Aphex Broadcast Audio Processor 2020Mk II User manual

The Aphex Model 2020MkII Broadcast Audio Processor
*Denotes Aphex proprietary circuitry
**The white paper on “FM Coverage Improvements with the 2020” by Donn Wehrbach, our VP of Engineering is available for downloading from our website.
***For a complete copy of these reviews visit our website or call Aphex for a copy of the 2020 Reviews brochure.
• Frequency Discriminate Leveler*
• Dynamic Verification Gate*
• Sticky Leveler*
• Jump Ahead*
• Adjustable Rate
• Adjustable Gain Correction Range
Leveling Multiband Compression
•Wave Dependent Compressor*
•Post Crossover Multiband Technique*
•4 Adjustable Crossover Bands
•Adjustable Drive
•Band by Band Release Times
•Adjustable Band by Band Summation Mix
•Selectable L-R Linking (None, Elastic, Hard)
•Selectable Band to Band Elastic Linking
Works like the perfect board
operator smoothly riding gain
without any processing artifacts
(pumping, breathing, ducking,
hole punching).
Other processors sound dissected or synthetic by enhancing artifacts and
squashing out natural details. The MkII Multiband remains cohesive and
natural even with the heaviest processing. Its flexibility offers a full palette of
sonic textures.
The Model 2020 was hailed worldwide as the FM processor of choice for stations where sound quality and loudness are
equally important. Review after review talked about “clarity”, “naturalness”, “loudness”, “lack of annoying artifacts”, “great
value”, “deep, rich bottom end”, “clear unclouded midrange and highs”- the list of accolades went on and on***. Now
with new circuit designs, improved processing algorithms and new features the reviewers will have to find new superlatives
for the 2020MkII.
In addition to the superb audio quality, the 2020MkII is very functional and easy to use. Other features include:
•Password security system •Programmable and automatable for day-parting •Headphone Input/Output Monitor
•Remotely and locally controllable •RDS input/output and dual composite outputs
•Can also operate in a dual mono configuration - a cost and space-effective idea for single channel broadcasters
•Insert loop for adding additional processing such as the Aphex Aural Exciter and Big Bottom
•Digital I/O option includes our patented Drift Stabilized A to D Converters*
•Ultra-precision oven-controlled crystal oscillator option
Additional Features
Since 1975 Aphex Systems has designed and manufactured
innovative signal processing equipment for professional
applications. Many of our processors have become the de
facto standard of the industry in their particular categories -
(Dominator®, Compellor®, Aural Exciter®, Big Bottom®, etc.).
It is with this heritage that we undertook the development
of the original 2020. After five years in development and 15
new proprietary techniques, we created the finest sound-
ing FM processor available. Two years later and with three
new proprietary techniques the 2020MkII was born. Aphex
research ensures that each and every link in the 2020MkII
processing chain outperforms any comparable link in any
competitive product. When the links are combined the MkII
is vastly superior.
Processing in the 2020MkII - Vastly Superior
Our Press
Model 2020MkII Processing Chain

Multiband Compression Screen (Remote Control Software)
For FM, TV, DAB,
Webcasting, and
CD/DVD Mastering
Limiter Pre-emphasis Limiter and
Low Pass Filter PPDM Stereo Generator
•Split Band Clipper*
•Automatic Limit Threshold*
•Phase Coherent Crossover*
•Adjustable Density
•Adjustable Bass Processing
•Split Band Optical Limiter*
•Distributed Pre-Emphasis Filter*
•Adjustable Brilliance
•Overshoot Compensated Low Distortion
Low Pass Filter*
•Parallel Path Digital Modulation*
•Selectable Mode
•Adjustable Pilot Level
•Dual Composite Outputs
•RDS Direct Interface
Interacts intelligently with Multi-
band, to easily achieve desired
loudness. Tight, punchy,
abundant bass is unmatched.
2020MkII is the only processor
that holds voice equal in
loudness to music program.
Perfect pilot protection with no
spurious output. Extended high
frequencies & transients for a
natural, open sound without
harshness or edginess. Better
sound and better coverage.
Perfect modulation - no need for
composite clipping. Accurate,
wide, stable stereo image.
Proven extended coverage.**
Remote Control
The Model 2020MkII is totally controllable locally
via the front panel controls or remotely via RS232
and modem. The newly improved Remote Software
is Windows®98 & 2000 compatible.
Presets, Day & Day of Week Parting
The 2020MkII has eight factory presets and 16
user definable presets. All operating parameters
can be modified and saved in a user preset.
Day parting can be programmed for up to four
changes of presets per day. In addition, each day
of the week can be programmed to have its own
day parting schedule of presets.
Options - Buy only what you need!
The basic unit has flat (no pre-emphasis) processing
with analog I/O. Option 1 adds AES/EBU digital I/O.
Option 2 adds a pre-emphasis limiter and low pass
filter. Option 3 adds the pre-emphasis limiter, low
pass filter and PPDM stereo generator. Option 4
adds an Ultra-precision oven-controlled crystal
oscillator to Option 3.
Competition for loudness impacts audio quality. The 2020MkII
rewrites that formula through the utilization of 18 exclusive
techniques (patented and patent pending) which increase
density beyond any other processor while retaining naturalness
and musicality.
Another advantage of the 2020MkII is the stability and purity of
the signal, resulting in extended coverage and more consistent
coverage in shadow areas.
The 2020MkII comes with 8 sample presets that many will find
perfect for their station’s sound. Others will find these suitable
as the starting point to completely customize a sonic signature
from the vast palette of control over processing parameters.
Loudness vs. Cleanliness
Increased Coverage**
Customize Your Own Sound
For a demonstration at your facility contact Aphex today

