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Key Features
The Black Lion Audio B172A is a hybrid compressor designed for engineers who want the best of FET and optical compression in one unit. Combining a Seventeen-style FET circuit with an opto section inspired by the legendary 2A, it offers both punchy peak control and smooth, transparent compression. The AB-BA switch allows you to reorder the circuits instantly or use them independently, giving you full control over your dynamics processing.
Product Ref: 326265
The B172A brings together two of the most respected compression circuits in recording history. On one side, you have a Seventeen-style FET limiter known for its fast attack and aggressive character. On the other, an optical compressor inspired by the classic 2A; delivers smooth and natural compression that enhances vocals, bass, and more.
This combination lets you harness the power of both compression types, either separately or in series. Use the FET to catch transients, then smooth out the signal with the optical circuit—or reverse the order for a different compression response. This flexibility makes the B172A an invaluable tool for mixing and tracking.
The B172A’s AB-BA switch puts complete control over your compression chain at your fingertips. Switch between FET-first or opto-first routing directly from the front panel. Each configuration offers a unique sonic response, allowing you to tailor the compression to the needs of your mix.
If you need independent operation, simply set the switch to the third position to disengage the internal routing. This lets you use each compressor separately, making the B172A effectively two processors in one. Additionally, stereo linking lets you pair two B172A units for consistent compression across stereo sources.
Black Lion Audio has carefully selected high-quality transformers to ensure superior signal integrity. The optical side features a CineMag input transformer, known for its detailed and transparent sound. Meanwhile, both circuits use custom Chicago-wound output transformers, providing warmth and character while maintaining clarity. These premium components contribute to the B172A’s ability to handle everything from subtle levelling to heavy dynamic shaping without unwanted distortion.
The optical side of the B172A features Black Lion Audio’s custom T4B opto element, the T4BLA. Designed to be the best T4B optocell available, it delivers consistent, musical compression with a natural release curve. The development of this component involved extensive fine-tuning to ensure optimal performance, making it a standout feature of the B172A.
This careful design approach means the optical compression behaves predictably and musically, ideal for vocals, bass, and other sources that benefit from smooth dynamic control. With the T4BLA, Black Lion Audio has refined an industry-standard design into something even more precise and reliable.
The B172A is engineered for durability and high-end performance. Housed in a 2U rackmount chassis, it features a solid build designed for long-term studio use. High-grade capacitors in the signal path and power decoupling ensure clean operation, while a well-thought-out layout makes controls intuitive and easy to adjust.
With its powerful compression options, premium components, and flexible routing, the B172A is a must-have for engineers who demand versatility and quality in a single unit. Whether shaping transients, smoothing dynamics, or applying compression in a stereo mix, this hybrid compressor delivers the tools needed for professional results.
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