Overview. Art PRO MPA, PRO MPA II

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. Using a transformerless design throughout, the PRO MPA maintains exceptional signal integrity and extremely low noise. The Active balanced input utilizes a hybrid, triple-differential transistor design, providing extremely low noise and excellent CMRR. A second stage 12AX7A tube running on a regulated DC voltage provides an additional 40 dB of gain. The design causes the tube to overload before the input or output stage. This allows the user to manipulate the tube gain to meet their sonic requirements. The 1/4Ó input has a high impedance, which prevents the loading of any device connected to it and makes the PRO

MPA perfect for DI or line level applications.

SETTING UP

Unpacking

Your PRO MPA was packed with care at the factory. The shipping carton was designed to protect it during initial shipment.

Please retain this carton for use in transporting the PRO MPA when it is not installed in a rack, or in the unlikely event that you need to return your PRO MPA for servicing.

The shipping carton should contain:

- PRO MPA with the same serial number as shown on the shipping carton

- The ownerÕs manual

- User Registration Card

AC Power Hookup

The PRO MPA has an internal power supply designed to operate at 100 to 125VAC, 50 to 60Hz. Units manufactured for use outside of the United States of America have been modified to comply with the required electrical specifications. Under no circumstances should the power cable be altered. If the cable becomes cut or damaged, discontinue its use and have it replaced before operating the Pro MPA.

Audio Connections

Audio connections to and from the PRO MPA are balanced XLR

(Pin 2 Hot (+), Pin 3 Cold (-), Pin 1 Ground) and unbalanced

1/4Ó (Tip Hot (+), Sleeve Ground). We recommend using only high-quality cables equipped with the appropriate connectors.

Installation

The PRO MPA may be employed in a number of setups including:

- Between a microphone and a mixer, digital multi-track recorder, DAT machine, hard disk recorder, or analog recorder.

- In a mixerÕs channel insert points.

- Between a microphone and signal processors.

- Between electronic musical instruments (synthesizers, guitars, bass, samplers, acoustic instruments with pickups) and down line gear.

Note: the PRO MPA should be securely mounted in a standard

19Ó rack.

SAFETY PRECAUTIONS

Warning: To avoid the risk of shock or fire, do not expose this unit to moisture. Do not remove metal panels from chassis parts. Removing the chassis from its cabinet parts exposes dangerous high voltages. There are no user-serviceable parts inside. Hazardous voltages are present inside the chassis.

Refer all servicing to qualified personnel.

Caution: If your power cord becomes damaged and must be replaced, always replace it with the proper type (3 prong).

POWERING UP

When the power switch is turned on, the VU meters will light.

LEDs will light if its associated switch is in its ÒonÓ position. It is important to remember to turn the PRO MPA on before any monitoring levels or power amps are turned on. The PRO MPA has the ability to add over 60dB of gain to its input signal. This