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| APPLICATIONS |
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Control audio leakage in stage and
studio mixing applications |
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Increase dynamics of any program
material - recorded or live |
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Manipulate external audio program
for voice-overs and automatic level changes |
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Key external sounds to any audio
track |
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Reshape any sound envelope |
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Control feedback in live sound applications |
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Create special dynamic effects |
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| Features |
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Logic Assisted Gate Circuitry:
combines sophisticated level detection with logic generated control voltage
assuring positive, stable and accurate triggering regardless of attack time.
Patents pending. |
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Ultra-pure Audio Path: Proprietary
Aphex VCA 1001 voltage controlled attenuator assures the highest audio quality,
speed and freedom from DC control feed through (no clicks regardless of attack
time). |
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Parametric key input filters
- 24 dB/octave: Switchable parametric filters with frequency and bandwidth
controls allow user greater ease of frequency selection. |
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Key Monitor headphone jack:
provides ability to monitor key input without disrupting audio output. |
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Dedicated downward expander mode:
allows high resolution of ratio adjustment: from 1.2:1 to 10:1. |
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119 dB dynamic range. |
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Switchable ducking mode:
Fully adjustable control of trigger threshold, attack time, hold time, release
time, expander ratio, and attenuation range. |
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Simple and accurate metering system. |
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Improved servo-balanced input and
output circuits. |
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5 year limited warranty. |
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+4/-10 operation, rear panel selectable. |
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Hardwire relay bypass: remote controllable. |
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Designed and manufactured in the
U.S.A. |
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| BENEFITS |
|
Best commercially available
noise gate provides unmatched performance in all parameters
- Lowest distortion (0.005% typical)
- Widest frequency response (5 Hz 100kHz)
- No clicks, regardless of attack speed
- Ultra-quiet and reliable |
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Fast setup, stable, reliable, accurate |
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Simple and intuitive to operate |
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Rugged and durable construction |
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High dynamic range is most suitable
for quality digital and analog recording applications |
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Versatile - can be used in all recording
and live performance applications |
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Best user-value in terms of features,
performance quality, and durability relative to purchase price |
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| APPLICATION
HINTS |
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Controlling Leakage In the Studio
- The 622 is very useful to prevent one instrument from bleeding over into
the track of another during tracking or mixing. The Key Filters can be used
to tune the key signal so it responds to the desired instrument. Cymbals and
bass drum can easily and effectively be kept out of a snare track, for example. |
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Reducing Feedback On Stage Microphones
- By using the 622 as a gate on stage mics, they will be turned off when the
performer steps back to take a solo. Pickup from the monitors and other instruments
will be eliminated. |
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Keying External Sounds To A Percussion
Track - The bass guitar or reverb or low frequency oscillators can be
synced exactly to the bass drum. This can tighten or fatten up the rhythm
track. |
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Reducing Tape Noise - The
622 can effectively reduce tape hiss by gating channels so no noise is being
added to the mix when no signal is present. This can result in a tremendous
reduction of noise on a multi-track mix. |
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Ducking Programs For Voice-overs
and Paging - The ducking action of the 622 can automatically reduce the
level of a music track whenever a voice (or other signal) is present, becoming
an automatic mixer. The amount of ducking or attenuation is set with the RANGE
control. |
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Adding New Dynamics To Existing
Program Material - Because of the variable ratio control, the 622 can
be used to spice up the dynamics of a sound track. Low ratios (1.2:1-4:1 )
will multiply the existing dynamics, adding some punch and life to a boring
track. |
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Reshaping Sampled Sound Envelopes
