ART Pro VLA II Two Channel Vactrol-Based Compressor

Full Description

Vactrol-based optical compression for smooth dynamics

At the core of the Pro VLA II is its Vactrol-based optical compression circuit, which reacts smoothly to input signals for high musical gain reduction. Unlike aggressive solid-state compressors, this optical design allows for gentle, natural compression that preserves the character and dynamics of the original sound.

By pairing this Vactrol technology with high-quality 12AT7 tubes, the Pro VLA II delivers warmth and transparency, making it an excellent choice for vocal levelling, mix bus compression, and instrument processing. The result is a rich, polished sound that enhances recordings without introducing unwanted artefacts.

Comprehensive control for precise compression

The Pro VLA II provides full control over the compression process with dedicated knobs for threshold, ratio, attack, release, and output gain on each channel. The threshold control sets the level at which compression engages, while the variable-ratio allows for subtle levelling or more aggressive limiting.

Attack and release controls enable users to fine-tune how quickly the compressor responds to transients, making it suitable for a variety of sources, from fast drum hits to smooth vocal performances. The LED gain reduction meter offers real-time feedback on the amount of compression applied, ensuring easy visual monitoring of dynamic adjustments.

Stereo linking for mix bus and mastering applications

For processing stereo signals, the Pro VLA II features a stereo link function that ensures both channels operate in sync. This prevents phase inconsistencies and maintains a stable stereo image, making it an excellent choice for mix bus compression, drum overheads, or mastering applications.

In linked mode, the Channel 1 output level control functions as the master volume, while Channel 2’s output control adjusts the balance. This setup allows users to apply compression to stereo sources with ease, ensuring even and consistent gain reduction across both channels.

Professional connectivity and metering

Designed for professional studio environments, the Pro VLA II includes XLR and 1/4-inch TRS balanced inputs and outputs, allowing integration into any studio or live sound setup. These high-quality connections ensure clean, low-noise signal transfer, whether the unit is used in a mixing console’s insert path, between a preamp and an interface, or in a mastering chain.

For precise monitoring, the Pro VLA II features large VU meters that can display input or output levels, while LED bar meters provide peak-level monitoring. These metering options make it easy to fine-tune settings for optimal signal levels. With a durable steel chassis, an internal power supply, and rackmountable construction, the Pro VLA II is built for reliability and long-term use in any professional audio environment.

Features

• Opto-tube compression with 12AT7 vacuum tubes for warm, natural dynamics
• Smooth optical gain reduction preserves transients without harsh artefacts
• Variable threshold, ratio, attack, and release controls for precise shaping
• Stereo link mode ensures even compression for mix bus and mastering
• XLR and 1/4-inch TRS balanced inputs and outputs for professional connectivity
• Large VU meters for accurate input and output level monitoring
• LED gain reduction indicators provide real-time visual feedback
• Handles everything from subtle levelling to aggressive limiting
• Rugged, rack-mountable steel chassis for durability
• Internal power supply for consistent and reliable performance

Specifications

• Dynamic Range: > 100dB (20-20KHz)
• Total Harmonic Distortion: <0.1 (typical)
• Equivalent Input Noise: @+4dBu: -99dBu (''A'' weighted) / @-10 dBV: -107dBu (''A'' weighted)
• Frequency Response: 10Hz to 100KHz (+/- 0.5dB)
• Input Impedance: 10K Ohms
• Maximum Attenuation: 30dB
• Maximum Input Level: +20dBu (in +4dBu mode) / +10dBV (in -10dBV mode)
• Maximum Output Level : +20dB max
• Attack Time: 0.25msec. to 50msec. variable
• Release Time: Variable 150ms to 3s
• Slope: Variable 2:1 to 20:1
• Dimensions: 3.5" x 19" x 9.2" (8.9cm x 48.3cm x 23.3cm)
• Weight: 10.5lbs (4.76kg)
• Product Code: ART-PROVLAIICE