ART Pro-VLA 500

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An affordable favorite of many makes its way into the API 500 form factor!

The VLA-500 brings the same VCA-less Vactrol based compression circuit used in ART's legendary Pro-VLA, putting to a convenient 500 Series format for the first time. Capable not only of delivering incredibly smooth compression and overall dynamic control, the VLA-500 also offers two user selectable tone shaping circuits making it one of the most versatile signal processors in your 500 Series rack.

The 'Punch' circuit is a J-FET Harmonic Enhancer that adds even-order harmonic distortion for a fuller, "punchier" tone while taming nasty peaks that may escape the Vactrol. The Grit circuit adds frequency-dependent signal distortion to make any track truly stand out. This is a highly creative effect that can work especially well on drums and percussion, solo brasses and woodwinds and even vocals when added presence and position in a mix is required. Bypassing both 'Punch' and 'Grit' circuits delivers the purest Opto-compressor tone, perfect for critical solo instruments and clean vocals. 'Punch' and 'Grit' circuits can even be combined for additional tone shaping options.


  • 500 Series Form Factor Compressor Module
  • Based on Popular PRO-VLA Technology
  • VCA-less Vactrol Opto-Compressor Design
  • Two Additional Selectable Solid State Tone Shaping Circuits ('Punch' & 'Grit')
  • Variable Threshold, Ratio and Output Controls
  • Stereo / Multi-Channel Linkable
  • LED Metering


  • Equivalent Input Noise -102dBu ('A' weighted)
  • Input Impedance 10K Ohms
  • Output Impedance 100 Ohms
  • Inputs Level +20dBu
  • Output Level +20dBu
  • Output Gain +20dB max
  • Frequency Response 20Hz to 100KHz (+/- 0.5dB)
  • Dynamic Range >120dB (20-20KHz)
  • Attack Time 0.25msec. to 50msec. variable
  • Release Time 150msec. to 3 sec, variable
  • Total Harmonic Distortion <0.003% (@1kHz, typical)
  • Power Requirements 80mA (75mA @+ 15V, 4mA@48V)
  • Slope Variable: 2:1 to 20:1
  • Max Gain Reduction 30dB
  • Dimensions 5.23" H x 1.49" W x 6.6" D
  • Weight 0.7 lbs (0.32kg)

Our ONE WITH EVERYTHING ZEN WARRANTY extends the standard manufacturer warranty by one year, see our ZEN WARRANTY page for details.

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