Advertisement
HIGH
16Q
+
.------OUTPUT----,
FROM
DRIVER OR
CROSSOVER
CARDS
COM
i-t-+---}
16Q
J:i;~~t-1----}16Q
1 TO 8 MODEL 2275 POWER
AMPLIFIERS RECEIVE
SEPARATE
INPUTS AND
DRIVE
SEPARATE
LOADS.
}--I-+--- }
16Q
} 16Q
16Q
~~iil!}-•-1-f-_l-~------}1sQ
FROM
DRIVER OR
CROSSOVER
CARDS
FROM
DRIVER OR
CROSSOVER
CARDS
TYPICAL CONNECTIONS FOR
5 INDEPENDENT SPEAKERS
Figure 10. Typical Independent Mode of Operation
1
TO
8
MODEL 2275 POWER
AMPLIFIERS RECEIVE
THE SAME INPUT AND
DRIVE THE SAME LOAD.
TYPICAL CONNECTIONS FOR 4 PARALLEL
AMPLIFIERS TO 4Q SPEAKER SYSTEM
Figure 11. Typical Parallel Mode of Operation
,-----OUTPUT----,
HIGH
NO CON-
NECTION TO
COM
TERMINALS
FROM
INPUT
OR
CROSS-
OVER
CARD
Ja--31E-+-if---}
32Q
NOT
CON-
NECTED
-
-
-
_J
DRIVER AMPLFIERS ON
MODEL 2250 OR 2252 CARD
I
NOT
CONNECTED
2 MODEL 2275 POWER AMPLIFIERS RECEIVE OUT-OF-PHASE INPUTS
AND DRIVE THE SAME LOAD.
TYPICAL BRIDGED
CONNECTIONS TO
THREE32Q
SPEAKER SYSTEMS
Figure 12. Typical Bridged Mode of Operation
8
} 32Q
Parallel Operation
Up to eight power amplifier modules may be
paralleled. Parallel power amplifier modules
must
receive one (common) input signal and
drive one (common) loudspeaker load (Fig-
ure 11).
Route a single input signal to the power
amplifier modules by closing the correct
switches of the driver module switching
matrix. Parallel outputs of the desired num-
ber of power amplifier modules by con-
necting jumper bars (supplied with the ac-
cessory kit) to the HIGH and the COM
terminals.
.-------CAUTION------.
If the outputs of two or more power
amplifier modules are paralleled, the
inputs to the same modules also
must be paralleled by closing the
proper switches of the driver output
switching matrix. Mismatched (non-
parallel) or unassigned input paths to
power amplifier modules having par-
alleled outputs may cause fuses to
blow within the modules.
Connect the loudspeaker load to the par-
alleled HIGH terminals and paralleled COM
terminals.
Rated power output in the parallel mode is
75 watts x (number of parallel power amp-
lifier modules). Rated load impedance is 16
ohms (or 8 ohms in modified version),
divided by the number of parallel power
amplifier modules.
Bridged Operation
Bridged operation
requires that 'out-of.
phase' signals must be applied to the inputs
of the two power amplifier modules to be
used in this mode. The input to the first
module must be inverted and applied to the
second module. See Figure 12. This in-
version may be accomplished with either
the Model 2250 or 2252 Driver Module. The
Model 2251 Crossover Driver Module may
not be used to accomplish this Inversion.
Route the input signal to the first driver
amplifier circuit by closing the appropriate
switch of the driver input switching matrix.
Close bridging switch S202; this applies the
input signal to the 'inverting input' of the
second driver amplifier circuit.
Do not
assign any input signal to the normal (non-
inverting) input of the second driver amp-
lifier ciruit with the driver input switching
matrix; in addition, turn the input attenuator
of the second driver amplifier circuit fully
counterclockwise to minimum level; for SA
type driver modules, set all rocker switches
to the right for maximum attenuation of 63
dB. Route the output of the first driver amp-
lifier circuit to the Input of one power amp-
lifier module by closing the appropriate
switch
of the driver output
switching
matrix. Route the output of the second
driver amplifier circuit to. the input of an-
other power amplifier module by closing the
appropriate matrix switch. Connect the
loudspeaker load to the HIGH OUTPUT ter-
minals of the two power amplifier modules.
Do not connect the loudspeaker load to the
COM terminals.
Advertisement
