Page 1
AVIS:
NE PAS OUVRIR
Il ne se trouve a l’interieur aucune piece pourvant entre reparée l’usager.
SEE OWNERS MANUAL. VOIR CAHIER D’INSTRUCTIONS.
S’adresser a un reparateur compétent.
RISQUE DE CHOC ELECTRIQUE
No user serviceable parts inside. Refer servicing to qualified service personnel.
CAUTION
WARNING:
TO REDUCE THE RISK OF FIRE OR
ELECTRIC SHOCK DO NOT EXPOSE
THIS EQUIPMENT TO RAIN OR MOISTURE
DO NOT OPEN
RISK OF ELECTRIC SHOCK
Quick Start Guide
To download the full 528E User Guide, go to the
528E Voice Processor
Before You Begin 1
528E product page on www.symetrixaudio.com.
What Ships in the Box
The 528E hardware unit
An IEC power cable
This Quick Start Guide
Getting Help
You can download the complete
528E User’s Guide from
www.symetrixaudio.com.
If you have questions beyond the
scope of the help guide, contact
Symetrix Customer Service in one of
the following ways:
Phone (425) 778-7728
8:00 am to 4:30 pm
Monday through Friday,
Pacific Time
Email tech@symetrixaudio.com
Web www.symetrixaudio.com
Notational Conventions in this
Quick Start Guide
NOTE Identifies information that
needs extra emphasis. Generally
supplies extra information to help you
to better use the 528E
CAUTION Identifies information that,
if ignored, may cause damage to the
528E unit or other equipment in your
system.
WARNING Identifies information that,
if ignored, may be hazardous to your
health or that of others.
CAPS Controls, switches or other
markings on the chassis of the 528E.
The lightning flash with arrowhead
symbol within an equilateral triangle is
intended to alert the user of the presence of uninsulated “dangerous voltage”
within the product’s enclosure that may
be of sufficient magnitude to constitute
a risk of electric shock to persons. The
exclamation point within an equilateral
triangle is intended to alert the user of
the presence of important operating and
maintenance (servicing) instructions in
the literature accompanying the product
(i.e. this quick start guide).
CAUTION To prevent electric shock,
do not use the polarized plug supplied
with the unit with any extension cord,
receptacle, or other outlet unless the
prongs can be fully inserted.
Important Safety Instructions.
Please read and keep these instructions. Heed and follow all warnings and
instructions. Install in accordance with
the manufacturer’s instructions.
Power Source. This product is
intended to operate from a power source
that does not apply more than 250V
RMS between the power supply conductors or between either power supply conductor and ground. A protective ground
connection, by way of the grounding
conductor in the power cord, is essential
for safe operation.
Grounding. The chassis of this
product is grounded through the grounding conductor of the power cord. To
avoid electric shock, plug the power cord
into a properly wired receptacle before
making any connections to the product.
A protective ground connection, by way
of the grounding conductor in the power
cord, is essential for safe operation. Do
not defeat the safety purpose of the
grounding plug. The grounding plug
has two blades and a third grounding
prong. The third prong is provided for
your safety. When the provided plug
does not fit your outlet, consult an elec
trician for replacement of the obsolete
outlet.
Danger from Loss of Ground.
If the protective ground connection is
lost, all accessible conductive parts,
including knobs and controls that may
appear to be insulated, can render an
electric shock.
Proper Power Cord. Use only
the power cord and connector specified for the product and your operating
locale. Use only a cord that is in good
condition. Protect the power cord from
being walked on or pinched, particularly
at the plug, convenience receptacle, and
the point where the cord exits from the
apparatus.
Phantom Power. To prevent
hazard or damage, ensure that only
microphone cables and microphones
designed to IEC-268-15A are connected.
Proper Fuse. The user accessible
fuse is a part of the IEC AC inlet connec
tor. The fuseholder accepts 5 x 20 mm
diameter fuses. For 117 VAC opera
tion, the correct value is 0.25 A, 250
VAC, standard. For 230 VAC operation,
the correct value is 0.125A, 250 VAC,
standard.
