The 941A encoder and the 942A decode modules provide more than 40 dB of additional dynamic range for typical limited bandwidth media such as cart machines, telephone/PPT lines, videotape audio tracks and low bandwidth digital systems.

Patented RMS detection circuitry makes the system virtually immune to phase shift related tracking problems. The 941A incorporates two channels of Type II encoding, while the 942A incorporates two channels of Type II decoding. A typical application of multiple 942As is in the on air studio where outputs of multiple decks are decoded.

Calibration trims are accessible at the front panel to allow readjustment to custom studio levels.