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7300 STEREO POWER AMPLIFIER
Installation
LOADS
Hote
1,
Not rlcomm.nded rar cable run, Ollt( 100 fI l30ml
Nole 2, Not recomm.nded for etble run. over I
fI
(2ml
CH.2
Dual Mode
CH.1
CH.2
--
_ _ HIGHS
~
Compresslon
Driver
f - . - - - - - - 1 +
FIGURE 3 - Typical Input Connections
4.
INSTALLATION
4A.
Operating Cautions
a.
Da not operate the amplifier in a completely c1osed,
unventilated housing.
b. Da not connect the outputs of the channels in parallel.
c.
Da not connect the output terminals to a battery, power
supply, or the power mains. Damage caused by such
hookup is not covered by the warranty.
d. Be careful when making connections, selecting signal
sources and controlling the output level.
e.
Da not ite the input signal ground to the ground lead
of an output. Ground-loop-induced oscillations may
occur.
f.
Ensure that the main ac power is within 10% of
selected voltage and frequency. Failure to operate the
unit within these limits voids the warranty.
g. Use only the proper size'mains fuse for the selected
ac voltage.
h.
Da not connect either side of the loudspeaker cable
to ground when operating the unit in bridged mode.
The bridged mode is balanced to ground.
i.
Make certain that test equipment is not graund
referenced when testing the unit in the bridged mode.
j.
Tampering with the circuit er repair by unauthorized
personnel will void the warranty of the unit.
slx
FIGURE 4 - Typical Output Connections
4B.
Input Connections
Two conductor shielded low-impedance cable is recom-
mended for input lines to the amplifier input. Pin 2 Of the
XLR·type connector is high (+), pin 3 is low (-), and
pin 1 is ground. The V4-inch jack may be used as a low
impedance input. Tip is high (+), ring is low (-). and the
sleeve is ground. See Figure 3.
High impedance lines may be connected to the amplifier
inputs with a single-conductor low capacitance sheilded
cable of 30 feet or less in iength. A two conductor 1/4-inch
plug will automatically unbalance the input. To help avoid
hum or buzz in the output, be certain that all input cables
fre physically separated from power wiring er power
transformers.
4C.
Output Connections
Binding posts are provided for speaker terminations, the red
post is high (
+)
and the black post is low ( - ). The preferred
connector is a high quality dual banana plug. See Figure 4
for typical output configurations.
Before making output connections, the input attenuators
should be turned off (full counterclockwise), doing so will
eliminate any chance of loud blasts cr damage to the
loudspeaker.
Power loss in the speaker wire. The impedance of the
speaker connecting wire would ideally be zero, so all of the
amplifier output power would be delivered to the speaker
load. However, the impedance of the speaker wire can
become a significant percentage of the speaker impedance.
Thus, part of the amplifier power is "lost" in the wire (in the
form of heat) and the power delivered to the speaker system
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