Operating Location. Do not
operate this equipment under any of
the following conditions: explosive
atmospheres, in wet locations, in inclement weather, improper or unknown AC
mains voltage, or if improperly fused. Do
not install near any heat source such as
radiators, heat registers, stoves, or other
apparatus (including amplifiers) that pro
duce heat. Unplug this apparatus during
lightning storms or when unused for long
periods of time.
Stay Out of the Box. To avoid
personal injury (or worse), do not remove
the product covers or panels. Do not
operate the product without the covers
and panels properly installed. Only use
accessories specified by the manufac
-
turer. Clean only with a dry cloth.
User Serviceable Parts. There
are no user serviceable parts inside
the 528E. In case of failure, customers
inside the U.S. should refer all servicing to the factory. Customers outside
the U.S. should contact their distributor.
Distributor contact information is available online at www.symetrixaudio.com.
Servicing is required when the 528E
has been damaged in any way, such
as when a power supply cord or plug
is damaged, liquid has been spilled or
objects have fallen into the apparatus,
the apparatus has been exposed to rain
or moisture, does not operate normally,
or has been dropped.
-
Page 2
Quick Start Guide
-15
-30
DE-ESS (-dB)
20
800
60
8K
15
CLIP
3K
0
BYPASS
DE-ESS
-40
0 +20
1
10 16
EXP/COMP
.3500
4
9246912
-15
1220 16
-25
-10
36
2
160 1.5
EQ
+15
6.3K
+15 160
.3
-15
4
680
22K
.3
4
-15 +15
0
2.5K
1.5
0
6.8K
1.5
0
+15 -15
-3 -6 -10 -20 -15
0
CLIP30
MIC PRE-AMP
MIC GAIN(dB)
MIC
LINE
PHANTOM
IN
OUT
FREQUENCY THRESHOLD
DOWNWARD EXPANDER (-dB)
OUT
IN
EXP THRES COMP THRES COMP RATIO
HIGH EQLOW EQ
FREQUENCY BANDWIDTH CUT/BOOST FREQUENCY BANDWIDTH CUT/BOOST FREQUENCY BANDWIDTH CUT/BOOST
IN
OUT
GAIN (dB)
OUTPUT LEVEL (VU)
OUT
IN
SYMMETRY
VOIC
E
MID EQ
20 61216 9 3
CO
MPRESSOR (-dB)
POWER
dBHz OCT Hz OCT dB Hz OCT dB
-15 PAD
NORM
528E
VOICE
PROCESSOR
-15
-30
DE-ESS (-dB)
8K
15
3K
0
BYPASS
DE-ESS
-40
0 +20
1
10 16
EXP/COMP
.3500
4
9246912
-15
1220 16
-25
-10
36
2
160 1.5
EQ
+15
6.3K
+15 160
.3
-15
4
680
22K
.3
4
-15 +15
0
2.5K
1.5
0
6.8K
1.5
0
+15 -15
-3 -6 -10 -20 -15
0
CLIP30
IN
OUT
DOWNWARD EXPANDER (-dB)
OUT
IN
EXP THRES COMP THRES COMP RATIO
HIGH EQLOW EQ
FREQUENCY BANDWIDTH CUT/BOOST FREQUENCY BANDWIDTH CUT/BOOST FREQUENCY BANDWIDTH CUT/BOOST
IN
OUT
GAIN (dB)
OUTPUT LEVEL (VU)
OUT
IN
SYMMETRY
VOIC
E
MID EQ
20 61216 9 3
CO
MPRESSOR (-dB)
POWER
dBHz OCT Hz OCT dB Hz OCT dB
-15
.3500
4
160 1.5
EQ
+15
6.3K
+15 160
.3
-15
4
680
22K
.3
4
-15 +15
0
2.5K
1.5
0
6.8K
1.5
0
+15 -15
-3 -6 -10 -20 -15
0
CLIP30
HIGH EQLOW EQ
FREQUENCY BANDWIDTH CUT/BOOST FREQUENCY BANDWIDTH CUT/BOOST FREQUENCY BANDWIDTH CUT/BOOST
IN
OUT
GAIN (dB)
OUTPUT LEVEL (VU)
OUT
IN
SYMMETRY
VOIC
E
MID EQ
POWER
dBHz OCT Hz OCT dB Hz OCT dB
EQ
-15 +15
0
+15 -15
-3 -6 -10 -20 -15
0
CLIP30
IN
OUT
GAIN (dB)
OUTPUT LEVEL (VU)
OUT
IN
SYMMETRY
VOIC
E
POWER
To download the full 528E User Guide, go to the
528E Voice Processor
Front Panel 2
Mic Preamp
MIC/LINE Selects between the Mic input (switch in) and Line input (switch out).
