P4800 System Processor
with Soundplex™ Digital Signal Processing
More Than Just Another DSP.
These days, it seems like everyone's talking about DSP. Installed sound publications
are filled with ads claiming the fastest, the easiest, the most intuitive DSP product
you can imagine. Trade shows are packed with manufacturers offering the latest and
greatest black boxes.
Different day, different model number. Same old approach.
Soundplex™ Digital Signal Processing may come as a surprise.
It's a different take on DSP. Developed for you, by Shure. Designed from the
perspective of real-world users, Soundplex products think the way you do. The
audio system unfolds familiarly on the screen. The interface actually makes sense.
Five minutes with a Soundplex product, and you'll wonder why you ever needed a
manual. We're talking zero learning curve.
Because you have better things to do with your time than obsess about DSP.
Introducing the P4800 System Processor — with Soundplex DSP.
Like the DFR11EQ, the P4800 delivers an impressive combination of value, features
and processing power. This flexible, new System Processor from Shure is optimized for
small- to medium-sized installed audio systems. And because it's a Shure product, it's
essentially bombproof. But you knew that.
What you don't know is inside this brochure.
Full Complement of Processing Blocks.
The P4800 has all the DSP processing you need to ensure the highest quality audio, from basic functions like
graphic or parametric EQ to advanced dynamic processing that delivers consistent audio quality no matter who steps up to the microphone.
Choose from a variety of EQ options to deliver clear, intelligible speech. A processor toolbox with 10and 30-band graphic, and eight varieties of parametric EQ is available at your fingertips. All EQ blocks
provide the ability to import and view SIA- Smaart® and TEF TM measurements while tuning the system.
Attack feedback right when it starts using the same powerful
algorithm found in the DFR11EQ.
feedback reduction
• Automatically deploys unobtrusive notch filters that immediately control problem frequencies
• Five or ten band DFR blocks available
Automatically attenuate background music for public address or paging using the
ducker block.
Protect your amplifier and speakers from sudden, unexpected increases in signal level using the
versatile limiter and new Peak Stop (look-ahead) Limiter.
• Hard and soft knee, and stereo limiting options available
Divide and distribute up to 20 seconds of
loudspeakers in your setup.
digital delay to compensate for the distance between
Use the full arsenal of dynamics processors to manipulate the dynamic range of the system to
compensate for unwanted noise and signal variations that can detract from overall performance.
Available Dynamics Processors
The Automatic Gain Control (AGC) automatically increases
or decreases gain to compensate for sounds of varying
loudness and maintain consistent volume. No matter who’s at
the microphone, the audience hears an even, natural sound.
The Compressor scales the output of a signal to drive
equipment with a narrower dynamic range (amplifier, tape
deck, etc.) or to compensate for an overactive talker
who accidentally gets too close to the microphone.
The Gate mutes a signal when it drops below an
established threshold. So unwanted ambient noise, like
air conditioners and fans, can’t be heard during pauses in the
program material.
The Downward Expander gradually reduces the gain once the
signal drops below a certain threshold. It’s a more subtle
reduction for situations where gating the signal
completely would be audibly distracting to the audience.
Real-time monitoring
of AGC function.
Unlike other DSP products that constrict your freedom with preset templates, the processing blocks in
the P4800 can be applied in any order, to any input or output. You can also link processors,
including the input and output gains, for more efficient global control. Another time saver lets you copy
and paste processing blocks to any input or output to duplicate processors across multiple channels.
With the P4800, you can design the entire system, save it to disk, and load it at the job site for easy
setup. The P4800 also allows real-time design changes, so you can add, subtract or change processing blocks as you tune the system. It makes setup a breeze. And ensures that you get the best
possible customized audio for your application.
Visual Indicators of Signal and Status.
A variety of visual indicators let you monitor the
performance of the System Processor during (and after)
LED signal metering, aligned in easily identifiable rows
on the front of the box, lets you gauge the signal passing
through the box without hooking up a computer. You also
have full input and output metering on your laptop screen
when the software is in live mode.
