User manual PRESONUS MP20

[. . . ] PreSonus reserves the right to update any unit returned for repair. PreSonus reserves the right to change or improve the design of the product at any time without prior notice. This warranty does not cover claims for damage due to abuse, neglect, alteration or attempted repair by unauthorized personnel, and is limited to failures arising during normal use that are due to defects in material or workmanship in the product. Any implied warranties, including implied warranties of merchantability and fitness for a particular purpose, are limited in duration to the length of this limited warranty. [. . . ] 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 MP20 has +28 dBu of ? ? ? ? 5 OVERVIEW headroom on each channel. This feature gives you a very wide dynamic range and excellent transient response characteristics. ? Rumble Filter. A Rumble filter is provided on each channel for eliminating low frequency noise. This lets you greatly reduce background noise such as air conditioners or wind noise with the flick of a switch without effecting the desired frequencies. Each channel of the MP20 has a separate XLR microphone input on the rear of the unit and a female 1/4"instrument input jack located on the front panel. High Quality Transformer with IDSS Control. The MP20 offers a high quality transformer on each channel. These feature an IDSS control (this control adjusts the drain current on the input FET amplifier altering the even harmonic levels of the signal being passed) with an adjustment range of 0% to 100%. As the control is rotated to the 100% position, the signal' even harmonic series is s boosted giving the signal " warmth" very much like a vacuum tube or similar to the sound of analog tape saturation. This remarkable effect gives you the sound of a tube without the headache of uneven performance often encountered with vacuum tube devices ( no tube to pickup RF or to age and become " microphonic" ) Mix Bus. The MP20 has a stereo summing bus for combining the input signals assigned to the bus using the L/R function switch on the front panel of the MP20. A pan knob allows the placement of the selected signal anywhere in the stereo array of the stereo summing bus out-going signal (i. e. - left; left-center; center; right-center or ? ? ? 6 OVERVIEW right). ? High Gain Headphone Jack. Inserting stereo headphones into the jack on the front panel of the MP20 enables the user to monitor the signals assigned to the Stereo bus. Ample power has been provided to allow the operator to hear the processed signals in loud ambient noise environments such as concert halls or clubs or in control rooms monitoring at high volume levels. 7 2 CONTROLS & CONNECT IONS 2. 1 FRONT PANEL BASIC LAYOUT Notice that the front panel is divided into two identical Preamplifier sections Channel One and Channel Two - plus a Master section. Channel One and Channel Two are the two microphone preamplifier channels of the MP20. [. . . ] The signal monitored by the headphones is the same signal provided by the Stereo Summing Bus to the Mix Output XLR' on the rear panel of the MP20. A lighted push button is located on the front panel for turning the MP20 On and Off. 11 CONTROLS & CONNECTIO NS 2. 4 BACK PANEL BASIC LAYOUT 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 MP20 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?Simply connect the send jack, balanced or unbalanced to the input of the external processor. [. . . ]