Levelar Professional Vactrol Leveling Amplifier USER’S GUIDE
Introduction Overview: Thank you for purchasing the Levelar—and congratulations: You now own one of the most sophisticated pieces of audio signal processing gear. Similar in design philosophy to the classic tube limiters, the Levelar utilizes a VCA-less design for premium, musical performance. This design features electro-optical (Vactrol) and vacuum tube electronics which deliver classic sound without the “old” noise. Compression is used to alter the dynamic range of a signal.
stronger signal and will keep noise to a minimum. Microphones must be run into a microphone preamplifier (like A R T’s Tube MP) before being run into the Levelar. Use the XLR input for use with equipment that provides an XLR output (like the Tube MP). Use the 1/4” input jack for balanced or unbalanced 1/4” applications. XLR pin configuration: pin 1 = ground, pin 2 = Positive (hot), pin 3 = negative (cold). The 1/4” TRS configuration is: Tip = Positive (hot), Ring = Negative (cold), Sleeve = Ground.
mix material, etc.). A R T Levelar SPECIFICATIONS Output Control The Output control sets the output gain of the Levelar. When the control is fully counterclockwise, the output level of the Levelar is attenuated by -83dB. Turning the control clockwise adds gain (sometimes called “make-up” gain). Since levels can be decreased when compression is applied, the Levelar has the ability to apply gain to bring the processed signal back up to unity (same as input level).
WARRANTY & SERVICE INFORMATION Service LIMITED WARRANTY Warranty service for this unit will be provided by Applied Research & Technology, Inc. in accordance with the following warrant statement. 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. Applied Research & Technology, Inc.