Delay and DSP resource meters at the bottom of the
main window help you keep track of available processing power.
DFR and EQ response graphs show you the
effects of DFR and EQ filters on the overall sound system frequency response.
Real World System Design.
So now you know the theoretical possibilities. But how does it work in the real world? That’s what
separates the P4800 System Processor from other multi-channel DSP devices. It’s designed
for the real world.
Last minute hardware changes, unexpected architectural revisions…
With the P4800, you can add or remove processing blocks whenever the need arises. You can
readjust on the fly when the building specifications aren’t what you expected. And you can
hear all of your changes in real time, so you don’t have to wait for the software to compile.
The P4800 System Processor allows control via RS232 and RS422 and interfaces with AMX/Panja and
Crestron control systems. It also supports simple controls like switches and potentiometers, and
provides contact closures to operate other devices, such as lighting or AV equipment.
Hotel Meeting Room Diagram (with moveable airwalls)
Real World Installations.
Room B
Room A
Installed in a house of worship, the P4800 can be configured for
audiences of different sizes and to compensate for different talkers. It’s
just that smart.
In a multi-purpose meeting facility, the P4800 can alternate
presets according to how the airwalls are setup, for one large space
or three smaller spaces, for conferences or concerts. It’s just that
In theatres, the P4800 can be tuned for specific performances and
presentations, even individual singers. It’s just that flexible.
Want to Know More?
Interested in finding out how you can incorporate the P4800 System
Processor in your next system? Visit www.shure.com or call your local
Shure representative for a hands-on demonstration.
System Processor
What it Does.
Quick and Easy Matrix Mixing.
The P4800 System Processor is a four-input, eight-output
DSP tool that provides all necessary functions
between the mixers and amplifiers in an installed
sound system.
The amazingly straightforward matrix mixing function allows
you to quickly assign any of the four inputs to any of the
eight outputs.
Though it’s flexible enough to fit in almost any application,
the P4800 is specifically designed to provide efficient,
reliable back-end signal processing in small to medium-
sized installations.
The convenient pop-up window lets you adjust the
polarity and signal level of your inputs as they’re
routed to the selected output channels. Just a few clicks of
the mouse connects the entire front and back ends of your
audio system.
Combine the System Processor with any of Shure’s AMS or
SCM Mixers for seamless audio performance.
System Processor Features:
• 4X8 Matrix Routing
• Drag and Drop Graphical User Interface
• Full Complement of Processing Blocks,
Including Shure’s Patented DFR Feedback
Reduction Algorithm
• Flexible Signal Path
• Real-Time System Configuration
• On-Screen Metering of Available
Processing Power
• Power Supply Capable of Handling Unexpected
Power Anomalies
Continuous Improvement.
Performance Space Diagram
Backstage Monitor
Backstage Monitor
Since its introduction, the P4800 has been updated
to make it an even more essential DSP tool.
