Proel PC260 - Manual (Page 19)

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For each output channel two crossover points can be set, which are named Xo1
and Xo2 . Please note that in the FLAT default preset both are set as Thru (the
signal passes thru without filtering process) .
The parameters are:
LP/HP
The crossover filter generally consists of a low pass filter in one channel and a
high pass filter in the adjacent channel .
H-pass: a high pass filter passes frequencies above the crossover point and
attenuates those below .
L-pass: a how pass filter passes frequencies below the crossover point and
attenuates those above .
As standard Xo1 is set as H-pass (HIGH-PASS) and Xo2 is set as L-pass (LOW-
PASS), but they can be set also differently .
See the figure below (note: all the following figures are taken from the PRONET
software):
TYPE
The PC260 offers a wide choice of HiPass and LoPass filters with different slopes
and responses . The Type parameter defines the characteristics of the crossover
filter:
• Butterworth: 6dB, 12dB, 18dB, 24dB, 48dB
• Bessel: 12dB, 18dB, 24dB 48dB
• Linkwitz-Riley: 12dB, 24 dB, 48dB
Each filter can be bypassed setting it as "thru".
The figures below show the various slopes with the FREQ parameter set at 1 kHz:
FREQ
Frequency offers a selectable frequency range from 20 Hz to 20 KHz .
DELAY
PC260 offers input and output delay .
Master A and B input delay is useful for compensating
different arrival times of sound originating from loudspeakers
that are closer or further away from the listener than others .
Channel 1 to 6 output delay is useful for compensating physical offsets of the
acoustic centers of transducers within a loudspeaker cabinet . For example,
due to cabinet construction, the acoustic center of a high frequency transducer
may be placed behind or in front of the acoustic center of the low frequency
transducer . The Delay parameter can align the audio signal between the
multiple transducers within the loudspeaker . The output delay can be useful
also to align the subwoofer, usually placed at ground level, with the satellite
speakers suspended . Available delay parameters are DELAY and UNITS:
The DELAY parameter allows the user to set the Delay time values (0 to
+300 .00ms or 0 to 200m/675ft) .
This figure shows the frequency spectrum of an output with Xo1 set as H-pass, Butt 24, 100Hz and Xo2 set as
L-pass, Butt 24, 1KHz all signal highlighted is cut out .
CUT OUT CUT OUT
PASS THRU
BUTTERWORTH BESSEL LINKWITz-RILEY
12
24
48
18
24
48
12 12
24
48
6
18