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1.2
SPECIFICATIONS
ELECTRICAL
(Each Channel):
INPUT:
Balanced bridging, differential amplifier.
INPUT IMPEDANCE:
20
kohms, used
as
balanced
input.
10 kohms,
used
as
unbalanced
(single-ended) input.
MAXIMUM INPUT
LEVEL:
+20 dB
maximum
(Ref.
0.775 volts rms).
MAXIMUM
GAIN:
45 dB, ±1 dB.
FREQUENCY RESPONSE:
±1 dB,
20-20,000
Hz.
OUTPUT:
Floating, transformer isolated.
OUTPUT
LOAD:
150 ohms
or greater.
MAXIMUM OUTPUT
LEVEL:
+24 dBm into 600 ohm load (12.28 volts).
+20 dB into 150 ohm load (7.75 volts).
DISTORTION:
Less than 0.5%
THD, 50 Hz to 15
kHz with
limiting, at
1.1
seconds release setting;
(as
with
all limiting devices,
distortion
of
low frequency peaks increases with
faster release
time)
.
SIGNAL TO NOISE RATIO:
Greater than
81
dB at
threshold
of limiting,
30 Hz to 15 kHz.
ATTACK TIME:
Less than
20
microseconds
for 100% recovery;
adjustable
to
800 microseconds with front-
panel control
.
RELEASE TIME:
50
milliseconds minimum,
1.1
seconds
maximum
(for 63% recovery).
Adjustable
with front-panel
control.
Input Level at
Relative
Minimum Limiting
Output
at
Threshold
±2
dB
Threshold*
-24 dB
+10 dBm
-25 dB
+9
dBm
-26 dB
+8
dBm
-30 dB
+7
dBm
*with output gain control set
to
provide
a
reserve of approximately
10 dB.
NOTE:
Throughout this manual, where the expression
"dB" is used
to denote
a
signal level, it
is
referenced to
0
dB
-
0.775 V
rms.
THRESHOLD
vs
OUTPUT LEVEL:
Compression
Ratio
Setting
20:1
12:1
8:1
4:1
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