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The 9621 is an Expander / Gate / Ducker module which installs in one space of the Aphex Model 9000 rack or compatible dbx 900 series rack.

The Model 9621 Expander / Gate / Ducker Module represents the absolute latest technological advances in expander design. Like its predecessor, (Model 9611) the Model 9621 delivers true expansion, as well as a degree of user adjustability that permits unparalleled Gating and Ducking Action. However, a significant improvement in this model over its predecessor is the addition of Logic Assisted Gate™ circuitry. This newly developed patented control system combines sophisticated level detection with logic generated control voltage, assuring positive, stable, and accurate triggering, irrespective of attack time.

The Model 9621also features switchable Parametric Key input filters that permit user shaping of the keying signal through selectable frequency and variable bandwidth controls. A convenient front panel headphone jack has been added to allow monitoring of the Key Input without disruption of the audio output.

Best of all, the Model 9621 continues in the Aphex tradition of providing transparent performance to achieve the highest possible sound quality of your system. Employing the Aphex 1001 VCA guarantees significantly lower distortion than any other VCA, while delivering superb transient response, stability, and low noise.