-15 PAD Inserts 15 dB pad for strong mic signals.
MIC GAIN(dB) Sets the gain of the mic preamp for best compromise between signal-to-noise ratio and
headroom.
CLIP Monitors inputs (mic and line) for clipping. Illuminates 3 dB below the actual clip point.
PHANTOM Illuminates when 48V phantom power is present at the microphone input connector.
The phantom power switch is located on the rear panel.
De-Esser
FREQUENCY Sets the rolloff (cutoff) frequency of the de-esser.
THRESHOLD Sets the threshold level for the de-esser. Signals above this level cause
de-esser action, signals below do not.
DE-ESS Hard-wire bypasses the de-esser. The de-esser is active when this switch
IN/OUT is in.
LED Display Indicates the amount of de-esser activity at any instant in time.
528E product page on www.symetrixaudio.com.
Downward Expander / Compressor
EXP THRES Sets the threshold level for the downward expander. Signals
below this threshold are downward expanded (reduced in
level).
EXPANDER Indicates the amount of de-esser activity at any instant in
LED Display time.
COMP THRES Sets the threshold level for the compressor. Signals above
this threshold cause gain reduction in the compressor.
COMP RATIO Sets the compression ratio of the compressor.
EXP/COMP Defeats the downward expander / compressor. This is not a hard-wire bypass.
IN/OUT
COMPRESSOR Indicates the amount of compressor activity (gain reduction) at any given instant in time.
LED Display
Parametric EQ Low
FREQUENCY Varies the center frequency of the low-frequency equalizer from
16 Hz to 500 Hz.
BANDWIDTH Varies the bandwidth of the low-frequency equalizer from 0.3 to 4
octaves. (Q = 0.27 to 4.8).
CUT/BOOST Set the degree of boost or cut +/- 15 dB.
Page 3
Quick Start Guide
EQUALIZER
INPUT
15 WATTS MAXIMUM
R F REZ TOUTE R PARATION ½ UN TECHNICIEN QUALIFI .
FABRIQU AUX E.-U. PAR SYMETRIX INC., LYNNWOOD,
WASHINGTON.
MANUFACTURED IN THE USA BY
BALANCED OUTPUT
POWER
THIS UNIT CONTAINS NO
USER SER
VICEABLE PARTS.
OUTPUT STAGE
INPUTOUTPUT
UNBALANCED
OUTPUT
LINE INPUT
OUTPUT
RING=SEND
SIDECHAIN
EXPANDER/COMPRESSOR
TIP=RETURN
OUTPUT INPUT
PRE-AMP
STAG
E
OUTPUTINPUT
DE-ESS
MIC INPUT
BYPASS
PHANTOM
POWE
R
+48V
To download the full 528E User Guide, go to the
528E Voice Processor
Front Panel (cont.) 3
Parametric EQ Mid
FREQUENCY Varies the center frequency of the low-frequency equalizer from
160 Hz to 6.3k Hz.
BANDWIDTH Varies the bandwidth of the low-frequency equalizer from 0.3 to 4
octaves. (Q = 0.27 to 4.8).
CUT/BOOST Set the degree of boost or cut +/- 15 dB.
Parametric EQ High
FREQUENCY Varies the center frequency of the low-frequency equalizer
from 680 Hz to 22 kHz.
BANDWIDTH Varies the bandwidth of the low-frequency equalizer from
0.3 to 4 octaves. (Q = 0.27 to 4.8).
CUT/BOOST Set the degree of boost or cut +/- 15 dB.
EQ IN/OUT Hard-wire bypasses the entire equalizer.
528E product page on www.symetrixaudio.com.
Output Section
GAIN Sets the overall gain of the 528E’s output over a +/- 15 dB range.
NOTE: The actual adjustment point is in the expander/compressor’s VCA, which is
pre-EQ.
