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SYSTEM SPECIFICATIONS FOR INCREMENTAL POWER AMPLIFIERS
Voltage Ampliflcation (Maximum)
From input of Model 2220 Input Card through Model 2250 or
2252 Driver Card to output of Power Amplifier Module.
From input of Model 2220 Input Card through Model 2251
Crossover Card to output of Model 2275 Power Amplifier.
Voltage Amplification (Maximum)
From input of Model 2220 Input Card through Model 2251
Crossover Card to Special Input/Output Jacks J213, J214, or
J215.
Minimum Load Impedance
For Special Input/Output Jacks 213, 214, and 215.
Voltage Amplification (Maximum)
From special Input/Output Jacks J213, J214, J215, or J216
through 2250 or 2252 Driver Card to output of Model 2275
Power Amplifier.
Input Sensitivity
Input voltage needed at 2220 Input Card inputs for rated output
from Model 2275 Power Amplifier with 2250 or 2252 Driver
Card.
Input Sensitivity
Input voltage needed at 2220 Input Card inputs for rated output
from Model 2275 Power Amplifier with Model 2251 Crossover
Card.
Input Impedance
35.0 dB in independent or parallel mode, 41.0 dB in bridge or parallel/
bridge mode (all attenuators at full CW rotation).
35
o
dB to output of Power Amplifier Modules assigned to the "Low"
ou.tput of the 2251 Crossover Card: 36.7 dB to output of Power Amplifier
Modules assigned to the "Mid" output of the 2251 Crossover Card; 47.0
dB in Biamplifier, 50.6 dB in Tri-Amplifier to output of 2275 Power
Amplifier Modules assigned to the "High" output of the 2251 Crossover
Card; 35.0 dB to output of power amplifier in biamplifier mode using full
range channel (MF channel of 2251 driver). (Values apply to Power
Amplifier Modules in independent or parallel mode; add 6 dB to values
for Power Amplifier Modules used in bridge or parallel/bridge modes; all
values assume full CW rotation of appropriate attenuators.)
+
15.0 dB to J213 ("High" output);
+
11.5 dB to J214 ("Mid" output);
- 0.5 dB to J215 ("Low" output). (All attenuators at full CW rotation.)
300 ohms.
35.0 dB in independent or parallel mode; 41.0 dB in bridge or parallel/
bridge mode.
(All attenuators at full CW rotation.)
- 2.0 dB* (0.61V) for 16Q operation, - 4.9 dB (0.44V) for 8Q operation
with appropriate attenuators at maximum CW rotation; Input Sensitivity
is the same for all operational modes of Power Amplifier Modules.
- 2.0 dB (0.61V) for 16Q operation, - 4.9 dB (0.44V) for 8Q operation
with appropriate attenuators at maximum CW rotation; Input Sensitivity
is the same for all operational modes of Power Amplifier Modules.
At Special Input/Output Jacks J213, J214, J215, J216 with
29K ohms.
Model 2250 or 2252 Driver Card.
Input Sensitivity
Input Voltage needed at Special Input/Output Jacks J213, J214,
J215 or J216 for maximum output from Model 2275 Power
Amplifier with 2250 or 2252 Driver Card.
AC Power Requirements
(2200 Main Frame with 8-Model 2275 Power Amplifiers, Model
2221 Input Card, Model 2252 Driver Card.)
Export Conversion Voltages
Connectors (Main Frame)
Controls and Indicators
(Model 2220 Main Frame)
- 2.0 dB (0.61V) for 16Q operation, - 4.9 dB (0.44V) for 8Q operation with
appropriate attenuators at maximum CW rotation; Input Sensitivity is
the same for all operational modes of Power Amplifier Modules.
120V AC, 50 or 60 Hz; 1100 WAC line power at full power (600 W) output.
1 kHz input: 660W AC line power at 1/3 power (200W) output, 1 kHz input:
360W AC line power at 1/10 power output (60W or - 10 dB from full out-
put power), pink noise input.
100, 120, 200, 220, 240V AC, 50 or 60 Hz
(4) D3F Channel 1-4 Input Connectors. (XLR-type three-pin female.) (8)
1/4" TS Phone Jack Input Connectors (in pairs with each pair corresp-
onding to an input channel). (4) 1/4" TRS (stereo) Phone Jack Special
Input/Output
connectors.
(2) Eight-position
terminal
blocks, (one
"HIGH",
one, "COM") corresponding
to the outputs of the eight
possible Model 2275 Power Amplifiers. (1) Three-pin (grounded) AC
power cable connector. (8) 10-position card-edge connectors for up to
eight Model 2275 Power Amplifiers or four Model 2276 Power Amplifiers.
(3) 28-position card-edge connectors for the Input, Driver and Crossover
Cards.
(1) Combination AC-power-switch/circuit-breaker/pilot-lamp.
• In these specifications, when dB represents a specific voltage, O dB Is referenced to 0.775 volts rms. 'dB' is a voltage level, whereas
'~bm' is a power level. 0 dB_m is rl:'ferenced to 1 mW (0.775 volts driving a 600-ohm termination).
For example, when 6.16 volts drives a
high Impedance, the level Is designated
+
18 dB. When 6.16 volts drives a 600-ohm termination, the level is designated
+
18 dBm.
17
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