Yamaha DME32 DME32 Owners Manual - Page 99

Crossover 93 Crossover There are 12 components in the Crossover group, with 2-way, 3-way, and 4-way crossovers with 12 dB/octave, 24 dB/octave, 36 dB/octave, and 48 dB/octave slopes. Crossover filter types include Butterworth, Bessel, and Linkwitz-Riley, which are explained below. Bessel-A type of filter characterized by its virtually linear phase response (i.e., the amount of phase change is the same for all frequencies within the pass band). Although it has a more gradual roll off than a Butterworth filter, it will pass a square wave without causing ringing. Butterworth-Being the most common type of filter, filters are typically always Butterworth, unless otherwise stated. It has a flat pass band and a -3 dB gain at the cutoff frequency. Linkwitz-Riley-This filter offers slopes of 12 dB, 24 dB, 48 dB, etc. When the output signal from its LPF and HPF are combined, the gain over the entire range is flat. Like the Butterworth filter, it has a flat pass band. The gain at the cutoff frequency is -6 dB. Adjustable Gc-Filters with an Adjustable Gc allow you to adjust the gain at the cutoff frequency. With Gc set to -3 dB, the filter is practically a Butterworth filter. And with the SLOPE & TYPE set to 12 dB/oct Adjustable Gc, 24 dB/oct Adjustable Gc, or 48 dB/oct Adjustable Gc, and Gc set to -6 dB, the filter is practically a Linkwitz-Riley filter. With Gc settings greater than -3 dB, boost occurs around the cutoff frequency. DME32-Owner's Manual