User manual RANE FAC 24

[. . . ] OPERATING / SERVICE MANUAL FAC 24/28 QUICK START No one likes to read manuals. That's usuallv OK and with only a very few exceptions, damage is unlikely to result from such procedures when initiating the use of a FAC 24/28. It is a good idea to begin with all level controls set to their full counterclockwise position. Unless you are certain that there is an electrical inversion in one of your amplifiers or drivers, set both "POS INV" switches to their "POS" positions. [. . . ] This should be set based on the horn manufacturer's recommendation. This rotary control offers 24 precise frequencies at which the crossover makes the divide between the high and low outputs. It is a binary encoding switch which sets up the digital control of the filter's frequency dividing circuits for very high precision. In its "OUT" position, the phase control has no effect on the low frequency output. This rotary control provides a constantly variable 0 to 180 degree phase shift between the low and high outputs. This red LED illuminates any time the Low Output comes within 4 dB of clipping. This level is a function of input level as well as low frequency output level. This rotary control wits the output gain of the low frequency section from Off to +6 dB. This switch electrically inverts the polarity of the low output in the "INV" position. This may be necessary for many of the same reasons cited in #5, above. Identical to #6, above with the exception that it mutes the low output. Illuminates whenever the correct AC power is applied to the unit from a remote power supply. REAR PANEL DESCRIPTION 1. l/4" INPUT CONNECTOR A balanced/unbalanced input, the tip is positive, ring is negative and sleeve is ground. the tip as hot and the sleeve as ground. You may use a TRS or "mono" connector. If the former is used, the ring may be left open or shorted to sleeve. 3-PIN INPUT CONNECTOR Pin 2 is positive, pin 3 is negative and pin 1 is signal ground. For unbalanced operation, drive pin 2 as hot and 1 as ground. 1/4" HIGH FREQUENCY OUTPUT CONNECTOR This l/4" TRS connector parallels the 3-pin connector featured in item #4. Tip is positive, Ring is negative and Sleeve is signal ground 4. [. . . ] The fourth order version exhibits rolloffs of 24 dB per octate the FAC 28 a steeper 48 dB per octave. In both cases, at the crossover frequency the high and low outputs are 6 dB down from unity and in phase. The result is a combined output which is completely flat from one end of the audio spectrum to the other. The important element here is that the outputs be in phase. [. . . ]