Rear Panel Controls & Connectors - Crown Macro-Tech MA-1200 Reference Manual

Macro-Tech 600/1200/2400 Power Amplifiers
(Note: Reset Switches (Item I) only available on the Macro-Tech 2400 model . )
are controlled by this switch. Stereo mode is used for
normal 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 stereo/mono switch (see Section 3.3).
I. Reset Switches (Macro-Tech 2400 only)
The Macro-Tech 2400 has a back panel Reset switch
for each channel. Each switch resets the circuit breaker
that protects the channel's power supply from overload.
J. PIP Module
The standard P.I.P.- FX is included with your amplifier. It
provides female three-pin XLR input connectors. A va-
riety of other PIP modules can be used in place of the
P.I.P.-FX. They add additional features that customize
the amplifier for different applications (see Section 8.1
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 4.4).
K. Balanced Phone Jack Inputs
Balanced ¼-inch phone jack input connectors are pro-
vided on the back panel of your amplifier. The phone
jacks can be wired for either balanced (tip, ring and
Reference Manual
Fig. 2.2 Rear Panel Controls & Connectors
sleeve) or unbalanced (tip and sleeve) input signals.
Because they are electrically in parallel with the PIP in-
put connectors, input signals should not be connected
to the phone jacks when certain PIP modules are in-
stalled (see Section 3.3.4). The phone jacks can also
be used as "daisy chain" outputs to simplify connect-
ing input signals to multiple amplifiers. Caution: The
Channel 2 input should NOT be used in either
Bridge Mono or Parallel Mono mode.
L. 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 pre-
vent the hum that can result from a ground loop.
M. Balanced XLR Inputs
The factory-installed P.I.P
male 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 P.I.P
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
(see Section 3.3.4). Caution: The Channel 2 input
should NOT be used in either Bridge Mono or Paral-
lel Mono mode.
N. 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.
. - FX provides a three-pin fe-
. - FX
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