4081 User Manual
Issue 3
Technical / Physical Information
Dimensions
19" Rack
Mount
Width mm
(inches)
Height mm
(inches)
Depth mm
(inches)
2 units plus
fixing brackets
218
(8½)
88.2
(3½)
267
(10½)
Power Requirements
External Power supply Rated Voltage
100 – 240V AC
External Power supply Rated Frequency
50 - 60 Hz
External Power supply Rated Current
1.9A Max
Fuse (inside the 4081):
Input voltage
48V DC
Fuse rating / type
1A
(20mm x 5mm)
Location
FS1
Mains Power
The power supply is universal input type and therefore no mains operating
voltage setting is required.
Technical Earth
When switched on, internally connects zero volts to the unit chassis.
Audio Specification
Mic Input
XLR input, Z in 1Kohm @ 1kHz
Gain +20 dB to +70 dB in 5dB steps
Maximum mic
input level
(with Pad)
+24dB
Outputs
Max +26dB into 600 ohms,
Z out 50 ohms +/-5% @ 1kHz, balanced
Distortion
<0.07% for 20dBm output from
50Hz to 10kHz @ 60dB Gain
Equivalent Input
Noise
>-123dBm 20Hz to 20kHz @60dB Gain
Line Input
Z in 50k ohm, unity gain,
electronically balanced
- 30 -