11068 Randall Street
Sun Valley, CA 91352, USA
Tel: [phone] • Fax: [phone]
www.aphex.com
Improving the way the world soundsSM
•The Compellor provides a clean consistent sound when used as
a pre-processor
•Remote controllable relay hardwire bypass
•Fader settings are less critical and the sound of the station will
not change from announcer to announcer
•For television, level changes between programs and commercials
will be smoothed out without affecting audio quality
•Servo balanced XLR in/outs for maximum audio quality
•Cable television operators can offer consistency in level when a
customer switches between channels
•Two channel Frequency Discriminate Leveler varies its attack time
•Dynamic Verification Gate prevents pumping and breathing
during short program pauses
•Dynamic Recovery Computer accelerates compressor recovery
under complex program to preserve natural sound on transients
•Also available in mono with built in Aural Exciter™- Model 323A
•The Aural Exciter increases presence, clarity, speech intelligibility
and detail without distortion or overmodulation
•By pre-processing the audio, compensation can be made for the
degradation the signal will receive further down the chain
•Single-ended process that can be applied at any point in the
audio chain before the peak limiter, and needs no decoding
•Total flexibility in “tuning”the Aural Exciter to your needs
•Patented Harmonic Generation Process can actually increase
bandwidth without increasing level
•Built-in single ended noise reduction can improve noisy sources
•Spectral Phase Refractor circuitry improves bass without eq.
•No unnatural distortion by-products
•Servo balanced XLR inputs and outputs for maximum audio quality
•Remote controllable relay hardwire bypass
•The Dominator provides an absolute peak ceiling adjustable in
.2dB steps over a 34dB range. Equipment following the
Dominator (STL,telco lines, stereo generators, uplink transmitters,
etc.) may be driven to maximum input level without overload
•Model 722 is for applications requiring pre-emphasized limiting,
such as STL’s, cable systems, satellite uplinks
•Greater consistency of peak audio levels, maximized S/N ratios,
and highest possible resolution (more bits) in the digital domain
•Patented Automatic Limit Threshold varies ratio of bandlimiting
to clipping
•Remote controllable relay hardwire bypass
•Switchable low to mid and mid to high crossover frequencies
•Servo balanced XLR ins and outs for maximum audio quality
•Model 722 - switchable pre- and de-emphasis, 50/75µsec/flat
•Model 720 - flat only •104dB Dynamic Range
•The Model 720 is without emphasis circuitry at a lower cost
Aphex, Aural Exciter, Big Bottom, Compellor, Digicoder, Dominator, Easyrider and Expressor
are trademarks of Aphex Systems, Ltd. All Aphex Products are ETL listed or pending.
The Model 2020MkII contains the following proprietary circuitry: Four Band Wave Dependent Compressor,
Post Crossover Multiband Technique, Split Band Clipper, Parallel Path Digital Modulation Stereo Generator,
Phase Coherent Crossover, Drift Stabilized A/D Converter, Frequency Discriminate Leveler, Sticky Leveler,
Dynamic Verification Gate, Distributed Pre-Emphasis Filter, Split Band Optical High Frequency Limiter, Low
Distortion Overshoot Compensated Low Pass Filter.
The Model 2020/2020MkII, 320A/323A, 250, 720/722 are covered by one or more of the following patents:
4150253, 4578648, 4633501, 4843626, 4939471, 5115471, 5155769, 5334947, 5359665, 5422602,
5424488, 5450034, 5463695, 5483600, 5485077, 5612612, 5737432, 5848167, 5896458, 5898395 and
5930374. Other U.S. patents issued and/or pending.
For detailed specifications on these or any other Aphex products call, fax, e-mail or write us.
Aphex reserves the right to make changes to its products without prior notice. Rev:04-15-01 5k
APHEX 250
Aural Exciter®III
APHEX 120A
1 x 4 Distribution Amp APHEX 720/722
Dominator™II APHEX 320A
Compellor®
Loading an output with multiple devices may cause
noise, distortion and reliability problems. Y-cords and
splitters are not the solution, a high quality distribution
amp is. The Model 120A has one-input with four inde-
pendent outputs. The inputs and outputs are trans-
formerless and servo-balanced, allowing interface with
balanced or unbalanced equipment (or even a dead
short) without affecting the other outputs.
Interfacing a -10dBV unbalanced device with a +4dBu
balanced device must be done properly to avoid level mis-
matches, noise, and distortion problems. The Model 124A has
four discrete channels, two channels are -10dBV inputs to
+4dBu outputs and two channels are +4dBu inputs to -10dBV
outputs. The -10dBV outputs are active for low impedance
and the +4dBu inputs are transformerless servo-balanced,
allowing the interface to be transparent and problem free.
APHEX 124A
-10dBV/+4dBu Interface Box
Aphex is proudly American.... 100% owned,
engineered and manufactured in the U.S.A.