PRO MPA Professional Two Channel Tube Microphone Preamplifier USER’S GUIDE
TABLE OF CONTENTS Introduction Registration Features Overview Setting Up Unpacking AC Power Hookup Audio Connections Installation Safety Precautions Powering Up Front Panel Controls and Indicators Power Input Level Control Output Level Control +20dB Gain/Norm Switch Phase Switch Phantom Power Switch HPF Control 10 Segment Tube Character Array VU Meter Rear Panel Connections Input Output Applications Warranty Information Service Information PRO MPA Specifications On-line Information 210-5004-101 1 2 2 3 4
Introduction Thank you for purchasing Applied Research and TechnologyÕs PRO MPA. Offering a superb level of sound quality, the PRO MPA has a unique design which will enhance the sonic textures of your audio system for years to come. Registration If you havenÕt done so already, please take the time to fill out the User Registration Card for your purchase. Having you in our data base allows us to keep you informed of updates, application notes, and new product introductions.
OVERVIEW The PRO MPA (Microphone Pre Amplifier) is a multi-purpose tool for audio engineering and recording. Enclosed in a 2U (3.5Ó high) rack-mountable chassis are two independent channels of analog microphone preamplifiers designed to work seamlessly with any recording, sound-reinforcement, or electronic instrument setup. A R TÕs PRO MPA circuitry is a hybrid design utilizing the latest and most advanced solid state and tube technology.
can cause the PRO MPA to produce a ÒthumpÓ on power up and power down. PRO MPA with the +20dB gain switch in is needed. Use the setting that best fits your application. If the PRO MPA fails to power up when the power switch is turned on, check to see that its power cord is plugged into an active outlet. If the unit still fails to operate properly, turn it off and unplug it. Then consult your dealer or A R TÕs Customer Service department.
power is present. However, if the mic doesnÕt need it, donÕt use it. Some things are best left untested! HPF (High Pass Filter) Control The HPF is a low frequency roll-off intended for use to Òtune outÓ unwanted rumbling or breath noises. A High Pass Filter allows frequencies above its set point to pass unaffected while gently rolling off frequencies below its set point. The range of the PRO MPAÕs HPF is 7Hz to 150Hz with a slope of 6dB per octave.
APPLICATIONS WARRANTY AND SERVICE INFORMATION Microphone Preamp The main application of the PRO MPA is a microphone preamplifier. Plug any microphone directly into either input and set the input and output controls to provide an appropriate level into the next stage of your system. Limited Warranty Warranty service for this unit will be provided by Applied Research and Technology, Inc. in accordance with the following warranty statement. DI (Direct Input) The PRO MPA is ideal for use as a DI box.
1) Be sure the unit is the cause of the problem. Check to make sure the unit has power supplied, all cables are connected correctly, and the cables themselves are in working condition. 2) If you find the unit to be at fault, write down a description of the problem, including how and when the problem occurs. 3) Call the factory for a Return Authorization (RA) number. 4) Pack the unit in its original carton or reasonable substitute. The packing box is not recommended for a shipping carton.