Crown Audio MA-24X6, MA-36X12 Options PIP Modules, IQ-PIP-USP2 Adapter, Input Ground Lift Switch

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

4 Advanced Features

and Options

4.3 Options

4.3.1 PIP Modules

Versatile PIP (Programmable Input Processor) modules provide flexible expansion features that can be added to customize the amplifier. PIP modules plug into the connector inside the back panel of the amplifier.

PIP modules are available with a features rang- ing from error-driven compressor/limiters to IQ control. Visit the Crown website at www.crownaudio.com, or contact Crown Tech- nical Support, for descriptions of available PIP modules.

4.3.2 IQ-PIP-USP2 Adapter

The IQ-PIP-USP2 Adapter allows the amplifier to accept the Crown IQ-PIP-USP2 module, which offers remote control and monitoring via Crown’s Smart Amp™ IQ features set, plus a wide range of digital signal processing capabil- ities

Features:

• 24-bit, 48-kHz sampling rate for analog to digital conversion.

• Programmable DSP filters.

• Greater than one-half second of signal delay for each channel.

• Input Signal Compressor/Limiter, Ther- mal Limiter and Clip Eliminator for each channel.

• Presets for easy recall of settings.

• Auto-Standby for reduced energy costs.

• Error reporting.

• Logic input and output.

• Listen Bus allow easy connection to an audio monitoring system.

4.3.3 Input Sensitivity Switch

The Input Sensitivity Switch is located inside the PIP compartment at the back of the ampli- fier (Figure 4.1). It is set at the factory to 0.775 volt for rated output into 8 ohms. It can also be switched to a sensitivity of 1.4 volts, or a fixed voltage gain of 26 dB (4.8 volts for rated out- put). At 26 dB voltage gain, the equivalent input sensitivity is:

Macro-Tech 24X6: 3.1V for Channel 1, and 2.2V for Channel 2.

Macro-Tech 36X12: 4.8V for Channel 1, and 2.6V for Channel 2.

How to change the input sensitivity:

1.Turn off the amplifier and disconnect its power cord from the AC mains power recep- tacle.

2.Remove the PIP module (two screws).

3.Locate the sensitivity switch access hole inside the chassis opening as shown in Fig- ure 4.1. It is located just above the phone jack inputs.

4.Set the switch to the desired position noted on the access hole label. The position toward the front panel sets the sensitivity to 1.4

volts for rated output, the middle position provides a voltage gain of 26 dB, and the position toward the back panel sets the sen- sitivity to 0.775 volt for rated output.

5.Replace the PIP module and restore the power.

4.3.4 Input Ground Lift Switch

The Input Ground Lift switch is located on the rear panel (Figure 4.1) and can provide isola- tion between the input signal ground and the AC ground. It affects only the phone jack inputs and has no effect on the input connectors on the PIP module. Sliding the switch to the left isolates or “lifts” the grounds by placing an impedance between the sleeve of each phone jack and the circuit ground.

When a PIP module is plugged into the ampli- fier, only the noninverted and inverted signal lines are connected in parallel with the corre- sponding lines of the input phone jacks. The signal grounds are not paralleled. For example, XLR pins 2 and 3 are connected in parallel with the tip and ring of the corresponding phone jack. However pin 1 of the XLR is not con- nected in parallel with the sleeve of the phone jack.

Figure 4.1 Input Sensitivity and Ground Lift Switches

page 16 Operation Manual