T4Bx

A Modern Take on a Classic Component
The T4Bx was developed to capture the unmistakable behaviour of the original T4B photocell used in the legendary Teletronix LA-2A. Where vintage units varied widely due to the nature of their electroluminescent panels, the T4Bx brings that same musical response with dramatically improved consistency and reliability.

Precision-Matched for Identical Performance
IGS engineered the T4Bx by carefully selecting, testing, and matching every internal component. This ensures that each unit performs nearly identically — a breakthrough for engineers who rely on predictable compression curves, tighter stereo imaging, and repeatable results.

Enhanced Reliability Without Sacrificing Tone
The original T4B’s variability contributed to its charm, but it also introduced inconsistencies from unit to unit. The T4Bx retains the smooth, organic opto compression character while eliminating unwanted variations, making it ideal for modern workflows where precision matters.

Drop-In Compatible With Classic Opto Designs
All IGS opto compressors — including the ONE LA500 and One Leveling Amplifier — ship with the T4Bx installed. It remains fully interchangeable with the original Teletronix T4B, giving engineers the freedom to experiment, compare, or maintain vintage hardware with confidence.

Designed for Today’s Studios
By blending tradition with modern engineering discipline, the T4Bx ensures that the legendary LA-2A-style sound remains accessible, stable, and trustworthy across any production chain.