OCL-2 Condensed Operating Instructions

(Click on front panel for larger photo)

THRESHOLD:The amount of compression is adjustable over a wide range of signal levels (off to -20dB), to allow compression of +4dBu and -10 dBV source material.

RATIO: The compression ratio is continuously variable from light compression to limiting (1.5:1 to 15:1).

OUTPUT: The tube line stage will supply up to +20dB of gain make-up after compression.

METER: The VU meter can indicate input level, output level, or gain reduction. Input and output levels are referenced to +4dBu. The meter Zero trim for gain reduction is located below the selector switch.

IN/BYPASS: 'Hard' bypass switches for comparing the processed sound directly with the original source.

LINK/SPLIT: Links the two channels for stereo operation. When linked, the threshold and dynamics processing (fast, preset and manual modes) are controlled entirely by Channel 1. The ratio and output controls for the two channels should be set to the same values.

MODE: Selects the three sidechain operating modes for dynamic control:

FAST: The optical element operates with very fast attack and release times, which are peak-averaged by the rapid operation of the optical cell.

Presets: These six attack/release time settings are identical to the presets on the classic Fairchild 670 limiter. Presets 5 and 6 are program-dependent.

Manual: The attack and release times are continuously variable from 1-40ms and 0.1-2s respectively.

SIDECHAIN INSERTS: TRS 1/4" jacks for inserting an outboard EQ into the sidechain. Use for frequency-dependent compression or de-essing. Tip is send, and Ring is return. In Link mode, both inserts are active.

INPUTS and OUTPUTS: The XLR and 1/4" connectors for each channel are wired in parallel. Pin 2 (Tip) is positive phase and Pin 3 (Ring) is negative phase. Input impedance is 10kohms. Output impedance is 600 ohms.