Crossover
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DME32—Owner’s Manual
Crossover
There are 12 components in the Crossover group, with 2-way, 3-way, and 4-way cross-
overs with 12 dB/octave, 24 dB/octave, 36 dB/octave, and 48 dB/octave slopes. Cross-
over 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 But-
terworth, 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.