User manual ART PRO MPA

[. . . ] 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 2 2 3 4 4 4 4 5 5 5 5 6 6 6 6 6 7 7 8 8 9 9 9 9 10 11 12 13 13 1 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. [. . . ] The PRO MPA should be powered ÒonÓ with all monitor levels turned down, or off, to protect against any ÒthumpingÓ caused by high gain settings. Likewise, the PRO MPA should be turned ÒoffÓ after turning all monitor levels down. Input Level Control The Input Level Control sets the amount of input gain of the PRO MPA. Turn the control clockwise to increase gain and counterclockwise to decrease gain. You may control two ranges of gain with this control, +26 to +60dB and +6 to +40dB. Selection of the gain range is made with the +20dB gain switch. When setting the Input Level Control, refer to the 10 segment Tube Character Array for a visual reference to the PRO MPAÕs internal signal levels (applied gain). Output Level Control The Output Level Control sets the output level of the PRO MPA. When the control is fully counterclockwise, there is no output Level. Turning the control clockwise increases the level of the output to a maximum of +10dB of gain. This gain is in addition to the existing input gain. When setting the Output Level Control, refer to the Vu Meter for an accurate level leaving the PRO MPA. +20dB Gain/ Norm Switch Use the +20dB Gain/ Norm switch to set the gain range of the Input control. When the switch is in the out (Normal) position the gain range is +6 to +40dB. Depressing the switch adds 20dB of gain. With the switch in, the gain range is +26 to +60dB. With most microphone applications youÕll find using the 6 7 power is present. However, if the mic doesnÕt need it, donÕt use it. 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. This gentle slope allows unwanted low frequency information to be rolled off while not affecting the tonality of the input signal. [. . . ] products. SERVICE The following information is provided in the unlikely event that your unit requires service. Use this procedure to return units in the United States only. For service outside the United States, please contact your authorized A R T distributor. 10 11 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. [. . . ]