User manual RANE SAC 23

[. . . ] The MONO SUB LEVEL adjusts only this Output and is not affected by the LOW LEVEL control. When using a single mono bass bin along with stereo mid- and highrange cabinets, set the 100 Hz FILTER to OUT, allowing the front panel FREQUENCY to control the subwoofer crossover point. When used with 3-way cabinets and a subwoofer, set the 100 Hz FILTER switch to IN to allow only frequencies below 100 Hz at this output jack. This way, the SAC 23 almost does the job of a Stereo 4-Way crossover, but without removing that awesome bass from the Left and Right Low Outputs. WEAR PARTS: This product contains no wear parts. Manual-1 FRONT PANEL DESCRIPTION INPUT 4 2 0 10 6 8 MONO SUB 4 2 0 10 6 8 LOW 4 6 8 0 10 200 0 dB 160 125 100 85 250 31 0 dB 2 80 Hz LEVEL +4 dBu OL LEVEL LEVEL LOW / M INPUT LEVEL control and indicators This controls the overall level without altering the relative settings of the Low, Mid and High frequency Outputs. [. . . ] Even with 31 choices it is possible that the exact recommended crossover frequency may not fall on one of the selector detents. Not to panic, for drivers have their own gradual rolloffs and tolerance variations. 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. If at all possible, always use some kind of realtime analyzer to tune your crossover, and then fine-tune each system with an equalizer. 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. 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. The FixltWithTheCrossover School Here the crossover knobs get a good workout, for the crossover is used at each location to help flatten the system along with the equalizer. Regardless of which school you profess, the absolute importance and effectiveness of some kind of realtime analyzer in your system cannot be overstressed!An analyzer saves tremendous amounts of time and provides the absolute consistency, accuracy, and plain old good sound that very few ears on this earth can deliver. [. . . ] THIS WILL SHORT SIGNAL PATH TO GROUND CAUSING A LOW DISTORTED SIGNAL TO ALL OUTPUTS. 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. [. . . ]