MPAC-01 User Manual
Contents
1. F Phase Switch In 0 Out 180 The Phase switch allows you to invert the polarity of the microphone input signal 180 G Pad Switch Use this switch to attenuate or reduce the microphone s input signal by 20dB H Output Level Gain Reduction Switch The meter on the front of the Preamp Compressor can display either the output level or the amount of gain reduction when the compressor is engaged l dBu Meter This meter shows the output level from 5 to 22dBu and the amount of gain reduction from 0 24dBu J Threshold Control Knob The threshold control sets the point at which the compressor circuit will act on the input signal When the input goes above the threshold the signal will be reduced Turning this control counterclockwise lowers the threshold Turning this control clockwise raises the threshold K Attack Control Knob This knob controls the length of time it takes for the compres sor to reduce the volume to the level set by the compression ratio Turning the knob counterclockwise will make the compressor react faster and turning the knob clockwise will slow down the reaction time L Ratio Control Knob Determines the input output ratio for signals above the threshold M Release Control Knob Determines how long it takes for the sound to return to the normal output level after the input signal has returned below the threshold N Make up Control Knob This knob sets the output volume of the compressed signal2. with one microphone Before you get started please take a moment to read through this manual so you can make the most out of your new purchase What Does A Mic Preamp Do A preamp is a critical component in the signal chain of any recording system In a typical recording set up your preamp compressor will connect to a mixer an A D converter computer audio interface or a recording device Microphones output a low level signal that is not strong enough to record without some kind of amplification This is where your preamp comes in by adding gain or volume to the low level signal called a mic level signal Once the preamplifier or pre boosts the mic level signal it can be sent to your recording device 2 User Manual What Does A Compressor Do Also an important tool in audio engineering a compressor is an audio circuit that auto matically adjusts or compresses the audio signal level for a more consistent dynamic range A compressor accomplishes this by decreasing the volume when the source is louder than a set threshold INSTALLATION The package includes the MXL MPAC 01 preamp compressor power supply and this manual Carefully examine the packaging for any signs of physical damage which may have occurred in transit If the unit is damaged contact the retailer where you purchased the unit The MXL MPAC 01 is a standard 1RU rack mount sized unit that can be rack mounted or placed on a desk or other workin
3. MXE MPAC 01 SAFETY GUIDELINES CAUTION To reduce the risk of electrical shock do not remove the cover Do not expose this appliance to rain or moisture There are no user serviceable parts inside Please refer servicing to qualified personnel only Keep These Instructions Please retain all safety and operating instructions for future reference Heat This product should be situated away from other heat sources such as fire high heat emitting devices heaters etc Grounding and Polarization Never defeat the product s power grounding means Power Cord Protection Power supply cords should not be connected or placed in a fashion that could allow possible exposure to damage Take care to avoid wear and tear rubbing squashing etc Cleaning The product should be cleaned only with a soft cloth Do not use any harsh chemicals or corrosive products on the unit Inactivity The power cord of the product should be unplugged from the outlet when left unused for a long period of time Service requirement Service should be performed only by qualified service personnel The user should not attempt to service this product INTRODUCTION Congratulations on your purchase of the MXL MPAC 01 This state of the art microphone preamp compressor is designed for today s recording equipment and will enhance your recordings by adding rich tonal quality and precise signal control The MXL MPAC 01 is a single channel preamp meaning it operates
4. Since compressing a signal makes it quieter use the Make up Control Knob to restore the signal to its original volume O Knee Hard Soft This switch will control whether the bend in the response curve is a sharp angle or has a rounded edge P Compressor On Off Bypasses the compressor 4 User Manual BACK PANEL A B C MIC INPUT INSERT MIC OUTPUT 24V 171000mA A Mic Input Balanced 3 pin XLR cable sold separately plugs directly to your microphone B Insert This 1 jack is intended for auxiliary devices like reverb delay voice boxes etc The insert jack comes before the compressor circuit so you can send a dry signal for processing or input a line level signal to the preamp for compression T Send R Return S Ground C Mic Output Balanced 3 pin XLR cable sold separately Plug the output signal Balanced line level into your recording device Note The microphone cable can have a profound effect on the sound quality Even the finest microphones will sound poor if the interconnect cable allows noise to enter or causes distortion and loss of information Use only the best microphone cable your budget will allow We recommend Mogami cable for the best results General Use The MXL MPAC 01 is a microphone preamplifier and compressor for use when recording or mixing vocals and instruments To use the MXL MPAC 01 as a mic preamplifier only simply switch the Compressor On Off swit
5. ch Typical Audio Recording Set Up Using a Pre Amp Compressor MXL PREAMP MXE MPAC 01 User Manual Whether you re a season audio professional or just starting out remember that recording and mixing is a creative process and it will take time and a lot of experimentation before you find the sweet spot There are many good audio recording resources both online and in print to help you learn Enjoy your MXL MPAC 01 MXL MPAC 01 SPECIFICATIONS Input Output Balanced XLR Input impedance 15K ohms Max output 20dB HPF Switch Variable from 50Hz 175Hz Frequency Response 20Hz 20kHz Phantom Power 48Volts Max gain 60dB Adjustable Threshold 20dB to 20dB Adjustable Makeup Gain 10dB to 10dB Knee Hard Soft Adjustable Ratio 4 1 2 1 3 1 4 1 5 1 9 1 00 1 Phase 0 180 Pad OdB 20dB Illuminated VU Meter Insert Jack Warran Output Gain Reduction T Send R Return S Ground EFFECTS PROCESSOR Marshall products are guaranteed against defects in material and workmanship for three years from date of purchase Should you encounter any problem with this unit promptly contact the company you pur chased it from for assistance The original dated sales receipt will be necessary for any warranty claim Do not send any unit directly to us without prior authorization from our service department Warranty coverage is limited to repair or replacement at our option of th
6. e MPAC 01 and does not cover incidental damages due to use of this unit nor damage caused by accidental misuse of this product 7
7. g surface MAIN POWER The MXL MPAC 01 comes with an external power supply Connect the power supply to the main power input located on the rear of the unit Only use the power supply included with the product If you lose or damage the power supply contact MXL to inquire about replac ing the power supply FRONT PANEL A C D F H O Gon MAXI Y EE 6 OS OAR EIS OOO GT ANN a a E G I J K LMN P A On Off Switch When the power is turned on the power indicator LED will illuminate B B On Off 48V The MXL MPAC 01 supplies 48V DC phantom power for condenser and active dynamic ribbon mics Consult your microphone s user manual to see if phantom power is needed to power it It s best to have phantom power turned off when connecting microphones to the MXL MPAC 01 Be sure to turn down or mute the output when engaging or disengaging phantom power C Gain Control Knob Use the Gain control knob to set volume The gain range is infinity to 60dB Full counterclockwise is the minimum gain position full clockwise is maximum gain MXE MPAC 01 D HPF Knob A High Pass Filter is designed to let high frequencies pass while attenuating lower frequencies Use this control knob to minimize unwanted low frequency sounds The cut off frequency is variable from 50Hz to 175Hz with a set slope of 12dB octave E High Pass Filter On Off Engage or disengage the high pass filter
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