VOICE Inserts speech waveform asymmetry correction into the signal path.
SYMMETRY
OUTPUT LED Indicates the peak output level of the 528E relative to the balanced output.
The 0 VU LED on the display corresponds to +4 dBu at the balanced output.
For unbalanced applications, the actual output level is 6 dB lower than that
shown by the display.
NOTE: If the internal mic-level output switch has been depressed, the output level is -40 dBu when the display
indicates 0 VU.
POWER LED Indicates the presence of AC power.
Rear Panel
Power
AC INPUT IEC power connector. Connect
only to appropriate AC power
source. Refer to rear panel
marking for correct AC source
voltage.
POWER Turns the 528E on and off.
SWITCH
SERIAL Please note the serial number
NUMBER for future reference. Should your 528E ever require service, Symetrix Customer Service will need this
information in order to process your repair request.
Page 4
Quick Start Guide
LINE INPUT
OUTPUT
RING=SEND
SIDECHAIN
EXPANDER/COMPRESSOR
TIP=RETURN
PRE-AMP
STAGE
OUTPUTINPUT
DE-ESS
MIC INPUT
BYPASS
PHANTOM
POWE
R
+48V
MIC INPUT
BYPASS
PHANTOM
POWER
+48V
To download the full 528E User Guide, go to the
528E Voice Processor
Rear Panel (cont.) 4
Output Stage I/O
BALANCED XLR male connector. Balanced, line level output. This output may
OUTPUT be converted to a mic level output. See
on page 10.
UNBALANCED TRS phone jack (wired for unbalanced operation). Provides a line
OUTPUT level unbalanced output. This jack is unaffected by the Mic Level
Output Configuration switch mentioned above.
OUTPUT TRS phone jack (wired for unbalanced operation). This is the
STAGE INPUT input to the output stage. Inserting a connector into this jack will
interrupt any signal coming from previous (upstream) modules of
the 528E.
Equalizer I/O
OUTPUT TRS phone jack (wired unbalanced). This is the output of the equalizer. Inserting a
connector into this jack does not interrupt signal flow to the 528E’s output stage.
INPUT TRS phone jack (wired unbalanced). This is the input to the equalizer. Inserting a
connector into this jack interrupts signal flow from the Expander / Compressor.
Output Level Switch
528E product page on www.symetrixaudio.com.
Expander / Compressor I/O
OUTPUT TRS phone jack (wired unbalanced). This is the output of the expander /
compressor. Inserting a connector into this jack does not interrupt signal
flow to the equalizer.
SIDECHAIN TRS phone jack wired as an insert jack. (Tip = return, Ring = Send). Use
this jack trigger or “key” the compressor / expander from an external
source.
INPUT TRS phone jack (wired unbalanced). This is the input to the expander /
compressor. Inserting a connector into this jack interrupts signal flow from
the de-esser.
De-esser I/O
OUTPUT TRS phone jack (wired unbalanced). This is the output of the de-esser. Inserting a
connector into this jack does not interrupt signal flow to the 528E’s expander /
compressor.
INPUT TRS phone jack (wired unbalanced). This is the input to the expander / compressor.
Inserting a connector into this jack interrupts signal flow from the mic / line inputs.
Page 5
Quick Start Guide
To download the full 528E User Guide, go to the
528E Voice Processor
Rear Panel (cont.) 5
Preamp Stage I/O
PREAMP STAGE TRS phone jack (wired unbalanced). This is the
OUTPUT output of the mic / line preamp. Inserting a
connector into this jack will not interrupt signal flow
to the 528E’s de-esser.
LINE INPUT XLR female connector providing a 10k Ohm
balanced bridging line input intended for signals
ranging from -10 dBu to +4 dBu.
MIC INPUT XLR female connector providing a balanced input
suitable for low impedance microphones. 48V phantom powering is available at this connector.
PHANTOM Pushbutton switch enabling 48V phantom power on the MIC INPUT.
POWER
Quick Setup
Now that you’re familiar with the controls, you can use this section to get signal running through the 528E quickly.
