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PUSH-ON TERMINAL CONNE
CTORS
SHIELD
r-+-+---
±
SIGNAL
"----tf--....._ __
±
SIGNAL
........ _
___
--\--j,__
__
coMMON
J213, J214,
J215,J216
SHIELD
191--
- 1+--(-)-
__ ..,,_
_,__ __
(+)--
®
SHIELD
:- S~G;AL
COMMON
----
J205 THAU J212
UN BAL INPUT
CH-1 thru CH-4
Connect balanced input signals
to
channels 1 through 4,
BAL Receptacles respectively
.
Channels
1 and
3
are dedicated
to
the
electronic crossover option.
XLR-type
receptacles
.
2
UNBAL Phone
Jacks
3
J213, J214,
J215
and J216 Special
Input/Output
Jacks
4
OUTPUT
Terminals
Connec
t
unbalanced signals to
cha
nnels 1 through 4. One
pair of jacks
are wired
in parallel
for each channel.
Standard ¼"
t
ip and sleeve phon
e jacks.
Connec
t
eight
unbalanced
inpu
t
signals directly
to the
driver modules
.
Tip and ring car
ry
separate input signals
.
Sleeve is com mon. Do not use sta ndard phone plugs (tip and
sleeve),
as this will short-circu
it
internal wi
ring.
Standard
¼
" stereo (ring, tip and sleeve) phone jacks
.
Connect
outputs
of power modul
es
to the loudspeaker
system. Eight sets of HIGH
and
COM ¼"
push-on type
terminal
connectors
correspond
to
eight power amplifier
module positio ns in the main frame
.
Figure
8.
Input and Output Connectio ns
at
Main Frame
Up to eight unbalanced inputs may be con
-
nected to special input/output jacks J213,
J214, J215, and J216, using stereo (tip, ring,
and sleeve) phone plugs. Two inputs con-
nect to each jack, with tip and ring carryi ng
separate signals with respect to the com-
mon sleeve. These input signals are appl ied
directly to
the dri
ver modules and may be
controlled by
the
attenua
l
ors on the Model
2250 or
2252
Driver Modules
.
Since these
special inpu
t
s bypass the input module, it is
not necess
ary
to install an input module if
no
ot
her inp
uts
are connected to the
·
main
frame.
6
.--
-
-----NO
TE-------
Although
a total of 8 unbalanced
inputs
may be applied to special
input/output
jacks J213, J214,
J215,
and J216, this doe
s
not imply that
these 8 inputs plus
a
number of addi-
tional inputs may
be
applied through
the input card mod ules. Each Incre
-
mental Power Syste
m
may process a
max
imum
of 8 c hannels
through
separate paths
havi
ng independent
level controls
.
Balanced Inputs
For balanced
input
signals,
install
the
Model 2221 Balanced
Inp
ut Card Module in
the input module slot of the main frame
.
Connect up to four balanced input signal
cables to the BAL IN PUT connectors
of
channels CH-1,
CH-2, CH-3,
and CH-4. Wir-
ing of the XLR-3 type balanced connector is
shown in Figure 8.
The four pairs of UNBAL INPUT phone
jacks, adjacen
t
to the BAL INPUT con-
nectors, receive signals
f
rom the secondary
of the module input transformers. These
phone jacks may be
used
to feed a second
Incremental Power Syst em, a Model 9440
Power Amplifier, or other device
.
Balanced inputs may no
t
be connected to
special input/output jack
s
J213, J214, J215,
or
J216.
These special j acks are intended
for use only with unbala nced connections.
However
,
balanced signa ls from the Model
2221 Input Module may
be
routed through a
driver input matrix to appear as an un-
balanced signal at thes
e
special jacks
.
A
study of the modular blo ck diagram will in-
dicate a variety of possibl
e
configurations.
OUTPUT CONNECTIONS
(MODEL2275 ONLY)
~----CAUTIO
N
-----~
This section applies only where the
Model 2275 Power Amp lifier Modules
are used
.
Refer to tec hnical publica-
tion 42-02-045362, Model 2276 Power
Amplifier Module, for appropriate out-
put connections regard ing the Model
2276.
Output connections
from
t
he power amp-
lifier modules are made at the OUTPUT
HIGH and COM terminals on the rear panel
of the main frame
.
Figure 9 illustrates
var-
ious output configurations
for independent,
parallel,
bridged,
and
parallel-bridged
modes of operation. Note
t
hat the voltage
specifications
given in Fig ure 9 enable
cal-
culation
of
power deliv ered to a loud-
speaker system where lou
ds
peaker load im-
pedance is higher than t
he
rated load im-
pedance listed, where
:
Power (V
x
A)
=
(Voltage)
2
+
Impedance
Voltage specifications
give
n
in Figure 9 are
based on 16 ohms load im pedance for the
Incremental Power Syste
m.
If a system is
modified fo
r
a load imped ance of 8 ohms,
impedance values of Fig ure 9 must be
halved
.
At the same time, th
e
70-volt specifi-
cations must be changed
t
o
49 volts, and
the 35-volt specifications
changed to 24.5
volts.
Use the Modular Block Diagram to deter-
mine all necessary input/ output connec-
tions, and to determine set-up of all driver
switching matrices for the desired output
conf iguration.
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