User manual PRESONUS M80

[. . . ] 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. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you. [. . . ] whether one or all eight channels are utilized. distortion associated with insufficient power. Phantom power switch is engaged, power is supplied at a constant rate performance of your condenser microphone(s) and that it will be free of This assures optimum · A phase reverse switch is provided on each channel. This switch enables the user to invert the phase of a microphone when phase cancellation is noted. The 4 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 reduced chance of over-driving the input and thereby avoiding distortion. · · The M80 has +28 dBu of headroom on each channel. This feature gives you a very wide dynamic range and excellent transient response characteristics. A Rumble filter is located on each channel to eliminate 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 M80 has a Mic/Instrument connector using the Neutrik ® Combo connector. This revolutionary new style connector lets you use either 1/4" phone or XLR connectors in the same female input. · The M80 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's even harmonic series is boosted giving the signal "warmth" very much like a vacuum tube or 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 pick-up RF or to age and become "microphonic") · The M80 has a stereo mix bus for combining the input signals assigned to the bus using the L/R function switch on the front panel of the M80. A pan knob allows the placement of the selected signal anywhere in the stereo array of the stereo mix bus out-going signal (i. e. - left; left-center; center; right-center or right). · Inserting stereo headphones into the jack on the front panel of the M80 enables the user to monitor the signals assigned to the Mix bus. Ample power has been provided to allow the operator to hear the processed signals in loud ambient noise 5 CONTROLS & CONNECTIONS environments such as concert halls or clubs or in control rooms monitoring at high volume levels. 6 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 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. Pan control provides constant power panning to the stereo summing bus. IDSS Control being inputted. selects the amount of boost or cut applied to the even harmonic series of the signal The effect of manipulating the harmonic distortion is of increasing or decreasing the apparent "warmth" of the signal. This capability is due to a new transformer that PreSonus is proud to debut in the M80. Experiment with IDSS and see what type of sounds you can get from your present microphone selection. 8 CONTROLS & CONNECTIONS Phantom Power is available to each channel input of the M80. without any degradation of audio quality. 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 PIN 1 PIN 2 PIN 3 GND +48v +48v XLR Phase Reverse Switch connector wiring for Phantom Power 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. [. . . ] Then connect the M80's return jack to the output of the external processor. The signal is now routed out of the M80, into the external processor, then back into the M80. The final, processed signal will be available at the M80 channel output XLR connector or the Mix Bus output if assigned to the mix bus. 3. 5 Using Return as Line In The return jacks on each channel can be used to insert external audio devices such as tape machine outputs, DAT machine outputs, etc. This then makes the audio device available to the mix bus for mixing in with microphones or instruments. 13 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. [. . . ]