Aphex Systems 9621

Aphex systems 9621

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.

FEATURES and BENEFITS

• For Aphex Modular System Model 9000 Series Rack or compatible dbx 900 Series rack

• Logic Assisted Gate Circuitry - Proprietary control circuitry eliminates potential noise (chattering or clicking) irrespective of Attack speed

• Front Panel Accessible Key Monitor Headphone Jack - Allows monitoring of the key signal without disruption of the audio output

• Parametric Key Input Filters - A semi-parametric filter section allows greater Key Input application flexibility by making it possible to select and adjust both center frequency (from 30Hz to 12kHz) and bandwidth (1.7 to 9 octaves) at a slope rate of 24 db/octave

• "Straight Wire" Sound Quality - Highest grade componentry and intelligent circuit design assure highest possible audio quality with absolutely no degradation of the signal source.

• Instantaneous attack (10usec) - follows any input waveform with no loss of leading edge

• Slaving option - allows one Model 9621 to be controlled by another as a slave unit

• External Key Input

• Unparalleled distortion specifications - <0.002% typical

• 100 dB of Attenuation Range

• Excellent Circuit Stability - assures accurate settings by preventing "wandering"

• Electronically Servo-Balanced Inputs and Outputs

• Employs the proven Aphex VCA1001

APPLICATIONS

• Controlling microphone leakage in the recording studio and in 'Live' Sourd Reinforcement applications

• Adding dynamics to existing program material and dull recordings

• "Ducking" programs for voice overs and automatic level changes (paging, Conference room mic precedence, etc.)

• Reshaping sampled sound envelopes

• Creating special dynamic effects

Specifications - Aphex Model 9621 Expander / Gate / Ducker Module

INPUT

• Type Transformerless, differential servo balanced with passive 4th order RF filter

• Impedance 22k balanced, 11k unbalanced same

• Nominal Level +4 dBu -10 dBV (-7.8 dBu)

• Maximum Input Level +25 dBu +10.8 dBv (+13 dBu)

• CMRR >90dB/100Hz, >70dB/1kHz, >50dB/20kHz same

SIDECHAIN

• Gain Reduction Element Aphex VCA 1001

• Key Input Impedance 50k ohms, unbalanced

• Key Output Impedance 150 ohms unbalanced

• Maximum Key Level +21dBu

OUTPUT  

• Type Transformerless, RF filtered, differential servo balanced

• Impedance 65 ohms balanced/unbalanced  same

• Maximum Output Level: balanced +27 dBu +13 dBv (+15.2 dBu)

• unbalanced        +21 dBu +7 dBv (+11.2 dBu)

• Dynamic Range 121dB 112dB

• Bandwidth ±0.65 dB 5Hz to 65 kHz same

• Hum & Noise @ unity Gain -87dBu -94dBu

• Hum & Noise, fully off -94dBu -97dBu

• Crosstalk @ 20kHz -96dBu same

• THD @ +27dBu 0.009% same

• THD @ +4dBu 0.003% same

• IMD (SMPTE) @ +27dBu 0.007% same

• Key Listen Nominal Level (+4dBu in) +8dBm (6.3 mW into 600 ohms headphones) n/a

• Key Listen Impedance 49.9 ohms  n/a

CONTROLS

• Threshold -50dBu to +20dBu

• Attack Time 10uS to 100uS

• Hold 10uS to 100uS

• Release 40uS to 4 Seconds

• Ratio 1.2:1 to 10:1

• Range 0 to 100dB

• Frequency 30Hz to 12kHz

• Bandwidth 1.7 to 9.2 octaves with 24dB per octave slopes 

FUNCTION SWITCHES  

• Filter In / Out, External Key, Duck, Expand, In / Out (Out is bypass)

• Key Listen, Master / Slave link

OTHER SPECIFICATIONS

• Audio, Control, Power Terminations PCB edge connectors with 15 gold contacts (mates w/female connector in the 9000R)

• Power Requirements ±15VDC at 140mA (maximum)

• Dimensions:    Front Panel: 5.25" H x 1.5" W

• Circuit Board:            4.5" H x 9.5" D (10.65" D including front panel & knobs)

• Net Weight <1 lb

• Shipping Weight 2 lbs

REQUIRED HARDWARE (purchased separately)

• Module Frame 9000R Modular System required per 11 modules (3RU)

   9000PS for module combinations not to exceed 3 amps load

• Power Supply 9001PS same as 9000PS with dbx 900 Series module capability

   9005PS for module combinations not to exceed 5 amps load (3RU)