Derived from the original Neve 2254 compressor, circa 1969, the 33609 stereo bus compressor/limiter utilizes a bridged-diode gain reduction circuit and many custom transformers.
The uniquely musical character of this circuit has made the 33609 a studio standard since its release.
The completely stepped-controlled 33609 is made up of separate compression and limiter sections, each with their own threshold, recovery and bypass controls. Two of the recovery selections for each section are dedicated to a program dependent auto release. The compressor section also offers five ratio selections and 20 dB make-up gain, while the limiter offers a fast or slow attack. The mono/stereo switch couples and decouples the left and right gain reduction elements.