Crown Audio P.I.P.-AMCb - Manual (Page 8)

P.I.P.–AMCb
Page 8
FREQUENCY (Hz)
100 1 K 2 10
+6
0
–6
dB
FLAT
Fig. 3.6 Constant-Directivity Horn EQ Settings
Constant-Directivity Horn EQ
After the crossover, the high-fre-
quency band is equalized for the in-
herent roll-off in constant-directivity
horns. Both a first-order shelving net-
work and a second-order low pass fil-
ter are provided.
The +3 dB frequency of the shelving
network is set by switches 7, 8 and 9
of the “HI EQ” DIP switch (see Figure
2.1). Switches 1-6 set the –3 dB roll-
off frequency of the low-pass filter.
Overall equalizer boost is a combi-
nation of the shelving and roll-off fil-
ters (see Figures 3.7a and 3.7b).
Notice that the shelving network can
be disabled (set to FLAT) but the low
pass filter is always active.
Note: When the –3 dB roll-off fre-
quency is set to 28 kHz, the signal
will be –1 dB at 20 kHz.
Figures 3.6, 3.7a and 3.7b show the
switch settings and their respective
response curves.
Fig. 3.5 Low-Frequency EQ Response Curves
CONSTANT-DIRECTIVITY HORN EQUALIZATION
Switch Settings –3 dB Roll–Off
Frequency (kHz)
OFF
OFF
OFF
OFF
12
15
16
18
22
25
26
28
ON
ON
ON
ON
1
OFF
OFF
OFF
OFF
ON
ON
ON
ON
2
OFF
OFF
OFF
OFF
ON
ON
ON
ON
3 4 5 6
OFF
OFF
OFF
OFF
ON
ON
ON
ON
7
OFF
OFF
OFF
OFF
ON
ON
ON
ON
8 9
OFF
OFF
OFF
OFF
ON
ON
ON
ON
+3 dB Shelving
Frequency (kHz)
1.8
2.2
2.4
3.2
4.0
6.8
10
FLAT
OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON