Applied Research and Technology (ART) Pro VLA Owner's Manual

PRO VLA

PROFESSIONAL TWO CHANNEL VACTROL/TUBE

LEVELING AMPLIFIER

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Introduction 2
Registration 2
Features 3
Overview 4
Setting Up 5

Unpacking 5
AC Power Hookup 5
Audio Connections 5

Installation 5
Safety Precautions 6
Powering Up 6
Front Panel Controls and Indicators 6

Power 6

Threshold Control 7

Ratio Control 7

Output Level Control 8

VU Meter Input/Output Switch 8

Attack Time Switch 8

Release Time Switch 8

Bypass Switch 9

Stereo Link/Dual Mode Switch 9

Gain Reduction Meter 10

VU Level Meter 10
Rear Panel Connections 10

Input 11

Output 11
Applications 11
Tube Replacement 12
Warranty Information 12
Service Information 13
PRO VLA Specifications 14
On-line Information 14

212-5004-101

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FFeeaattuurreess
The PRO VLA is one of the finest audio compressors available.
Developed in partnership with studio and live sound engineers,
the PRO VLA possesses a “sound” that is not available from any
other compressor on the market - at any price! A member of the
A R T Reference Series, the PRO VLA was designed and con­structed with the absolute best components, assuring a lifetime
of quiet, reliable performance. The PRO VLA offers:

- Two channel Opto-isolator (Vactrol)/tube-based Leveling
Amplifier

- Stereo linking of channels

- Hand selected 12AX7 Tubes

- Vactrol - Optical electronic isolators

- Non-VCA design = transparent, classic sound

- VU metering of input and output levels

- XLR balanced inputs and outputs

- 1/4” TRS active balanced inputs and outputs

- Variable threshold ratio

- Auto and Fast attack and release settings

- Variable Threshold rotary controls

- Variable Output level rotary controls

- 10 segment Gain Reduction LED Array

- 10Hz to 20kHz Frequency Response (+/-0.5dB)

- >100dB Dynamic Range

- Extremely low noise (-99dBm ‘A’ weighted)

- Internal power supply

- 5-year parts and labor warranty

- Designed and manufactured in the USA

The PRO VLA is member of A R T’s Reference Series of profes­sional signal processing products.

IInnttrroodduuccttiioonn
Thank you for purchasing Applied Research and Technology’s

PRO VLA. Offering a superb level of sound quality, the PRO VLA
has a unique design which will enhance the sonic textures of
your audio system for years to come.

RReeggiissttrraattiioonn
If you haven’t 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. It only takes a
moment and will ensure you are constantly up to date with
your purchase.

Fill in the following for your future reference:

Date of purchase: ___________________

Purchased From: ____________________

Serial Number: 212-________

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