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,-
FROM
I
INPUT
OR
I
CROSS-
OVER
I
CA
RD
I
NOT
CON-
L
NECTED
-
-
-
COM
l
DRIVER AMPLIFIERS ON
MODEL 2250 OR
2252
CARD
NOT
CO
NNECTED
TYPICA
L
PA RA
LLEUBRIDGED
CO
NNE CTION
S
TO
TWO 16Q SPEAK
ER
SYSTEMS
2 SETS OF UP TO 4 MODEL
2275
POWER AMPLIFIE
RS
PER SET RECEIVE
"
OUT OF
PHAS
E"
INPUTS AND DRIVE THE SAME
LOA
D.
Figure 13. Typical Parallel/Bridged Mode of Operation
Rated output power from two bridged power
amplifier modules is 150 watts. Rated load
impedance is 32 ohms (or 16 ohms in modi-
fied version)
.
The bridged output is a 70-volt
(or 49-volt in modified version) balanced
(non-floating)
output
which
may
drive
70-volt or 49-volt commercial sound loud-
speaker lines
.
Parallel/Bridged Operation
The parallel/bridged
mode
produces
a
70-volt (or 49-volt
in modified
version)
balanced output at a higher power level
than the simple bridged mode
.
First parallel two identical sets of power
amplifier modules as described in Parallel
Ooeration. Each set must contain the same
number of paralleled power amplifier mod-
ules (two, three, or four modules per
set).
INPUT MATRIX SWITCHES
Then, bridge the two sets of paralleled
power amplifier modules as described in
Bridged Operation, as if each set were a
single module (Figure
13).
Always bridge two sets of paralleled power
amplifier modules
;
do not parallel two sets
of bridged power amplifier modules
.
Rated power output for the parallel/bridged
mode is equal to 75 watts times the number
of power amplifier modules connected into
the configuration
.
Rated load impedance is
64 ohms (or 32 ohms in modified version)
divided by the number of power amplifier
modules in the configuration. The parallel/
bridged output is a 70-volt (or 49-volt in modi-
fied version) balanced (non-floating) output
which can drive high power 70-volt or 49-volt
commercial
sound loudspeaker
lines or
other high power
loads.
I
S103
I
I
S203
I
MODEL
2250
MODEL
2252
(/)
w
J:
(.)
I-
~
(/)
~
a:
I-
~
~
I-
::>
Q.
I-
::>
0
BRIDGING
SWITCH S202
SETUP OF DRIVER CARD MODULES
Input Sw
itching Matrix
An input switching matrix is provided for
t
he Model 2250 and 2252 Driver Card Mod-
ules
.
The Model 2251 Crossover Driver con-
tains no input switching matrix. Incoming
signals to the input switching matrix arrive
from an input card module, a Model 2251
Crossover Driver Module, or special input/
output jacks J213, J214, J215, or
J216.
Input matrix switches of the Model 2250
Driver are designated S103 and S203; for the
Model 2252 Driver, designations are S103,
S203,
S303,
and
S403.
Use the input matrix
switches to assign an input to one of the
driver amplifier circuits on the driver card
module. For example, to assign an input
from line 6 to the #1 driver amplifier circuit,
close the #6 switch of S103 in the driver in-
put switching
matrix
.
To assign an -input
from line 3 to the #2 driver ampli
f
ier circuit,
close the #3 switch of
S203.
Input switching
matrices are identical for SA type modules
.
Always leave all unused (unassigned) input
matrix switches OFF (open) to avoid possi-
.
ble misrouting of input signals.
Output Switching Matrix
An output switching matrix is provided on
all driver card modules to assign driver
amp-
lifier
circuit
outputs
to the appropriate
power amplifier modules
.
For example, to
assign the output of the #4 driver amplifier
circuit (Model 2252 Driver Module) to the
input of power amplifier module #2, close
the #2 switch of S401 in the driver output
switching matrix
.
To assign the output of
driver amplifier circuit #3 to the inputs of
power amplifier modules #5 and #6, close
the #5 and #6 switches of S301. Output
switching matrices are identical for SA type
modules.
Always leave all unused (unassigned) out-
put matrix switches OFF (open) to avoid
INPU
T
MATRIX
SWITCHES
I
S103
I
I
S203
I
I
S303
I
I
S403
I
OUTPUT
~il-??'
:r:
=--MA TRIX
SWITCHES
I
S201
I
I
S101
I
I
S401
I I
S301
I
BRIDGING
SWITCH S402
Figure
14.
Bridging and Matri
x
Switch ing for Model 2250 and 2252 Driver Modules
9
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