CP32
Owner's Manual v 2.3 ©2000 ARX®
CP32
Owner's Manual v 2.3 ©2000 ARX®
4
5
Front panel controls
• AC power status LED
Rear Panel Connectors
• Balanced XLR Input socket. Pin 2 HOT +, Pin 3 Cold -, Pin 1 GROUND
• Balanced XLR Low Frequency Output socket (same wiring as Input)
• Balanced XLR High Frequency Output socket (same wiring as Input)
• High Frequency EQ trim
• High Frequency level trim
(Left, Centre and Right channels have identical connectors and controls)
• IEC 3 pin AC connector and integral fuseholder. Replace fuse with correct
value only: 100 - 120 V AC 1 amp, 220-240 V AC 0.5 amp. Please also refer to
voltage details on Page 2
Changing CP 32 Performance Parameters
• Crossover Frequency
Unless ordered specifically from the Factory the CP 32 is preset at a Crosso-
ver Frequency of 500HZ on all three channels. To vary the frequency the
values of RX1, RX2, RX3 & RX4 must be altered. Luckily these are all identi-
cal values so the operation is not overly complicated.
The technically minded can work out the values using the following
formula:
1
RX1,2,3,4 = 6.28 x (3.9 x 10
-9
) x Crossover Frequency in Hz
However, standard frequencies use the following resistor values:
Frequency
RX1,RX2,RX3,RX4
250 Hz
163K Ohm
500 Hz
82K Ohm
800 Hz
51K Ohm
1 KHz
40K Ohm
• Low Frequency Equalisation.
Some Low Frequency Systems (especially those derived from Thiele Small
alignments) now require the use of low frequency equalisation to achieve
smooth frequency response. The CP 32 is supplied with this equalisation set
flat with the highpass set at 40Hz. To vary this parameter use the following
scale:
6dB boost at
R11, RA11, RB11
R10, RA10, RB10
25Hz
18K Ohm
280K Ohm
32Hz
13K Ohm
220K Ohm
35Hz
12K Ohm
200K Ohm
40Hz
10K Ohm
180K Ohm
45Hz
9K Ohm
150K Ohm
50Hz
7.5K Ohm
140K Ohm
60Hz
7K Ohm
120K Ohm
