GUARDIAN CX4 MKIII TECHNICAL SPECIFICATION
Gain
Normal operation, unity gain +0dB -1dB
Frequency Response
20Hz - 20KHz + 0.5dB -1dB
Distortion THD @ 1KHz
O/P +20dBU <.015% (Typically .007%)
Noise
< -90dBU EIN
Inputs
Balanced
Connector type
XLR
Input impedance
> 30K Ohms
Max input level
+22dBU
Outputs
Electronically balanced
Connector type
XLR
Max O/P level
+22dBU into 600R load
Controls
Situated behind removable front panel (counting from the left)
1
Priority input level all channels.
2
Priority input level channels 3&4 (allows chans 3&4 to be lower than chans1&2)
3
Attenuation channels 1&2. Range 0dB to
–60dB (factory setting –20dB)
4
Attenuation channels 3&4. Range 0dB to
–60dB (factory setting –20dB)
5
Peak threshold 1&2 setting of peak limiter above the average limit threshold
6
Limit threshold 1&2 (average) adjustable range -20dBU to +22dBU
7
DIM limit threshold 1&2 limit threshold
8
Peak threshold 3&4 setting of peak limiter above the average limit threshold
9
Limit threshold 3&4 (average) adjustable range -20dBU to +22dBU
10
DIM limit threshold 3&4 limit threshold
11
Reset momentary action push button (adjacent jumper position determines
the type of reset - auto or manual.
12
Test momentary action push button. (For set-up and testing)
Priority input
Internally selectable Mic
– Line (18V Phantom power available on a jumper).
Connector type
XLR in and out
Set to Mic
Low impedance. Balanced. Max gain 70dB
Set to Line
10K Balanced. Max I/P level +30dBU
Visual indicators
Power -
2 x
Green LED’s.
Limit
2 x Red LED’s.
Peak -
2 x Amber LED’s.
Dim -
2 x Red LED’s.
Priority override -
Red LED.
Control input
Pins 1 & 2 18V - 24V DC ( Voltage mode)/Isolated switch contacts (Switch Auxiliary
connections
2 x 6 Way screw terminal connector mode)
Security loop
Pins 3&4 channels 1&2, Pins 5 & 6 channels 3&4. Break to trigger
Remote indicator outputs
A & G N/C
B & H Dim LED +VE
C & I Limit LED +VE
D & J Peak LED +VE
E & K Priority LED +VE F & L Common 0VE
Outputs will drive LED’s without series resistors (or suitable solid state relays to drive mains voltage indicators).
Dimensions
19" rack mounting. 1RU, Width 482mm (19"), Depth 206mm (8.1"), Height 44mm (1.75")
Finish:-
Front - and Rear panels- Black anodised aluminium with silver notation which will not rub off in
use. Case - black plastic coated steel.
Power
IEC Connector 220 - 240V AC. Mains Fuse 250mA Anti Surge (slow blow)
110
– 120V AC. Mains fuse 500mA Anti Surge (slow blow)
