Instruction/ maintenance manual of the product Pro VLA II Art
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Pro VLA II™ PROFESSIONAL TWO CHANNEL VACTROL ® /TUBE LEVELING AMPLIFIER USER’S GUIDE.
IMPORTANT SAFETY INSTRUCTIONS – READ FIRST This symbol, wherever it appears, This symbol, wherever it appears, alerts alerts you to the presence of uninsulated you to important operating and maintenance dangerous voltage inside the enclosure. Voltage in structions in the accompanying literature.
Pro VLA II PROFESSIONAL TWO CHANNEL VACTROL ® /TUBE LEVELING AMPLIFIER IMPORTANT SAF ETY INSTRU CTIONS – RE AD FI RST .......................................................................... 1 INTRODUC TION ...................................
INTRODUCTION Thank you for purchasing Applied Research and Technology ’s Pro VLA II . Offering a superb level of sound quality, the Pro VLA II has a unique design that will enhance the sonic textures of your audio system for years to come. The Pro VLA II is one of the finest audio compressors available.
Unpacking Your Pro VLA II 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 VLA II when it is not installed in a rack, or in the unlikely event that you need to retu rn your Pro VLA II for servicing.
FRONT PANEL CONTROLS and INDICATORS Power The POWER switch turns the power on and off to the unit. The Pro VLA II should be turned “on” with all monitor levels turned down to protect against any “thumping” caused by power up. Likewise, the Pro VLA II should be turned “off” after turning all monitor levels down.
FIGURE 1 – Channel 1 Controls Output Level Control The OUTPUT LEVEL control serves two functions. The CH1 knob always controls the output level of CH1, but can also serve as a “MASTER” output level when the Link Mode is active. The fully counter-clockwise position of the knob mutes the output.
Release Control The RELEASE control sets the time the Compressor/Limiter takes to increase the gain after the input level drops. Longer settings maintain the dynamics of the input si gnal, while shorter settings reduce the dynamics.
FIGURE 2 – LED Output Meter and Link Switch LED Output Meter This meter displays both average and peak levels of the output signal. The LED labels indicate how far the output is away from full maximum output in dB. In each bargraph, a single LED is held on for a little over one second, displaying the peak level.
REAR PANEL I/O The Pro VLA II™ XLR connectors follow the AES standard of: Pin 1 = Ground, Pin 2 = Hot (+), Pin 3 = Cold (-). The balanced 1/4” phone jacks are typical TRS connection s: Tip - Hot (+), Ring - Cold (-), Sleeve - Ground. Balanced Inputs The Pro VLA II™ provides both an XLR and 1/4” input jack.
FIGURE 3 – Rear Panel Balanced Outputs The analog output of the Pro VLA II™ is available on both a 1/4” TRS balanced ja ck and an XLR jack. This output is active pseudo balanced. The output has a 100 Ohm impedance into a balanced or unbalanced loa d.
APPLIC ATIONS Compressor/ Limiter The main application of the Pro VLA II™ is to control the dynamic range of an au dio signal. Plug a line level (post preamplifier or other gain stage) source into either input, and set the threshold and output controls to provide the desired amount of compression to the input signal.
WARRANTY INFORMATION Limited Warranty: Applied Research and Technology will provide warrant y and service for this unit in accordance with the following warrants: Applied Research and Technology, (ART.
SERVICE The following information is provided in the unlik ely event that your unit requires service. 1) Be sure that the unit is t he cause of the problem. Check to make sure the unit has power, all cables are connected correctly, and t he cables themselves are in work ing condition.
SPECIFICATIONS Input Impedance Balanced/Unbalanc ed ................................................................ 10K Ohms Maximum Levels Range Swit ch ............................................................................. +4dB u/-10dBV selectable Inputs .
www.artproaudio.com E-mail: support@artproaudio.com © 2007 Applied Research & Technology 213-5004-100 e 15.
An important point after buying a device Art Pro VLA II (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Art Pro VLA II yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Art Pro VLA II - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Art Pro VLA II you will learn all the available features of the product, as well as information on its operation. The information that you get Art Pro VLA II will certainly help you make a decision on the purchase.
If you already are a holder of Art Pro VLA II, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Art Pro VLA II.
However, one of the most important roles played by the user manual is to help in solving problems with Art Pro VLA II. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Art Pro VLA II along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
