corrected In-Phase Axis with Time Delay on the Low Driver Manual-9 Time Delay Adjustment Using Realtime Analyzer & Pink Noise This method outlines the use of a realtime analyzer, pink noise generator and flat response microphone to set crossover time delay. Some references will be made to the Rane RA 30 realtime analyzer for those with the intelligence and good taste to use one of these regularly. We recommend using a 1/3 or 2/3-octave analyzer as either of these is more likely to match your specific crossover points than a one-octave analyzer. And it is important to match the analyzer to the crossover point as closely as possible for proper phase alignment, otherwise the analyzer readings may be misleading. STEP BY STEP PROCEDURE A 3-Way mode consisting of High, Mid and Low drivers is used here as an example. For other configurations, use the same procedure starting with the highest crossover point and repeating steps 2 through 5 for each lower crossover point. NOTE: If you are running two separate channels on the crossover, tune up only one channel at a time, using the same procedure for both. Place the analyzer mic about 15 feet in front of the speaker stack and at a height about midway between the high and mid drivers. Connect the pink noise source to the crossover INPUT (or mixer or wherever is convenient). Turn up the crossover MASTER LEVEL control and the MID OUT control until noise is heard only from the mid driver at a comfortable volume. With a healthy but not uncomfortable volume of noise from the mid driver, set the analyzer DISPLAY LEVEL control so the LED's corresponding to the high crossover frequency are reading 0 dB (this would be a green LED at the crossover frequency with any of the Rane analyzers). For example, if your high crossover frequency is 2 kHz, set the RA 30 in the ±1 dB mode and then adjust the RTA LEVEL control until the green LED is lit in the 2 kHz band. Press in the MID MUTE switch on the crossover so the tone is removed from the mid driver. Without re-adjusting either the meter or the crossover Input or Mid Level controls, turn up the HIGH LEVEL control until the tone coming from the high driver reads 0 dB (a green LED at the crossover frequency). Now release the MID MUTE switch on the crossover so that pink noise is heard from both the high and mid drivers. Switch the display sensitivity to ±3 dB on Rane analyzers (not necessary with full scale analyzers) and observe the display reading at the crossover frequency: i. If the display shows a +3 dB reading, then the drivers are properly phase aligned and no delay is necessary; leave the MID DELAY control at minimum. ii. If the display shows less than +3 dB reading, slowly turn up the MID DELAY control on the crossover until the display shows +3 dB. The Delay control should be left in this position unless the speaker system is physically altered. If the MID DELAY control is all the way up and you still do not have a +3 dB (red) reading, you will have to physically move the high driver farther forward until the display shows +3 dB (red). The amount of displacement correction available from the Delay depends on the actual crossover frequency: the higher the frequency, the less amount of correction capability. [. . . ] Now press the MID MUTE switch on the crossover so that the pink noise again disappears. 8. Repeat this process for each frequency section of the crossover, ending with the highest frequency. NOTE: It is possible that you may turn one of the frequency section output LEVEL controls all the way up and still not have enough volume for a 0 dB reading (as determined by previous section levels). This is probably due to different sensitivities of amps, speakers and other level controls in the system. [. . . ]