 |
622
Logic Assisted Expander / Gate |
| |
| The
Aphex Model 622 is a dual channel dynamics processor, incorporating
new, proprietary detection circuitry that provides the most
reliable, accurate, and stable operation of any gate. The model
622 also offers the highest quality audio path, flexible high
"Q" key filters, key headphone outputs on the front
panel and remote controlled bypass relays. All these features
make the Model 622 the choice of professionals in recording,
broadcast and sound reinforcement. |
|
Applications
|
•
|
Control
audio leakage in stage and studio mixing applications |
| • |
Increase
dynamics of any program material - recorded or live |
| • |
Manipulate
external audio program for voice-overs and automatic level changes
|
| •
|
Key external sounds to any audio track |
| • |
Reshape
any sound envelope |
| • |
Control
feedback in live sound applications |
| • |
Create
special dynamic effects |
| Features |
| • |
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. |
| • |
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). |
| • |
Parametric
key input filters - 24 dB/octave: Switchable parametric
filters with frequency and bandwidth controls allow user greater
ease of frequency selection. |
| • |
Key
Monitor headphone jack: provides ability to monitor
key input without disrupting audio output. |
| • |
Dedicated
downward expander mode: allows high resolution of ratio
adjustment: from 1.2:1 to 10:1. |
| • |
119
dB dynamic range. |
| • |
Switchable
ducking mode: Fully adjustable control of trigger threshold,
attack time, hold time, release time, expander ratio, and attenuation
range. |
| • |
Simple
and accurate metering system. |
| • |
Improved
servo-balanced input and output circuits. |
| • |
5
year limited warranty. |
| • |
+4/-10 operation, rear panel selectable. |
| • |
Hardwire relay bypass: remote controllable. |
| • |
Designed
and manufactured in the U.S.A. |
| 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 |
| • |
Fast setup, stable, reliable, accurate |
| • |
Simple
and intuitive to operate |
| • |
Rugged
and durable construction |
| • |
High
dynamic range is most suitable for quality digital and analog
recording applications |
| • |
Versatile
- can be used in all recording and live performance applications
|
| • |
Best
user-value in terms of features, performance quality, and durability
relative to purchase price |
| Application
Hints |
| • |
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. |
| • |
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. |
| • |
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. |
| • |
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. |
| • |
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. |
| • |
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.
|
| • |
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. |
| Using
the Aphex Model 622 PLEASE
REFER TO THE FIGURES BELOW FOR CALLOUT NUMBERS |
| 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. |
| 2 |
LED
Function Display - Two LED Display instantly shows status of
each channel of the 622, "open" or "closed"
state. |
| 3 |
In/Out
- Each channel of the 622 may be individually switched in or
hardwire bypassed. |
| 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.
|
| 5 |
Key Listen - Switches the key signal to the main audio output,
making adjustments of the filters and/or the external key very
easy |
| 6 |
Expand - Switch enables expander function. |
| 7 |
Ducking
- Inverts operation for voice overs and special effects. |
| 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. |
| 17 |
RF
Filtered AC Mains - Assures quiet operation. |
| 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). |
| 20 |
Operating
Level Switch - Switches the nominal operating level from -10dBV
to +4dBu for optimizing headroom performance. |
| 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. |
.
|
Aphex Model 622 - BLOCK DIAGRAM |
|
| SPECIFICATIONS
- Aphex Model 622 - LOGIC ASSISTED EXPANDER / GATE |
| 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 leve |
l
+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 |
|
|
|
|
