User Guide

CA Series Installation & User Guide v1.2
15
Clearly better sound
Outputs
The speaker output connector for each amplier channel
is a 2-pin, 5 mm-pitch screw-terminal type
4
. The plug-in
connectors are suitable for cable cores up to 2.5 mm
2
.
Connect as shown below:
-
TO SPEAKERS -
LO-Z: 4 OR 8 OHMS
HIGH-Z: 70/100 V-LINE
+
Never make connections to the output terminals
while the amplier is powered.
The output stages of CA Series ampliers can be congured to
drive either high impedance loudspeaker distribution systems
(70 V-line or 100 V-line), or low impedance loudspeakers (4 ohms
or greater). The selection of output mode is made independently
for each amplier channel with the rear panel SPEAKER LOAD
HIGH Z/LOW Z DIP switch
6
. On Models CA2500, CA4250,
CA6160 and CA8125, this is a dedicated 2-, 4-, 6- or 8-pole
switch: on Model CA2250, output mode selection is made using
poles SW7 and SW8 of the single 8-pole DIP switch. (The rst
example shown below is for the 4-channel CA4250; the principle
is identical across the range.)
HIGH Z
SPEAKER LOAD
(CA4250)
4 ohm or
8 ohm
operation
70 V-line or
100 V-line
operation
1 2 3 4
ON
LO Z
CH2 INPUT ROUTING
APD ON/OFF
CH2 65Hz HPF
CH1 65Hz HPF
8Ω / 100V
Lo-Z
ON
ON
ON
CH1
1 2 3 4 5 6 7 8
ON
CH1 4
Ω/70V or 8Ω /100V
CH2 4
Ω/70V or 8Ω /100V
CH1 Hi-Z/Lo-Z
CH2 Hi-Z/Lo-Z
4 ohm or
8 ohm
operation
70 V-line or
100 V-line
operation
(CA2250)
4Ω / 70V
Hi-Z
OFF
OFF
OFF
CH2
The output mode may be set independently for each channel.
Set the switch UP for high impedance (70/100 V-line)
operation and DOWN for low impedance operation.
IMPORTANT: CA Series amplier channels normally
operate in a bridge conguration in both low and high-
impedance modes: pairs of channels cannot be bridged
externally to obtain a higher power output.
70/100 V-line operation
In high impedance mode, CA Series ampliers can drive
either 100 V-line or 70 V-line loudspeaker distribution
systems directly. The system voltage is set by the rear
panel SPEAKER LOAD 4Ω/70V / 8Ω/100V DIP switch
7
.
On Models CA2500, CA4250, CA6160 and CA8125, this is
a dedicated 2-, 4-, 6- or 8-pole switch: on Model CA2250,
output mode selection is made using poles SW5 and SW6 of
the single 8-pole DIP switch. (The rst example shown below
is for the 4-channel CA4250; the principle is identical across
the range.)
4Ω / 70V
(CA4250)
70 V-line
operation
1 2 3 4
ON
CH2 INPUT ROUTING
APD ON/OFF
CH2 65Hz HPF
CH1 65Hz HPF
8Ω / 100V
Lo-Z
ON
ON
ON
CH1
4Ω / 70V
Hi-Z
OFF
OFF
OFF
CH2
1 2 3 4 5 6 7 8
ON
CH1 4Ω /70V or 8Ω /100V
CH2 4Ω /70V or 8Ω /100V
CH1 Hi-Z/Lo-Z
CH2 Hi-Z/Lo-Z
70 V-line
operation
(CA2250)
8Ω / 100V
100 V-line
operation
100 V-line
operation
The voltage may be set independently for each channel. Set
the switch UP for 70 V line operation and DOWN for 100 V
line operation.
In high impedance (70/100 V-line) mode, the transformerless
output stage of each amplier channel is designed to deliver
a maximum of 500 W, as long as the other channels in the
same odd- or even-numbered group (i.e., using the same
internal power supply) are unloaded. When using multiple
channels of a CA2500, CA4250, CA6160 or CA8125 amplier,
installers should ensure that the total loading on the odd-
numbered channels does not exceed 500 W, and the total
loading on the even-numbered channels, does not exceed
500 W. Model CA2250 uses a single power supply, and the
total loading of both channels combined must not exceed
500 W.
The wattage loading for each channel, can be calculated by
adding together the tap wattage settings for all speakers
connected to that channel.