Right Hi
Center Lo
Center Hi
Left Lo
Left Hi
Right Lo
New features include:
• More DSP resources for creating complex
system configurations
• Two New Audio Processors:
Ducker - For sound systems that require public
address or paging
Peak Stop Limiter - a "look-ahead" limiter for
absolute speaker protection and more control over
transient sounds
System Processor
Delay Fills
• Ability to import and view data from SIA-Smaart® and
TEF™ measurements in the P4800's equalizer window
Delay Fills
• Smoother response to real-time changes (both with
control inputs and in Live Mode)
• Windows XP compatible; improved ultra-reliable
operation under all Windows systems
Soundplex TM
Digital Signal Processing
Front Panel
System Processor
Back Panel
Hardware Specifications
Frequency Response
20Hz to 20kHz +1, -3 dB
Analog Audio Inputs
4 analog inputs, block connectors
Operating level defaults to +4dBu,
software switchable to -10dBV
24-bit, 48 kHz AD conversion
+26 dBu input clipping level @ 1% THD
Dynamic Range
100 dB minimum, A-weighted, 20Hz to 20kHz
Sampling Rate
Analog Audio Outputs
8 analog outputs, block connectors
Operating level defaults to +4dBu,
software switchable to -10dBV
24-bit, 48 kHz DA conversion
+22 dBu output clipping level @ 1% THD
Digital-to-Analog, Analog-to-Digital Conversion
24 bit resolution
Propagation Delay from Input to Output
Processing blocks add no additional latency
(except for delay blocks)
Control Pins
Voltage supply: 5Vdc, 100mA (total)
Logic output current sinking ability: 500mA
Input: 10 kΩ
Output: 120 Ω
Operating Voltage
100–240 Vac, 50/60 Hz (auto-switching)
Input Clipping Level
+26 dBu minimum
44mm H x 483mm W x 279mm D
(1 3/4 x 19 x 11 inches)
Output Clipping Level
+22 dBu minimum
+2 dBu minimum with 20 dB pad engaged
4.1 kg (9.0 lbs)
Total Harmonic Distortion (THD)
<0.05% at 1 kHz, +4 dBu, 20 Hz to 20 kHz
Software Specifications
Matrix Mixer
Crossovers & Splitters
Assigns any input to any output
Independently adjustable gain
Selectable muting and polarity for each channel
EQ & Shelving
2 to 5 way crossovers
Butterworth, Bessel, & Linkwitz-Riley up
to 24 dB/octave
Independently adjustable, +/-12 dB gain
Selectable polarity and muting per output
Graphic Equalizers
10 and 30 band. Combining and Non-combining.
Up to 12dB boost, 18dB cut
2 to 5 way splitters
Parametric Equalizers
Available in 3, 5, 7, & 10 filters
Bandwidth: 1/70 to 4 octave filters
Up to 18 dB cut and boost
Dynamics Processing
Cut/Shelf Equalizer
High/Low shelf filters: 6, 12dB/octave slopes, 18dB boost/cut
High/Low cut filters: 6, 12, 18, 24dB/octave slopes
Cut filter types: Butterworth, Bessel, and Linkwitz-Riley
Automatic Feedback Reduction
5 and 10 filter modules available
Frequency resolution: 0.1 Hz
Filter width: 1/10 to 1/40 octave
Filter depths: 3, 6, 9, 12 and 18dB
Up to 2 seconds per delay block
20 seconds total of available delay memory
20 microsecond resolution
Versions Available: Soft/Hard Knee, Stereo
& Peak Stop (look ahead) Limiter
Threshold range: 80dB
Attack: 1 ms to 200 ms, 0 ms to 200 ms
for Peak Stop Limiter
Decay: 50 ms to 1000 ms
Ratio: inf. to 1:1
Gate and Downward Expander
Threshold: 80dB, 0.5 dB resolution
Attack: 1.0 to 200 ms
Decay: 0.05 to 1 second
Gate Hold Time: 0 to 500 ms
AGC Leveler
Threshold: -72 to -1dBu, 0.5dB resolution
Attack: 0.2 to 3 seconds
Decay: 0.5 to 5 seconds
Hinge: Threshold to -1dBu, 0.5dB resolution
Shure Incorporated
222 Hartrey Avenue
Evanston, IL 60202-3696, U.S.A.
Europe GmbH
Wannenäcker Str. 28
74078 Heilbronn, Germany
Phone: 847-866-2200
Fax: 847-866-2279
Phone: 49-7131-72140
Fax: 49-7131-721414
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Causeway Bay, Hong Kong
Phone: 847-866-2200
Fax: 847-866-2585
Phone: 852-2893-4290
Fax: 852-2893-4055
AL1462A Printed in U.S.A. 15K 4/02 ©2002 Shure Incorporated