Connections
Connect a Mic or Line level source to the appropriate input connector on the rear of the 528E. Be sure to set the Mic / Line
switch to the appropriate position and be sure to turn on phantom power if using a microphone that requires it. Next, connect the
appropriate output of the 528E to your monitoring system or mixing console. Finally, connect the 528E to an AC source of the
proper voltage and frequency as marked on the rear of the unit.
528E product page on www.symetrixaudio.com.
Settings
Set the controls and switches on the front of the 528E per the following table:
Front Panel Control Setting Front Panel Control Setting
MIC / LINE As required LOW EQ FREQUENCY 160 Hz (12 o’clock)
-15 PAD
MIC GAIN 12 o’clock LOW EQ CUT/BOOST 0 (12 o’clock)
DE-ESS FREQUENCY 3K (12 o’clock) MID EQ FREQUENCY 2.5K (12 o’clock)
DE-ESS THRESHOLD
DE-ESS IN / OUT Out MID EQ CUT/BOOST 0 (12 o’clock)
DOWNWARD EXPANDER EXP THRES BYPASS (Full CCW)
COMPRESSOR COMP THRES
COMPRESSOR COMP RATIO
EXP/COMP IN / OUT
VOICE SYMMETRY IN / OUT
You can now power on the 528E and it should pass signal. The OUTPUT LEVEL LED display should show some activity and the
POWER LED should be illuminated. We can now move on to fine tuning your settings.
Out LOW EQ BANDWIDTH 1.5 octaves (12 o’clock)
0 (Full CW) MID EQ BANDWIDTH 1.5 octaves (12 o’clock)
HIGH EQ FREQUENCY 6.8K (12 o’clock)
+20 (Full CW) HIGH EQ BANDWIDTH 1.5 octaves (12 o’clock)
2 (12 o’clock) HIGH EQ CUT/BOOST 0 (12 o’clock)
Out EQ IN / OUT Out
Out GAIN 0 (12 o’clock)
Page 6
Quick Start Guide
To download the full 528E User Guide, go to the
528E Voice Processor
Refining Your Settings 6
Mic Preamp Gain Settings
Set the MIC GAIN control so that the OUTPUT LEVEL LED display indicates a signal between -10 and 0 VU. The CLIP LED
should almost never light. If it does, decrease the MIC GAIN control until it does not. Any loss in gain can be made up for later in
the signal chain.
De-Esser Settings
The De-Esser is used to reduce the level of objectionable sibilant sounds (S and T sounds). Engage the De-Esser by pressing
the DE-ESS IN / OUT button IN. Set the THRESHOLD control so that the de-esser gain reduction LED display shows about 12
dB of reduction. Now, “tune” the FREQUENCY control for the maximum sibilance reduction. Finally, reduce the setting of the
THRESHOLD control until you reduce the sibilance to a tolerable level without harming the quality of the audio signal.
Downward Expander Settings
Use the Expander to reduce room noise or other low level or background noise. Set the THRESHOLD control to allow low level
speech sounds to pass while still blocking out room sound or noise.
Compressor Settings
Use the COMP THRES control to determine the level at which the compressor starts to work. As the sound level increases
above the set threshold, you will see the gain reduction LED display start to work indicating the amount of gain reduction taking
place. Generally 3 to 6 dB is sufficient, unless you are using a low compression ratio (below 2:1), or you want a special effect.
Pick a ratio suited to the task at hand: low ratios and low thresholds for unobtrusive level control, medium ratios for overall level
control and consistency, high ratios (greater than 8:1) for limiting or in-your-face sorts of sounds.
528E product page on www.symetrixaudio.com.
Equalizer Settings
Equalization is entirely dependent upon many factors and should generally be used to correct or enhance the frequency content
of the signal. For example, the default settings should be close for the male voice. For female voices, the LOW EQ range shifts
up to 200 or 300 Hz and the MID EQ range shifts up to 3-5 kHz.
If you are using a microphone that exhibits proximity effect, then you’ll probably need to reduce (cut) the bass (LOW EQ)
response somewhat. 3-6 dB should be fine, but you’ll have to compromise between a big full sound and the overbearing low
frequency content. A bit of MID EQ will help make voices cut through and seem louder. The HIGH EQ can add brightness and
intimacy.
It will take some tuning and experimentation based on the signal source, microphone used and personal taste.
