User manual RANE AC 22

[. . . ] The model AC 22 utilizes ¼" TRS connectors with balanced/unbalanced inputs and unbalanced outputs. The new AC 22 uses XLR connectors with active balanced inputs and outputs. [. . . ] Simply put, a Linkwitz-Riley alignment is two cascaded 2nd-order Butterworth filters exhibiting identical phase characteristics on their Low pass and High pass Outputs. In-phase outputs are mandatory for proper acoustic summing of common signals from adjacent drivers in the crossover region. An added benefit of this topology is steep 24 dB per octave rolloff slopes. A slope of this magnitude guarantees drivers designed to produce a specific range of frequencies, and no more, will not be driven past their limits, thereby minimizing distortion and driver fatigue. To further guarantee the transparent operation of the AC 22 and AC 22, adjustable Delay circuits appear on the Low (& Mid when used in 3-Way mode) Outputs of each Channel to compensate for any physical misalignment of the drivers. Time correction ensures the mechanical phase alignment of adjacent drivers will be acoustically correct, thus maintaining the integrity of the electrical phase alignment of the crossover's filters. The Low Delay circuit may be internally transplanted to the High Output when neccessary. The active crossover shall afford an input level range of off to +6 dB. The output level controls shall afford a level range of from off to +6 dB (+12 dB for the AC 22) with muting capability on the low frequency outputs. The unit shall be exempt from agency safety requirements and powered from a UL listed, CSA certified remote power supply (120 VAC) or CE approved (230 VAC) via a rear panel input modular plug. The unit shall be constructed entirely from cold-rolled steel, and mount into a standard 1U EIA rack. The unit shall be a Rane Corporation AC 22 or AC 22 Active Crossover. Available Accessories · SC 1. 7 Security Cover References 1. Linkwitz, "Active Crossover Networks for Noncoincident Drivers, " J. Bohn, "A Fourth-Order State-Variable Filter for Linkwitz-Riley Active Crossover Designs, " presented at the 74th Convention of the Audio Engineering Society, New York, Oct. [. . . ] Bohn, "A Fourth-Order State-Variable Filter for Linkwitz-Riley Active Crossover Designs, " presented at the 74th Convention of the Audio Engineering Society, New York, Oct. Bohn, "Overload Characteristics of State-Variable Crossovers, " Rane Note 112, (1985). [. . . ]