User manual RANE SAC 23

[. . . ] Now, feed the SAC 23 some program material. Start by turning up the LOW LEVEL, MID LEVEL and HIGH LEVEL to the 0 dB marks. Slowly increase the INPUT LEVEL, even if it goes all the way to 10, so the +4 dBu (green) light blinks occasionally and the OL (red) light stays out. This delivers the best signal-to-noise performance. [. . . ] Not to panic, for drivers have their own gradual rolloffs and tolerance variations. When in doubt, choose the higher frequency setting. For best overall system results, try to choose the speaker components so that each operates well within its recommended limits. This provides valuable leeway so that crossover points may be adjusted in order to fine-tune the system. This also yields higher system reliability. If at all possible, always use some kind of realtime analyzer to tune your crossover, and then fine-tune each system with an equalizer. Keep reading for further alignment details. Setting the Output Level Controls The INPUT LEVEL is an overall system sensitivity adjustment. Use this control to decrease the overall sensitivity of the entire sound system, including the mono subwoofer if you are using one. You will generally want to start with this control in the full clockwise (or "10") position. The LOW, MID, HIGH, and MONO SUB OUTPUT LEVEL controls allow you to compensate for sensitivity variations in amplifiers and drivers. Do not use these to adjust overall system sensitivity unless you plan to re-align the system afterward. With these set to the 0 dB mark and the INPUT LEVEL set to 10, the crossover yields no level change from input to output. This is the best gain structure and provides the best signal-to-noise performance. Crossover Philosophy Now it gets real fun. The idea is to set the output LEVEL controls on the crossover so that the entire speaker system has a uniform, flat response. Unfortunately, the room in which the speakers are placed has a habit of always getting into the act, so things get messy. As a result there seems to be two schools of thought regarding the use of active crossovers. The SetltOnceAndGluelt School The philosophy here is to use the crossover to flatten system response as much as possible without room acoustics involved. This means setting up the system outside (unless you happen to have a very large anechoic chamber handy) and with the aid of a realtime analyzer and pink noise source, adjust all of the crossover outputs so that the system is as flat as possible. Once the system is tuned, the crossover is then locked behind a security cover (posted guard is optional) and never again touched. It is then the job of the system equalizer(s) to normalize or flatten the response for each different room. [. . . ] INSTALL IN UNUSED INPUTS ONLY. * MONO OUTPUTS PLUGGING ONLY INTO LEFT YIELDS L+R OUTPUT. PLUGGING INTO BOTH YIELDS STEREO OUTPUT. MAIN OUTPUTS L UNBALANCED MONO * L FULLY BALANCED BOOTH OUTPUT R -6 R -22 0 BALANCED OUTPUT 1: COMMON 2: POSITIVE 3: NEGATIVE CASE: CHASSIS DO NOT SHORT PIN 3 TO GND!USE ONLY PIN 2 AND PIN 1 FOR UNBALANCED SYSTEMS LIGHT CONTROL OUTPUT MP 24z MADE IN U. S. A. RANE CORP. MAIN MIC MONO TRANSFORMER COUPLED MIC 1: COMMON 2: POSITIVE 3: NEGATIVE CASE: CHASSIS AUX MIC (HI-Z ONLY) BAL/UNBAL dB L UNBALANCED 2 USE FOR WIRELESS MICS 4 6 8 0 10 MIC LOOP TIP=SEND RING=RETURN PHANTOM POWER +15V MAX OUTPUT GAIN REDUCTION R POWER 6V 10V SIG GND LIFT 750mA CLASS 2 EQUIPMENT CHASSIS GND 5V 4V 3. 5V 2. 5V 1. 7V 1V OFF 0. 6V LIGHT OUTPUT LEVEL ACTIVE DEFEAT OUTPUTS BOOTH DUCKER INPUTS LEFT RIGHT LEFT RIGHT METER SENSITIVITY ADJUST 0 LEVEL 10 0 LEVEL 10 MP 24z MIXER BRIDGED OR MONO AMP, SUB MONO SUBWOOFER Connect as shown for a mono subwoofer. [. . . ]