Output Settings
For many applications, setting the output GAIN control to 0 dB works fine. If you are adding a lot of EQ, this will tend to cause
an overall level increase. Thus, you may need to lower the output GAIN appropriately. Likewise, if you are using a fair amount
of compression, you may need to add some gain to compensate for the gain reduction in the compressor section. You should
adjust the output GAIN control so that it provides enough signal level to your connections downstream, yet still prevents the
CLIP LED from illuminating.
The output CLIP LED monitors both the equalizer and the output stage. Large amounts of EQ boost and/or high signal levels
can cause CLIP indications. If this occurs, lower the signal level via the GAIN control. It is also possible for the output stage
to clip if a processor, inserted via the OUTPUT STAGE INPUT jack, is contributing gain to the overall signal path. In this case,
either lower the gain of the inserted processor or reduce the setting of the output GAIN control.
Page 7
Quick Start Guide
INPUT SELECT
SWITCH IN
`MIC' POSITION
FRONTPANEL
THIS UNIT CONTAINS NO
USER SERVICEABLE PARTS.
MANUF
ACTURED IN THE USA BY
POWER
EXPANDER/COMPRESSOR
OUTPUT
OUTPUT STAGE
INPUT
UNBALANCED
OUTPUT
BALANCED OUTPUT
OUTPUT
INPUT
EQUALIZER DE-ESS
INPUT
TIP=RETURN
RING=SEND
SIDECHAIN
OUTPUT
INPUT
STAGE
OUTPUT
PRE-AMP
LINE INPU
T
PHANTOM
POWER
+48V
BYPASS
MIC INPUT
RP SE S
S SEPR
FROM CHANNEL
PA
TCH SEND OUTPUT
TO CHANNEL PATC
H
RETURN INPUT
INPUT SELECT
(OUT) POSITION
SWITCH IN `LINE'
FRONTPANEL
THIS UNIT CONTAINS NO
USER SERVICEABLE PARTS.
MANUF
ACTURED IN THE USA BY
POWER
EXPANDER/COMPRESSOR
OUTPUT
OUTPUT STAGE
INPUT
UNBALANCED
OUTPUT
BALANCED OUTPUT
OUTPUT
INPUT
EQUALIZER DE-ESS
INPUT
TIP=RETURN
RING=SEND
SIDECHAIN
OUTPUT
INPUT
STAGE
OUTPUT
PRE-AMP
LINE INPUT
PHANTOM
POWER
+48V
BYPASS
MIC INPUT
RP SE S
S SEPR
To download the full 528E User Guide, go to the
528E Voice Processor
Typical Setups 7
Stand-alone operation
A vast majority of users use the 528E as a stand-alone device. Here the 528E replaces their usual microphone preamp and
either feeds their tape machine or workstation directly, in essence becoming a one-input, one-output console.
As A Channel Insert Device
In this situation, you are using the 528E as a line signal processor, utilizing the 528E’s de-esser, expander/compressor and
equalizer while using your console’s input and output stages.
528E product page on www.symetrixaudio.com.
Page 8
Quick Start Guide
LIN
EQUALIZER
INPUT
OUTPUT STAGE
OUTPUT
UNBALANCED
OUTPUT
EXPANDER/COMPRESSOR
INPUT OUTPUT
RING=SEND
TIP=RETURN
SIDECHAIN
INPUT INPUTOUTPUT
DE-ESS PRE-AMP
OUTPUT
STAGE
OUTPUT INPUT
EXTERNAL AUDIO PROCESSOR
LIN
EQUALIZER
INPUT
OUTPUT STAGE
OUTPUT
UNBALANCED
OUTPUT
EXPANDER/COMPRESSOR
INPUT OUTPUT
RING=SEND
TIP=RETURN
SIDECHAIN
INPUT INPUTOUTPUT
DE-ESS PRE-AMP
OUTPUT
STAGE
LIN
EQUALIZER
INPUT
OUTPUT STAGE
OUTPUT
UNBALANCED
OUTPUT
EXPANDER/COMPRESSOR
INPUT OUTPUT
RING=SEND
TIP=RETURN
SIDECHAIN
INPUT INPUTOUTPUT
DE-ESS PRE-AMP
OUTPUT
STAGE
NOTE: SPECIAL
WIRING NEEDED
TO TIP
TO
RING
INPUT
OUTPUT
To download the full 528E User Guide, go to the
528E Voice Processor
Using The Patch Points 8
Inserting Additional Processing
This illustration shows an external processor inserted between
the 528E’s equalizer and its output stage. To insert additional
(external) processing into the 528E’s signal path:
1. Decide where in the 528E’s signal path you wish to insert the
external processor.
