User manual PRESONUS MP20 (BACK)

[. . . ] This warranty only applies to products sold and used in the United States of America. For warranty information in all other countries please refer to your local distributor. PreSonus Audio Electronics, Inc. All rights reserved. TABLE OF CONT ENTS 1 1. 1 1. 2 Overview Introduction Features 4 4 2 2. 1 2. 2 2. 3 2. 4 2. 5 Controls & Connections Front Panel Basic Layout Preamplifier Section Master Channel Back Panel Basic Layout Power Supply 8 9 11 11 13 3 3. 1 3. 2 3. 3 3. 4 3. 5 3. 6 Operation Dynamic Microphones Phantom Powered Microphones Instrument Input Inserting Compressors, EQ' etc. s, Using Return as Line In Aux Input ­ Cascading Mixes 14 14 14 14 15 15 4 4. 1 Technical Specifications 16 3 1 OVERVIEW 1. 1 INTRODUCTION Thank you for purchasing the PreSonus MP20 (BACK) (BACK) Two Channel Microphone / Instrument Preamplifier with Stereo Bus. [. . . ] Good luck and enjoy your MP20 (BACK) (BACK)! 4 OVERVIEW 1. 2 FEATURES The following is a summary of your MP20 (BACK) (BACK)' features: s ? FET, Class A Discrete Input Buffers. Each channel of your MP20 (BACK) (BACK) contains a Class A discrete input buffer followed by a dual servo gain stage. This allows the MP20 (BACK) (BACK) user to boost desirable signal without increasing unwanted background noise (NO capacitors!) 48 Volt Phantom Power. Each channel of the MP20 (BACK) (BACK) has 48V Phantom power available. When the Phantom power switch is engaged, power is supplied at a constant rate whether one or both channels are utilized. This assures optimum performance of your condenser microphone(s) and that it will be free of distortion associated with insufficient power. This switch enables the user to invert the phase of a microphone when phase cancellation is noted. The 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 reduced chance of over-driving the input and thereby avoiding distortion. The 48 volts is supplied by way of the XLR connector for condenser mics and any 9 CONTROLS & CONNECTIO NS other devices requiring continuous power through the XLR input. This power is supplied at a constant level allowing use of both inputs simultaneously 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' XLR connector be switched to successfully utilize s 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 MP20 (BACK) (BACK) 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 MP20 (BACK) (BACK) 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 for reducing the sound of footsteps or other types of vibrations from being transmitted through the microphone stand into the microphone. Gain. The amplifier has inherent gain of 10 CONTROLS & CONNECTIO NS 12dB thus delivering a total gain possibility of 72dB. [. . . ] The Return / Line In connector of the MP20 (BACK) (BACK) 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' When a device is connected to this jack, the Neutrik?disconnected. TIP RING SLEEVE High Low GND (+) (-) Cable Wiring Diagram for Balanced Send / Return Jacks The Send Jack on the back panel of the MP20 (BACK) (BACK) routes the signal being processed by the channel to outboard devices or to recording media. 12 CONTROLS & CONNECTIO NS MIX OUTPUT. A pair of XLR connectors is provided for the Left and Right Outputs of the stereo summing 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 MP20 (BACK) (BACK) accepts a standard IEC cord like those found on most computers and professional recorders. [. . . ]