Filter
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CHANNEL EQ1-4
The four output channels of the DSP 244 employ a 4-band parametric EQ each which allow to program
additional equalization for the individual frequency ranges. This guarantees the optimum frequency
response that is matched to the connected loudspeaker components.
Parameter Settings / Value range
Default
Type
BYPASS, PEQ, LOSLV, HISLV, HIPASS, LOPASS,
ALLPASS
BYPASS
PEQ
f
Q
Gain
20Hz - 20kHz
0.4 - 20.0
-12dB - +12dB
1.00 kHz
0.7
+0dB
LOSLV
f
Slope
Gain
20Hz - 20kHz
6dB, 12dB
-12dB - +12dB
1.00 kHz
6 dB
+0dB
HISLV
f
Slope
Gain
20Hz - 20kHz
6dB, 12dB
-12dB - +12dB
1.00 kHz
6 dB
+0dB
LOPASS
f
Slope
Q
20Hz - 20kHz
6dB, 12dB
0.4 - 2.0 (for 12dB/octave slope only)
1.00 kHz
6 dB
0.7
HIPASS
f
Slope
Q
20Hz - 20kHz
6dB, 12dB
0.4 - 2.0 (for 12dB/octave slope only)
1.00 kHz
6 dB
0.7
ALLPASS
f
Order
Q
20Hz - 20kHz
1st, 2nd
0.4 - 2.0
1.00 kHz
1st
0.7
Type describes the selected filter type. When selecting BYPASS, no effect is applied. PEQ provides a
parametric Peak Dip Filter with programmable frequency, quality, and gain. LOSLV / HISLV stand for Low
Shelving or High Shelving Equalizer, respectively. Their parameters are: frequency (f), slope, and gain.
The parameters of the LOPASS / HIPASS filters are frequency and slope. The ALLPASS filter can be
used to compensate phase differences at the x-over frequency.
f (frequency) sets the center-frequency of parametric EQ-types and the cutoff frequency of shelving and
Hi-Pass / Lo-Pass filters. With the Allpass filter this is the frequency at which the phase is shifted by 90°
(1st order Allpass) or by 180° (2nd order Allpass).
The value of the parameter Q determines the quality or bandwidth of parametric EQs. Higher Q-values
result in a narrow banded filter while smaller Q-values result in a wider bandwidth.
The Q-parameter also describes the quality and therefore the graph of the Hi-Pass and Lo-Pass filters.
The Q-parameter is also found in the 2nd order Allpass filter. It is used to set the phase response in the
transition band (lower Q-settings result in flat phase response while higher Q-settings produce a steeper
phase response; see also examples).
PARAMETERS
8-7