The Black Lion Audio B172A is a hybrid dynamic processing unit that combines two of the most iconic compressor topologies in recording history into a single 2U rack chassis: an American FET fast-acting limiter (inspired by the classic 1176LN) and an electro-optical tube compressor (inspired by the LA-2A). Rather than forcing engineers to choose between two separate outboard processors, Black Lion Audio delivers both circuits in one unit, complete with custom transformers and a routing matrix that redefines hybrid tracking workflows.

The stand-out feature of the B172A is its matrix signal-routing switch. With a flip of a toggle, you can instantly swap the internal order of the processors (FET $\rightarrow$ Opto or Opto $\rightarrow$ FET), or decouple them entirely for independent dual-mono processing. When paired with Cinemag transformers on the optical side and Black Lion's custom Chicago-wound transformers on the FET side, the B172A offers both the lightning-fast transient peak control of FET compression and the smooth, musical optical leveling of tube opto circuits.

Two classics in one chassis, the B172A marries the Seventeen version of the legendary “76” FET limiter with their take on the renowned “2A” tube optical compressor. Whether you use the FET and opto separately — or in series, where one catches the audio’s peaks and the other provides the heavy compression — the B172A will blow you away with its incredible sound and versatility. The B172A’s Dual Mono Link makes it easy to route your signal through the 17 and 2A circuits in any order. Painstaking effort went into choosing the best transformers needed for each circuit. Spec’d with a CineMag input transformer on the 2A side, BLA’s own Chicago-wound output transformers on both circuits, high-grade signal path and decoupling capacitors, the B172A gives you ultra-convenient access to a pair of classic dynamics processors while also providing a valuable signal processing tool never before available in a single chassis.

Features

• 76- (Seventeen) and 2A-style compression in a single 2RU chassis

• A/B, B/A, and Independent signal routing switchable on faceplate

• Cinemag 2A input transformer

• Chicago-wound 76 and 2A output transformers

• Custom-designed Black Lion Audio T4B opto element

• High-grade signal path and power decoupling capacitors

• Stereo linkable