- Once a sound has been captured in a sampler, the 622 can be used to change
the envelope, creating new sounds. Attacks can be slowed, dynamics expanded
or even reversed with the comprehensive controls on the 622. |
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| Using
the Aphex Model 622 |
| PLEASE
REFER TO THE FIGURES BELOW FOR CALLOUT NUMBERS |
|
|
|
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| 1. |
Filter Switch - Switches
the key filters completely out of the circuit for flat frequency response
as well as eliminating the circuit in the control path which would slow
down response. |
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| 2. |
LED Function Display
- Two LED Display instantly shows status of each channel of the 622,
"open" or "closed" state. |
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| 3. |
In/Out - Each channel
of the 622 may be individually switched in or hardwire bypassed. |
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| 4. |
External Key Switch
- Allows use of a rear panel jack input to the key circuits so the 622
can be controlled from an external source. |
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| 5. |
Key Listen - Switches
the key signal to the main audio output, making adjustments of the filters
and/or the external key very easy. |
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| 6. |
Expand - Switch enables
expander function. |
|
| 7. |
Ducking - Inverts operation
for voice overs and special effects. |
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| 8. |
Master/Slave Switch
- Slaves Channel 2 to Channel 1 control signal. |
|
| 9. |
Parametric Key Filters
- Frequency: Adjusts center frequency of the key filter from
30Hz to 12kHZ. Bandwidth: Adjusts bandwidth of filter
in Octaves from 1.7 (narrow) to 9.2 (wide). |
|
| 10. |
Threshold - Adjustable
from -50 to + 20dB. |
|
| 11. |
Attack Time - Variable
from 10 microsec (with no clicks!) to l00mSec. |
| |
| 12. |
Hold - Allows a programmed
delay of 10mSec to 5Sec before the release function is activated. |
| |
| 13. |
Release Time - Adjustable
from 40msec to a full 5 Seconds. |
| |
| 14. |
Ratio - The ratio of
downward expansion may be varied from 1.2:1 through low ratios for accentuating
musical dynamics to 10: 1 for more dramatic effects. |
| |
| 15. |
Range - Sets the amount
of downward expansion (attenuation) from 0 to 100dB. |
| |
| 16. |
Key Monitor Headphone Jack
- Allows monitoring of key input without disrupting main audio output. |
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 |
|
|
| 17. |
RF
Filtered AC Mains
- Assures quiet operation. |
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| 18. |
Servo-Balanced Inputs and
Outputs - For highest quality signal path, maximum common-mode hum and noise rejection
and short-circuit proof outputs that can instantly be used balanced
or single ended, either Pin #2 or #3 may be used as "High". |
|
| 19. |
Key In Jack -
For connecting an external source for keying (See #4). |
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| 20. |
Operating Level Switch -
Switches the nominal operating level from -10dBV to +4dBu for optimizing
headroom performance. |
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| 21. |
Remote Control Bypass
- RJ11 Jack provides remote control of bypass relay
with a simple closure to ground, tally provides status of relay. |
|
| 22. |
Sidechain Out -
A single ended buffered copy of the audio input to feed to other devices
without using up patchbay or mixer space. |
|
|
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| Back
View, continued > |
 |
|
|
| Aphex Model 622 - BLOCK DIAGRAM |
 |
|
SPECIFICATIONS - Aphex Model 622 - LOGIC ASSISTED EXPANDER / GATE |
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| INPUTS |
|
| |
Type |
RF Filtered true instrumentation
differential balanced |
| |
Input Impedance |
22 k-ohms, balanced |
| |
Nominal
operating level |
+4 dBu / -10dBV switch
selectable |
| |
Maximum
input level |
+27 dBu |
| |
CMRR |
60 dB |
| OUTPUTS |
|
| |
Type |
Electronically servo-balanced
transformerless.
May be operated single-ended or balanced |
| |
Output impedance |
65-ohms, balanced |
| |
Maximum output level |
+27 dBu balanced, +21
dBu unbalanced |
| |
Bandwidth |
5 Hz to 100 kHz, +0,
-0.2 dB |
| |
THD @ +20 dBu |
0.006% |
| |
THD @ +4 dBu |
0.003% |
| |
IMD (SMPTE) @ +10 dBu |
0.006% |
| |
Noise and hum at unity
gain |
-87 dBu |
| |
Noise and
hum fully off |
-92 dBu |
| |
Crosstalk
@ 20 kHz |
-96 dBu |
| |
KEY LISTEN
output |
Front panel
mini-headphone jack |
| SIDECHAIN |
|
| |
Gain reduction element |
APHEX 1001 VCA |
| |
Key input impedance |
50 k-ohms, unbalanced |
| |
Key output impedance |
150-ohms, unbalanced |
| |
Maximum Key level |
+21 dBu |
| CONTROLS |
|
| |
Threshold |
-50 dBu to + 20 dBu |
| |
Attack time |
FAST (10µSec)
to SLOW (100 mSec) |
| |
Hold |
10 mSec to 5 Sec |
| |
Release |
40 mSec to 5 Sec |
| |
Ratio |
1.2:1 to 10:1 |
| |
Range |
0 to 100 dB |
| |
Frequency |
30 Hz to 12 kHz |
| |
Bandwidth |
1.7 Octave - 9.2 Octave,
24dB/Octave |
| FUNCTION
SWITCHES |
|
| |
Filter in/out |
Key external |
| |
Key Listen |
Master/slave link |
| |
Channel In/Out |
Expand |
| |
Duck |
|
| INDICATORS |
| |
Status2 LED display
showing: |
Closed (closing or closed)
and Open (holding or open) |
| |
One LED indicator for
each function switch |
| POWER |
| |
Line
Voltage Input |
90 to
250VAC 50-60Hz |
| |
Power
Requirements |
25 Watts |
| |
Connector |
Standard
IEC receptacle, with fuse, voltage select, and RF filter |
| PHYSICAL |
|
| |
Dimensions |
1.75" H x 19"
W x 9" D (44.5mm
x 482.6mm x 228.6mm)
allow for connectors and wire dress |
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