Presonus Audio electronic M80 Controls & Connections, XLR connector wiring for Phantom Power

80 Hz Filter.

CONTROLS & CONNECTIONS

Phantom Power is available to each channel input of the M80. The 48 volts is supplied by way of the XLR connector for condenser mics and any other devices requiring continuous power through the XLR input. This power is supplied at a constant level allowing use of all eight inputs for condenser mics without any degradation of audio quality.

PIN 1	GND
PIN 2	+48v
PIN 3	+48v

XLR connector wiring for Phantom Power

Phase Reverse Switch allows the user to invert the polarity of the XLR connector by switching pins two and three. The inversion of the pins of the XLR connector may be necessary to alter the audio phase of two like microphones to compensate for phase cancellation. It may be required that the wiring of a cable’s XLR connector be switched to successfully utilize Phantom power.

-20 dB Pad provides -20 decibels of attenuation with the push of a button. This is a very useful feature for rapidly reducing the level coming into the M80 and thus preventing the input signal from over- modulating (distorting) the input. This may occur due to high output level from a microphone or line device. Padding the input serves to provide increased “headroom” for the operator.

The M80 has an eighty-hertz filter that is activated by engaging the switch on the front panel. This filter (often referred to as a RUMBLE filter) is useful for eliminating extraneous low-end information from the signal being amplified. Frequencies from eighty hertz and below are cut from the incoming signal. This feature is useful in eliminating low frequency noise such as air-conditioning rumble or reducing the sound of footsteps transmitted through the microphone stand into the microphone.

Gain control provides 60dB of gain. The amplifier has inherent gain of 12dB thus delivering a total gain possibility of 72dB.

2 . 3 M A S T E R C H A N N E L

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