The AC 22B active crossover is configurable as stereo 2-way or mono 3-way. The unit employs state-variable 4th order Linkwitz-Riley filter alignments to minimize phase difficulties in the critical crossover region. Inputs and outputs are on XLR balnced connectors.
The Linkwitz-Riley alignment of the AC 22B is two cascaded 2nd-order Butterworth filters, exhibiting identical phase characteristics on their low pass and high pass outputs. This guarantees in-phase outputs at all frequencies, mandatory for proper acoustic summing of common signals from adjacent drivers in the crossover region. Steep 24dB per octave rolloff slopes will guarantee that drivers designed to produce a specific range of frequencies, will not be driven past their limits, thereby minimizing distortion and driver fatigue.
To further enhance the transparent operation of the AC 22B, adjustable time delay circuits are provided on the low (and 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. The low delay circuit may be internally switched to the high output when necessary. CD horn equalization is also possible with an internal modification. A mono subwoofer switch provides the option to sum both low outputs in stereo 2-way mode.
- Mode switch for stereo 2-way or mono 3-way operation
- 24dB per octave filters
- Low frequency mute switch removes all signal from the low output in the appropriate channel, easing tune-up procedures
- Low Frequency Time Delay
- Control adds from 0 to 2 ms of time delay to the low output. This allows a low frequency driver to be electronically phase-aligned with a high frequency driver whose diaphragm is situated behind the low frequency diaphragm
- Fully active balanced inputs and outputs on XLR connectors
- Low frequency summed (subwoofer) output
- Input and output level controls
- Individual level controls on all outputs