2. Patch the appropriate output jack on the 528E to the input jack of the
external processor. Use either a TRS or TS patchcord.
3. Patch the output jack of the external processor to the corresponding
input jack on the 528E. Use either a TRS or TS patchcord.
Changing The Sequence Of Processing
You may wish to change the sequence of processing within
the 528E to allow the signal processors to work on the input
signal in a particular way (your way). A good example of this
is the compressor: should the equalizer precede or follow
the compressor. Most studio engineers would have the
equalizer follow the compressor, like it normally does in the
528E. In broadcast, many engineers prefer the opposite; the
compressor receives the output of the equalizer.
528E product page on www.symetrixaudio.com.
Using The Equalizer In The Sidechain
For some applications, you may want the 528E’s equalizer in
its sidechain rather than in the signal path. Doing so makes
both the compression and downward expansion frequency
conscious.
Page 9
Quick Start Guide
To download the full 528E User Guide, go to the
528E Voice Processor
Other Notes Of Interest 9
Signal Levels
The 528E is designed around studio/professional line levels: +4 dBu or 1.23 volts. The unit is quiet enough to operate at lower
signal levels such as those found in semi-pro or musical-instrument (MI) equipment (-10 dBu or 300 millivolts).
The microphone input is designed to accept low-impedance microphones. Switchable 48V phantom powering is provided for
suitable condenser microphones. The microphone input accepts signal levels from -60 to -5 dBV (+10 dBV with the -15 dB pad).
The line input is designed to accept nominal line level: +4 dBu.
The output line driver delivers +4 dBm into 600 Ohm or higher balanced loads. An internal switch converts the line level output
to microphone level, or -36 dBu. An unbalanced output is also available via a 1/4” TRS phone jack. This jack is always line-level
and is unaffected by the internal switch.
When using the 528E with HAM radio equipment, it may be necessary to build an “L” pad attenuator in order to level match the
528E’s unbalanced 1/4” TRS output to a HAM radio transceiver’s unbalanced input. The 528E has a level of -2 dBu (-10 dBV)
at it’s unbalanced output which translates to 0.615 volts RMS. The typical HAM radio transceiver has an input impedance of 10k
Ohms so it would be expecting a level of 0.100 volts RMS. Knowing this, one can build an “L” pad attenuator with a 3600 Ohm
series resistor followed by an 820 Ohm resistor to ground. This will give approximately 15.58 dB of attenuation thus providing a
suitable level to the HAM radio transceiver input.
I/O Impedances
The 528E is designed to interface into almost any recording studio or sound reinforcement application.
This includes:
• 600 Ohm systems where input and output impedances are matched.
• Unbalanced semi-professional equipment applications.
• Modern bridging systems where inputs bridge and outputs are low source impedances (voltage transmission systems).
The 528E’s microphone input is intended to bridge a 150 Ohm balanced source. The actual input impedance is approximately 8k
Ohms. 48V phantom powering for condenser microphones is present if the PHANTOM POWER switch has been depressed.
The 528E’s line input impedance is 10k Ohms balanced, and 10k Ohms unbalanced. The inputs may be driven from any source
(balanced or unbalanced) capable of delivering at least -10 dBu into the aforementioned impedances.
The 528E’s output impedance is 200 Ohms balanced, 100 Ohms unbalanced. The output line driver delivers +18 dBm into a 600
Ohm balanced load or +18 dBm into 600 Ohm unbalanced loads.
528E product page on www.symetrixaudio.com.
