cumstances 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 includ-
ing:
- 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
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 instru-
ment 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 require-
ments. 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 ship-
ping 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 ship-
ping carton
- The ownerÕs manual
- User Registration Card
AC Power Hookup
The PRO MPA has an internal power supply designed to oper-
ate 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 cir-
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