Connectors - Crown MA-1202 Operation Manual

4 Operation
4.3 Back Panel Controls, Indicators and Connec-
tors
G. Power Cord
The power cord has an appropriate plug for the required
voltage. 120 VAC, 60 Hz North American Macro-Tech
602s and 1202s have 14 AWG line cords and NEMA 5-
15P plugs. Macro-Tech 2402s have 12 AWG line cords
and NEMA 5-20P plugs. International units are shipped
with an appropriate line cord and plug. See Section 7 for
AC power usage.
H. Stereo/Mono Switch
The three operating modes of a Macro-Tech amplifier are
controlled by this switch. Stereo mode is used for nor-
mal two-channel operation, Bridge-Mono mode is used
to drive a single channel with a load impedance of at
least 4 ohms, and Parallel-Mono mode is used to drive a
single channel with an impedance less than 4 ohms.
Important: Turn off the amplifier before changing the ste-
reo/mono switch (see Sections 3.6.2 and 3.6.3).
I. Reset Switches (Macro-Tech 2402 only)
The Macro-Tech 2402 has a back panel Reset switch for
each channel. Each switch resets the circuit breaker that
protects the channel's power supply from overload.
page 12
J. PIP Module
The standard PIP2-FXQ is included with your amplifier. It
provides female three-pin XLR input connectors. A vari-
ety of other PIP modules can be used in place of the
PIP2-FXQ. They add additional features that customize
the amplifier for different applications (see Section 5.3.1
for information on available PIP modules).
Input Sensitivity Switch (not shown)
The three-position input sensitivity switch located inside
the amplifier can be set after removing the PIP module
(J). It is set at the factory to 0.775 volts for standard 1-
kHz output into 8 ohms. It can also be set to 1.4 volts for
standard 1-kHz output into 8 ohms, or a fixed voltage
gain of 26 dB (see Section 3.7).
K. Balanced Phone Jack Inputs
Balanced 1/4-inch phone jack input connectors are pro-
vided on the PIP2-FXQ. The phone jacks can be wired for
either balanced (tip, ring and sleeve) or unbalanced (tip
and sleeve) input signals. Caution: The Channel 2 input
should NOT be used in either Bridge-Mono or Parallel-
Mono mode.
Figure 4.2 Rear Panel Controls & Connectors
(Note: Reset Switches (Item I) only available on the Macro-Tech 2402 model.)
MA Series Power Amplifiers
L. Balanced XLR Inputs
The factory-installed PIP2-FXQ provides a three-pin
female XLR connector for balanced input to each chan-
nel. The XLR inputs are connected in parallel with the
amplifier's phone jack inputs. Because the PIP2-FXQ
does not have any active circuitry, its XLR connectors
can also be used as "daisy chain" outputs to connect sig-
nals from phone jack inputs to multiple amplifiers. Cau-
tion: The Channel 2 input should NOT be used in either
Bridge-Mono or Parallel-Mono mode.
M. Output Jacks
A pair of versatile 5-way binding posts is provided for
the output of each channel. The 5-way binding posts
accept banana plugs, spade lugs or bare wire. (European
models do not accept banana plugs.)
N. Input Ground Lift Switch
The input ground lift switch is located on the PIP2-FXQ.
It is used to isolate the input signal grounds from the AC
(chassis) ground to help prevent ground loops that can
result in unwanted hum and noise (see the Crown Ampli-
fier Application Guide for more information about pre-
venting ground loops).
Operation Manual