Presonus M80 Manuel d'utilisateur télécharger pdf (Page 11)

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.

80 Hz Filter. 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 MASTER CHANNEL

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Presonus M80 Manuel d'utilisateur Page 11