Cla-2a Compressor Limiter ›

The CLA-2A is a program-dependent optical compressor/limiter modelled on the vintage Teletronix LA-2A. It’s known for smooth, musical leveling with program-dependent attack/release characteristics produced by an electro-optical gain reduction element (optical cell). The “CLA-2A” name typically refers to the Waves CLA-2A plug-in (Chris Lord‑Alge preset/voicing) or generic LA-2A-style units; core behavior and controls are the same across implementations.

You cannot set the attack or release manually. This is terrifying for control freaks, but liberating for mixers. The optical cell responds in a "logarithmic" way. The harder the transient, the faster the initial grab; the quieter the signal, the slower the release. This mimics the human ear's natural compression. For bass guitar, this means no "pumping." For vocals, it means syllables are smoothed without the "ducking" sound of a fast FET compressor.

(Use these as templates; adjust by ear.) cla-2a compressor limiter

The "Sticky" Quality This is the compressor that makes vocals sit on top of a mix without sounding squashed. The LA-2A circuit naturally applies a 3:1 to 10:1 ratio depending on the input. As you hit it harder, the ratio increases automatically. This program-dependent behavior is its magic.

CLA's "Silky" Mod Chris Lord-Alge added a high-frequency boost that kicks in only when compression occurs. As the compressor clamps down, it adds a subtle airy top end. This prevents the classic LA-2A from sounding "dark" or "muddy" on dense mixes. CLA's "Silky" Mod Chris Lord-Alge added a high-frequency

Technically, the LA-2A is always a "leveling amplifier," but this switch changes the ratio behavior:

To understand the CLA-2A, you must first respect the original LA-2A (Leveling Amplifier). Introduced in the 1960s, the LA-2A utilized an electro-luminescent panel and a photoresistor to control gain reduction. Unlike VCA or FET compressors (like the 1176), the optical circuit of the LA-2A is inherently slow and musical. It doesn't "grab" transients; it absorbs them. Enter Chris Lord-Alge

The original hardware became famous for three characteristics:

Enter Chris Lord-Alge. While the "Blackface" or "Silver" original LA-2As are prized, CLA wanted more. He had specific vintage units that sounded slightly different from the stock spec—units with a unique high-frequency sheen and a faster attack curve. Waves collaborated with CLA to model not just a generic LA-2A, but his specific, prized silver unit. The result is the CLA-2A: a compressor that retains the optical smoothness but adds a modern, polished edge suitable for 21st-century loudness wars.

In the pantheon of audio processing, few pieces of gear have achieved the mythic status of the Teletronix LA-2A. For over five decades, this optical tube compressor has been the secret weapon behind countless hit records, famous for its ability to glue a mix together with a velvet-glove level of control. In the modern era of digital audio, one name stands above the rest in recreating this magic: the CLA-2A Compressor Limiter by Waves.

Named after the legendary mixing engineer Chris Lord-Alge (whose surname is synonymous with aggressive, radio-ready rock and pop mixes), the CLA-2A is not merely a clone; it is a signature evolution. This article explores everything you need to know about the CLA-2A, from its analog heritage to its modern digital workflow, and how you can use it to transform your tracks.