Crown Audio Macro-Tech Series (24x6 & 36x12) - Manual (Page 13)

page 13
Macro-Tech MA-24X6 & 36X12 Power Amplifiers
Operation Manual
3.3 Back Panel Controls
and Connectors
G. Power Cord
120 VAC, 60 Hz units have a 20-amp (12 AWG)
line cord with a grounded NEMA 5-15P plug.
See Section 8 for AC power usage.
H. Reset Switches
The reset switches are used to reset the break-
ers that safeguard each power supply from
overload.
I. PIP Module
The standard P.I.P.-FX is included with your
amplifier. It provides female XLR input connec-
tors. A variety of other PIP modules can be
used in place of the P.I.P.-FX. They add addi-
tional features that customize the amplifier for
different applications. For information on avail-
able PIP modules visit the Crown website at
http://www.crownaudio.com.
Input Sensitivity Switch
The three-position input sensitivity switch
located inside the amplifier is accessed by
removing the PIP module (I). It is factory-set to
0.775 volts for rated 8 ohm output. It can also
be set to 1.4 volts for rated output, or a voltage
gain of 26 dB (see Section 4.3.3).
J. Balanced Phone Jack Inputs
Balanced ¼-inch phone jack input connectors
are provided on the back panel of your ampli-
fier. The phone jacks can be wired for either
balanced (tip, ring and sleeve) or unbalanced
(tip and sleeve) input signals. Because they are
electrically in parallel with the PIP input con-
nectors, input signals should not be connected
to the phone jacks when certain PIP modules
are installed (see the Crown Amplifier Applica-
tion Guide availabel online at www.crownau-
dio.com). The phone jacks can also be used as
“daisy chain” outputs to simplify connecting
input signals to multiple amplifiers.
K. Ground Lift Switch
This switch isolates or “lifts” the phone jack
signal grounds from the AC power ground.
Activating the switch inserts an impedance
between the sleeve of each phone jack and the
unit’s AC ground to help prevent the hum that
can result from a ground loop.
3 Operation
Figure 3.2 Back Panel
Controls and Connectors
L. Balanced XLR Inputs
The factory-installed P.I.P.-FX provides a three-
pin female XLR connector for balanced input to
each channel. The XLR inputs are connected in
parallel with the amplifier’s phone jack inputs.
Because the P.I.P.-FX does not have any active
circuitry, its XLR connectors can also be used
as “daisy chain” outputs to connect signals
from phone jack inputs to multiple amplifiers .
M. Output Jacks
A pair of versatile 5-way binding posts is pro-
vided for the output of each channel. The 5-way
binding posts accept banana plugs, spade lugs
or bare wire. Note: Because of its higher output
power, the Macro-Tech 36x12 has an additional
set of binding posts.