APG DMS26, User Manual

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DIGITAL MANAGEMENT SYSTEM DMS26
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System high pass filtering is provided for the input signal. This is the preferred location for high pass filtering as it affects
all outputs and can therefore improve inter-band phase relationships. Filter type is selectable from Butterworth, Bessel,
Linkwitz-Riley and Hardman. Filter slopes of up to 4th order or 24dB / octave are provided. Not all filter types are
available in all slopes. For example 18dB / octave Linkwitz-Riley filters do not exist.
The Hardman type filter is always described by its’ order as the filter becomes progressively steeper rather than following
a linear slope so a dB/octave description is not accurate.
Parametric Equalisation
Eight sections of equalisation are provided, two shelving filters and six fully variable parametric sections.
High and Low shelving filters
Knob A: Frequency, 10.0Hz to 25.6kHz in variable steps
Knob B: Slope, 6 to 12dB / octave in 1dB steps
Knob C: Gain, +/-15dB in 0.2dB steps
The frequency is specified as point where the filter deviates by 3dB from the gain value.
Parametric filters
Knob A : Centre Frequency, 10.0Hz to 25.6kHz in variable steps
Knob B : Width, display selectable, Q or BW (Bandwidth)
BW adjustable from 0.05 to 5 octaves in variable steps
Q adjustable from 14.2 to 0.2 in variable steps
Knob C : Gain, +/-15dB in 0.2dB steps