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• Frequency Discriminate Leveler
No bass pull-back in music
• Dynamic Release Computer
Adds compression intelligently
smoothing out transitions.
• Dynamic Verification Gate
adds greater transparency
• Silence Gate
Locks gain when audio stops
• Process Balance
Lets you have any combination
of leveling and compression
• True Bypass
No electronics in bypass
• AES3 I/O
up to 96kHz
• Analog I/O
Fully professional balanced
• High Reliability
Famous Aphex engineering
• Stereo & Dual Mono
Use as two separate channels
or linked for stereo
• Source Select
Chose digital or analog input
• Dual Outputs
Use both digital and analog
outputs at the same time with
either input selected
Dual Mono/Stereo Automatic Level Controller
with Digital and Analog I/O
w w w . a p h e x . c o m
The World Standard
Since the introduction of the original
Compellor in 1983, no other audio level
controller has met with such success.
Around the world, in broadcasting, record-
ing or sound reinforcement, the Compellor
is specified more than any other level
controller.
Leading Aphex Technology
The Compellor circuits are totally unique.
By throwing away all conventional design
ideas, we created audio processing with
unprecedented sound transparency, yet is
exceedingly effective at controlling levels.
Because our designs are patented, no
other company has been able to match the
performance. Algorithms like our exclusive
“DVG”, “DRC”, and “FDL” have yet to find
any rivals.
Unmatched Reliability
Aphex engineering and manufacturing
produces products that last and last with-
out need for repairs or calibration. Some
Compellors have literally been in 24-hour
use in the same rack for a decade or
longer! When you specify a Compellor, you
know it will do its job flawlessly and give
you peace of mind.
Digital Advancements
The first Compellor was introduced in 1983
as an analog product. Because of their
advanced technology, most of those older
units are still in regular use. Since that time,
newer models have been produced, still in
analog form. Digital technology of today
promises many improvements in user
interfaces, and sometimes in sound qual-
ity, but not in audio processing algorithms.
No digital processor can match an analog
Compellor for sound quality and effecive-
ness. Nevertheless, many of today’s sys-
tems need a Compellor that can interface to digital
audio. With the model 320D, Aphex brings you just
that. You get all the advantages of the analog proces-
sor with AES3 connectivity.
Compression - Leveling - Limiting:
A Very Brief Tutorial
Two properties of audio that can cause problems are
the average level (the “loudness”), and unpredict-
able peaks that can clip. The Compellor handles
both problems for you, fitting the sound into an ideal
sound envelope package.
The Compellor’s “Frequency Discriminate Leveler
(FDL)” section with the “Dynamic Verification Gate
(DVG)” and the “Silence Gate (SG)” slowly corrects
the volume level of an audio stream with very com-
plex algorithms that hide it’s work. It works differently
at different frequencies, for example. It locks up when
the sound stops, and resumes instantly when sound
reappears. When you listen, you know the levels are
made more even, but you don’t perceive the levels
are shifting.
The Compellor’s Variable Slope Compressor with
the “Dynamic Recovery Computer” and the “DVG”
work on top of the leveling platform to add adaptable
compression that helps match the texture of chang-
ing audio sources. Again, you don’t hear “pumping”
or other compressor artifacts. Just very natural sound
that is evenly consistent in loudness.
The Compellor’s limiter acts on peaks that shoot
beyond typical audio crest factors. Extremely peaky
sounds will be brought into an envelope that is easy
to handle by any analog or digital recording or trans-
portation medium including digital codecs.
Typical Uses
Broadcast pre-processing, MP3 encoding, Record-
ing, Installed and Mobile Sound, DAW Input, Mas-
tering, Satellite Uplinks, Home Stereo, Ham Radio,
Background Music, Tape Duplication, Cable TV.
Features
320D Compellor
®
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®
C US
59887
Aphex Systems Ltd. • 11068 Randall St., Sun Valley, CA 91352. Tel: (818) 767-2929 Fax: (818) 767-2641 Email: sales@aphex.com . Aphex
and Compellor are registered trademarks.
S Y S T E M S
Improving The Way The World Sounds