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Independent Operation
Bridged Operation
+
Rated
Rated
Rated RMS
Rated
Rated
Rated RMS
Power
Load
Sine-wave
Power
Load
Sine-wave
Output
Impedance
Voltage Output
Output
Impedance
Voltage Output
75watts
16ohms
35volts
150watts
32ohms
70volts
Parallel Operation
Number of Parallel Model 2275 Power Amplifiers
1
2
3
4
5
6
7
8
Rated Power Output
75watts
150watts
225watts
300watts
375watts
450 watts
525watts
600 watts
Rated Load Impedance
16ohms
Bohms
5.3ohms
4ohms
3.2 ohms
2.7 ohms
2.3ohms
2ohms
Rated RMS Sine-Wave
Voltage Output
35volts
35volts
35volts
35volts
35volts
35volts
35volts
35volts
2275's
Parallel/Bridged Operation
2275's
+
LOAD
+
2275's
LOAD
LOAD
2 SETS OF (2) 2275's (4 TOTAL)
2 SETS OF (3) 2275's (6 TOTAL)
2 SETS OF (4) 2275's (8 TOTAL)
Rated
Rated
Rated RMS
Rated
Rated
Rated RMS
Rated
Rated
Rated RMS
Power
Load
Sine-Wave
Power
Load
Sine-Wave
Power
Load
Sine-Wave
Output
Impedance
Voltage Output
Output
Impedance
Voltage Output
Output
Impedance
Voltage Output
300watts
16ohms
70volts
450watts
102/:iohms
70volts
600 watts
8ohms
70volts
Figure 9. Power Output, Impedance, and Voltage Output for Various Combinations of Model 2275 Power Amplifier Modules. Voltage specifica-
tions are based on 16 ohms load impedance. For systems modified for 8 ohms load impedance, change listed impedance values to one-half
value; change 70-volt listings to 49 volts, and 35-volt listings to 24.5 volts. For Model 2276 Power Amplifier Modules, refer to separate technical
publication (42-02-045362).
70-Volt Loudspeaker Distribution System
For 70-volt loudspeaker distribution
sys-
tems, connect the HIGH OUTPUT terminals
as described in 'Bridged Operation', and In
'Parallel/Bridged Operation'. These configu-
rations are based on 16 ohms load Im-
pedance for the main frame and for the
Model 2275 Power Ampllfier Modules.
25-Volt Loudspeaker Distribution Systems
For 25-volt loudspeaker distribution
sys-
tems, modify the main frame, and each
Model 2275 Power Amplifier Module to be
used therein, for 8-ohm load Impedance;
refer
to
'Conversion for 8-0hm
Load
Impedance. Connect HIGH and COM OUT-
PUT Terminals as described In 'Independent
Operation'and in 'Para/le/Operation'.
It
Is possible to use 16-ohm power ampllfier
modules In a main frame modified for 8-ohm
operation. However, at 25 volts output, max-
imum power available for each power amp-
lifier module is 37.5 watts per module (into
16ohms).
Independent Operation
To operate one or more power amplifier
modules independently, each module must
7
receive a separate input signal and drive a
separate loudspeaker load (Figure 10). Input
signals must be routed through a driver
module. No input signals may be routed
from an input module directly to a power
amplifier module, or from special input/out-
put Jacks J213, J214, J215, and J216 directly
to a power amplifier module.
Connect the loudspeaker load to the appro-
priate terminals of the HIGH (TB201) and
COM (TB202) OUTPUT terminal boards.
Rated load impedance for a single power
amplifier module in the independent mode
is 16 ohms (or 8 ohms in modified version).
Rated power output is 75 watts.
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