The Pro VLA II from ART is a dual-channel compressor/leveler that uses an opto-electrical design to provide smooth and musical dynamic range control.

The unit features a mastering-quality audio signal path and a tube-based gain stage. Variable ratios that range from 2:1 to 20:1 allow the unit to work both as a compressor or a limiter. Metal rotary controls with detents provide for the adjustment of threshold and output level, along with variable and separate attack and release speeds.

The front panel features large analog VU meters for each channel, while ten-segment, multi-colored LED arrays provide information on gain reduction. Back-lit push switches set whether either VU meter reflects input or output levels; select a straight wire bypass; and engage a link function, appropriate for stereo mastering. When the channels are linked, channel one controls act globally and the channel two output knob acts as a balance control.

XLR and 1/4" TRS balanced input and output jacks are provided, along with a level selector to set the unit operating levels and metering to match either +4dBu or -10dBV systems. The unit is housed in a 2U space, rack-mountable steel chassis with a CNC routed, black anodized aluminum face panel. The Pro VLA II uses two hand-selected 12AT7 tubes and is designed for years of reliable operation in the studio and on the road.


Function Compressor/leveler
Number of Channels 2
Inputs 2 x XLR
2 x 1/4" TRS phone (balanced or unbalanced)
Outputs 2 x XLR
2 x 1/4" TRS phone (balanced or unbalanced)
Maximum Input Level +20dBu
Compression Threshold -30 to +20dB
Compression Ratio 2:1 to 20:1
Attack Time 0.25 ms to 50 ms, variable
Release Time 0.15 s to 3 s, variable
Gate Threshold Not applicable
Gate Rate Not applicable
Maximum Output Level +20dBu (10kΩ, 0.1% THD)
Make-up Gain +20dB
Frequency Response 10Hz to 100kHz (+/- 0.5dB)
Dynamic Range >100dB (20Hz to 20kHz)
Noise EIN:
-99dBu, A-weighted (+4dBu mode)
-107dBu, A-weighted (-10dBV mode)
Power Requirements 105~125 VAC, 60 Hz
Dimensions (WxDxH) 19 x 9.2 x 3.5" (483 x 234 x 89 mm)
Weight 10.5 lb (4.8 kg)
Specialties Internal power supply

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