Crown Audio MA-36X12 G. Power Cord, H. Reset Switches, I. PIP Module, Input Sensitivity Switch

Macro-Tech MA-24X6 & 36X12 Power Amplifiers

3 Operation

3.3Back 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.

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.

Figure 3.2 Back Panel

Controls and Connectors

Operation Manual page 13