Connections
Speakers
70V "Transformer-Coupled" Speakers
The Black Max series was designed to drive only 70V constant voltage
type speaker loads. The use of low-impedance speakers may cause the
amplifier to engage its protection circuits and shut down or limit ampli-
fier function. The speaker terminals can accept up to a #
1
0 AWG wire
or spade lug and have integral clamping plates which make wiring easi-
er. The polarity of each set of speaker outputs (A & B) is indicated with
a "+" and "-" sign. Use these indicators to ensure that the phasing of the
speakers are correct. Do not ground the "+" output of either set of out-
puts. Doing so will cause the amplifier to go into protect mode, shutting
down operation of the affected channel.
Note:
The "+" and "-" indicators are mirrored on "A" and "B" outputs.
Be sure to make the correct connections.
Earth Ground Terminal
The earth ground terminal is provided as a convenient means to con-
nect to the amplifier’s chassis/AC ground, if necessary.
DO NOT
con-
nect the earth ground terminal to the "+" terminals of either output. No
damage will occur if this is done, but the amplifier will go into protect
mode and shut down the affected channel.
Inputs
Balanced Input Connections
Balanced input connections are used when the
source device provides a balanced output (signal
"+", signal "-", and ground "G"). This type of con-
nection is desirable when operating in electrically
noisy environments, where long input cable runs
are needed, or to ensure the lowest noise opera-
tion. If compatible with the source device, this type
of connection is recommended.
Unbalanced Input Connections
When the source device provides only an unbal-
anced output (signal and ground), the input should
be wired with "-" input shorted to ground ("G").
The unbalanced signal's shield wire is connected to
ground and the signal hot wire is connected to the
"+" terminal. Since unbalanced connections do not
provide the same amount of noise immunity that a
balanced connection does, the connection distances
should be made as short as possible.
AC Power
20A AC Receptacle
The X600 line cord requires a 20A,
1
25V AC power
receptacle because its maximum current require-
ments exceed the capacity of a typical
1
5A recepta-
cle. The 20A receptacle is a NEMA 5-20R style.
6
W
G
Summary of Contents for Black Max X300
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