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M80 EIGHT CHANNEL MICROPHONE PRE- AMPLIFIER USERS MANUAL Version 1.0 © All rights reserved. 1998, PreSonus Audio Electronics, Incorporated.
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WARRANTY PreSonus Limited Warranty PreSonus Audio Electronics Inc. warrants this product to be free of defects in material and . This warranty is enforceable only by the original retail purchaser . To be protected by this warranty, the purchaser must complete and return the enclosed warranty card within 14 days of purchase . During the warranty period PreSonus shall, at its sole and absolute option, either repair or replace, free of charge, any product that proves to be defective on inspection
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TABLE OF CONTENTS 1 Overview 1.1 Introduction 6 1.2 Features 6 2 Controls & Connections 2.1 Front Panel Basic Layout 8 2.2 Preamplifier Section 12 2.3 Master Channel 14 2.4 Power Supply 16 3 Basic Setup & Operation 3.1 Quick Start 18 3.2 Basic Connections 19 3.3 Basic Operating Procedures 21 4 Technical 4.1 Specifications 24 3
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1 OVERVIEW 1.1 INTRODUCTION Thank you for purchasing the PreSonus M80 Eight Channel Microphone / Instrument Preamplifier with Mix Bus. This pre-amp was designed using state of the art components to deliver crystal clear audio for an infinite period of time. We believe the M80 to be an exceptional sounding unit and an exceptional value. Feel free to contact us at 1-800-750-0323 anytime for any reason whatsoever. We value your suggestions and your comments. PreSonus Audio Electronics is commit
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OVERVIEW phase reverse switch allows the operator to avoid phase cancellation when identical microphones are used in close proximity to one another. The phase reverse switch also can compensate for different XLR connector hook-ups where pin connections have been inverted. • A 20 dB pad is available on each channel for reducing the in-coming signal level. This pad provides a more manageable signal from high output devices giving the operator greater control over the in-coming signal and a much
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CONTROLS & CONNECTIONS environments such as concert halls or clubs or in control rooms monitoring at high volume levels. 6
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4 TECHNICAL 2.1 FRONT PANEL BASIC LAYOUT Notice that the front panel is divided into eight identical Preamplifier sections plus a Master section. These are the eight microphone preamplifier channels of the M80. Preamp channels contain: • Pan Control 7
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CONTROLS & CONNECTIONS • L/R Assign • IDSS Control • Phantom Power Switch • Phase Reverse Switch • -20db Pad • 80 Hz Filter • Gain Control Master Channel contains: • Stereo Output Control • Headphone Level Control 2.2 PREAMPLIFIER SECTION L/R Assign button assigns the signal coming through the channel to the stereo Left/Right Mix Bus output. control provides constant power panning to the stereo summing bus. IDSS Control selects the amount of boost or cut applied to the even harmonic series of th
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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
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CONTROLS & CONNECTIONS The Stereo Output control adjusts the output level of the Stereo Mix Bus. This potentiometer governs the output level of the Bus. Channels are assigned to the bus via the L/R assign switch on the individual pre-amp channels. Headphone control is located above the 1/4-inch stereo headphone output on the front panel. This potentiometer regulates the volume of the headphones. The signal monitored by the headphones is the same as the Stereo Mix Bus output. 2.4 BACK PANEL BAS
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CONTROLS & CONNECTIONS PIN 1 GND PIN 2 High (+) PIN 3 Low (-) Cable Wiring Diagram for Input and Output XLR The Output XLR Connector is servo balanced and operates at +4dBu. The Return / Line In connector of the M80 is provided for use in conjunction with audio process devices such as compressor/limiters and as a Line In for recording media such as tape machines, hard disc recorders, or DAT’s. When a device is connected to this jack, the Neutrik™ Combo jack is disconnected. TIP High (+) RING Low
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CONTROLS & CONNECTIONS A pair of XLR connectors are provided for the Left And Right Outputs of the stereo Mix Bus. Signals are assigned to these outputs using the L/R Assign switches on the individual channels. 2.7 Power Supply The Power Jack on your M80 Power Supply accepts a standard IEC cord like those found on most computers and professional recorders. You can be assured of clean power and rugged construction that will last a long time! Before powering on your M80 for the first time, be sure
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3 OPERATION 3.1 Dynamic Microphones Dynamic microphones are characterized by lower output levels. Hence, more gain is needed to amplify a dynamic microphone to operating level. Occasionally it is necessary to add the –20dB pad to the microphone to avoid distortion (e.g. when recording percussion). Do not use phantom power when using dynamic microphones. 3.2 Phantom Powered Microphones Phantom powered microphones such as condenser and ribbon microphones require external power to pre- amplify the
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CONTROLS & CONNECTIONS 3.6 Aux Input – Cascading Mixes The Aux Input on the M80 mixes an external audio source in with any other channel assigned to the bus. This provides an opportunity to connect multiple M80’s together thus creating more inputs for the stereo mix bus. Connect the balanced bus outputs of one M80 to the Aux inputs of the next M80. The M80 that is the last in the chain is the master output device. Previous mixes can be controlled similar to sub- groups via the Master Level knob.
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4 TECHNICAL : Eight Noise Floor @ Bus Noise Fl oor @ Main Output Frequency Response +/- 0.5dB 10Hz to 60kHz Crosstalk >82dB @ 10kHz +24dB to +60dB idss) max idss) 10k Ohms 51 Ohms <0.02% Bus Master Output Control Full scale 51 Ohms 10k Ohms +4dBu = 0dB Neutrik combo jack, External, 100VAC to 120VAC, or 200VAC to 240VAC Size 2U Rack Weight 12 lbs. As a commitment to constant improvement, PreSonus, Inc. reserves the right to change any 15 specification stated herein at any time in the future wit
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CONTROLS & CONNECTIONS 16
