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Reference Manual
Macro-Tech
®
24x6 & 36x12 Power Amplifiers
Fig. 2.2 Rear Facilities
H. Reset Switches
The reset switches are used to reset the breakers 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 connectors. A variety 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
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 volt-
age gain of 26 dB (see Section 4.4).
J. 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
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 3.3.1). 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 pre-
vent the hum that can result from a ground loop.
L. Balanced XLR Inputs
The factory-installed P.I.P.-FX provides a three-pin fe-
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.-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
(see Section 3.3.1).
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.
Note:
Because of its higher output power, the Macro-Tech
36x12 has an additional set of binding posts.
