Black Lion Audio T4BLA

A replacement optical gain-control component for compatible T4B-based compressors.

The component inside the compressor

T4BLA is an internal optical assembly, combining an electroluminescent panel with matched photocells. It is the gain-control element used within a compatible optical compressor circuit, rather than a standalone processor or an external effect that connects to an audio interface.

For a planned service or compatible build

The component is intended for applications that specifically accommodate a T4B-type optical unit. Compatibility should be established against the exact compressor circuit and service documentation before purchase. Similar product names or a general description of a compressor as optical are not enough to establish the correct replacement part.

Professional installation

Installation should be carried out by a qualified service technician, with any required checking and calibration completed as part of the work. T4BLA is a specialist choice for maintaining or assembling a suitable optical compressor, bringing Black Lion Audio’s optical gain-control component to the heart of that circuit. It does not include a compressor chassis, power supply or audio connections.