Dynacord DSP 244 owner manual Hipass X-OVER, Lopass X-OVER

P A R A M E T E R S

HIPASS X-OVER

The frequency crossover filter consists of a low pass filter in one channel and a high pass filter in the adjacent channel. Here, the frequency x-over filter’s Hi-Pass parameters are set. The parameters of the corresponding Lo-Pass should be set to the same values. An x-over filter provides the parameters “Type” and “f”.

Parameter	Settings / Value range	Default
	thru, 6 dB,
	12dB Q0.5, 12dB Q0.6, 12dB Q0.7, 12dB Q0.8,
Type	12dB Q1.0, 12dB Q1.2, 12dB Q1.5, 12dB Q2.0	thru
	Bessel 12 dB, Butter 12 dB, Linkwitz 12 dB,
	Bessel 18 dB, Butter 18 dB,
	Bessel 24 dB, Butter 24 dB, Linkwitz 24 dB
f	20Hz - 20kHz	1.00 kHz
Pol	norm, inv	norm

The Type parameter defines the filter characteristics of the x-over Hi-Pass filter. Different slopes and filter responses (6dB, 12dB with different Q values, Bessel, Butterworth, Linkwitz-Riley) are available and the filter can be bypassed. The corresponding Lo-Pass filter should be set to the same characteristics.

The f parameter (frequency) sets the x-over Hi-Pass filter’s cutoff frequency. The corresponding Lo-Pass filter should be set to the same cutoff frequency.

Pol defines the polarity of the corresponding channel. Depending on the characteristic of the frequency crossover filter, inverting the polarity of a channel’s signal may become necessary; i. e.: set a negative polarity. Some filter types generate phase responses that lead to significant level reduction in the overall audio signal at the crossover frequency. This negative effect can be eliminated by inverting the polarity of the output that carries the low-frequency signal.

The following table provides you with a list of all filter types for which a channel’s signal has to be inverted for the corresponding filter pair.

Bessel 12 dB

Butterworth 12 dB

Bessel 18 dB

Bessel 24 dB

In the Standard Edit Mode, depending on the selected type of filter, channel inversion is automatically set.

LOPASS X-OVER

The frequency crossover filter consists of a low pass filter in one channel and a high pass filter in the adjacent channel. Here, the frequency x-over filter’s Lo-Pass parameters are set. The parameters of the corresponding Hi-Pass should be set to the same values. An x-over filter provides the parameters “Type” and “f”.

Parameter	Settings / Value range	Default
	thru, 6 dB,
	12dB Q0.5, 12dB Q0.6, 12dB Q0.7, 12dB Q0.8,
Type	12dB Q1.0, 12dB Q1.2, 12dB Q1.5, 12dB Q2.0	thru
	Bessel 12 dB, Butter 12 dB, Linkwitz 12 dB,
	Bessel 18 dB, Butter 18 dB,
	Bessel 24 dB, Butter 24 dB, Linkwitz 24 dB
f	20Hz - 20kHz	1.00 kHz
Pol	norm, inv	norm

The Type parameter defines the filter characteristics of the x-over Lo-Pass filter. Different slopes and filter responses (6dB, 12dB with different Q values, Bessel, Butterworth, Linkwitz-Riley) are available and the filter can be bypassed. The corresponding Hi-Pass filter should be set to the same characteristics.

8-9