I/O Impedances
The 528E uses the international standard polarity convention of pin 2 hot. Therefore:
XLR Tip-Ring-Sleeve Signal
1 Sleeve Ground
2 Tip High
3 Ring Low
If your system uses balanced inputs and outputs, and uses the 528E this way, then the polarity convention is unimportant. If your
system is both balanced and unbalanced, then you must pay attention to this, especially when going in and coming out through
different connector types (like input on an XLR, output on a phone jack).
Further Information
Much more information including an online tutorial, customer submitted settings, frequently asked questions and trouble shooting information as well as the complete user’s guide can be found on the Symetrix web site at (http://www.symetrixaudio.com).
Page 10
Quick Start Guide
To download the full 528E User Guide, go to the
528E Voice Processor
Output Level Switch 10
WARNING Lethal voltages are present inside the chassis. Perform all service work with the unit
disconnected from all AC power.
CAUTION These servicing instructions are for use by qualified personnel only. To avoid electric shock, do not
perform any servicing other than that contained in the operating instructions portion of this manual unless
you are qualified to do so. Refer all servicing to qualified service personnel.
Tools Required
1. #2 Phillips-head screwdriver
Top Cover Removal
1. Ensure that the 528E is disconnected from the AC power source.
2. Remove two 6-32 x 1/2 inch screws from the top panel and two 6-32 x 1/2 inch screws from each side of the chassis.
3. Lift the top cover free of the chassis.
Changing The XLR Output Level
The 528E ships from Symetrix with the XLR output configured for a line level output. If you must have a microphone level output,
the following steps lead you through the process of switching the XLR line level output to microphone level (or back to line level).
1. Remove the top cover according to the steps outlined above.
2. As you look at the unit with the front panel facing you, locate the OUTPUT LEVEL switch (SW7) in the upper right side of
the unit just below the XLR output connector. SW7 is in red in the diagram below.
3. Push the switch in to select MIC level output or out to select LINE level output.
4. Replace the top cover.
5. Reinstall the 528E into your setup.
528E product page on www.symetrixaudio.com.
Page 11
Quick Start Guide
To download the full 528E User Guide, go to the
528E Voice Processor
Specifications 11
528E product page on www.symetrixaudio.com.
Inputs
Controls and Switches Mic Gain, Phantom Power, Mic/Line
Mic and Line Input Connectors XLR-female (2)
Clip LED Lights at +17 dBu output level
from mic preamp or line input amplifier
Microphone Input Type Balanced Transformerless,
Low Impedance
Phantom Power (DIN 45 596) +48V, nominal
Microphone Preamp Gain 22 to 60 dB (pad out)
7 to 45 dB (pad in)
Microphone Input Maximum Input Level -3 dBu (pad out)
Equivalent Input Noise (EIN) -126 dBV (150-0 Ohm source,
20 Hz to 20 kHz)
THD + Noise (Preamp only) 0.05% (2 kHz, 50 dB gain,
+17 dBu output)
Mic Preamp CMRR > 60 dB (40 dB gain, 20 Hz to 20 kHz)
Line Input Type and Impedance 10k Ohm Transformerless
Balanced Bridging
Line Input Maximum Input Level +24 dBu
Line Input Nominal Input Level +4 dBu
Line Input CMRR > 50 dB (0 dBu, 20 Hz to 20 kHz)
Parametric Equalizer
Type Three-band Parametric Equalizer
Bands Low: 16 to 500 Hz, Mid: 160 to 6300 Hz
High: 680 Hz to 22 kHz
Peak/Dip Bandwidth 0.3 to 4 octaves, measured at
maximum boost
Maximum Boost/Cut +/- 15 dB
Overall Performance Data
Frequency Response 20 Hz to 20 kHz (+0, -0.5 dB), EQ cut
compressor out, downward
expander out, de-esser out
THD + Noise 0.05%, 20 Hz to 20 kHz, +4 dBm output
Noise Floor Better than -89 dBu, 20 Hz to 20 kHz
Dynamic Range Processor
Type Interactive Comp/Limiter-Downward Expander
Comp/Limiter Ratio 1:1 to 10:1
Downward Expansion Ratio (max) 1:1.8
De-esser Type Program controlled high-cut filter, 12 dB/octave
Frequency Range 800 Hz to 8000 Hz
Threshold -30 to 0 dBu
Output Section Type Balanced, Transformerless
Maximum Output Level +24 dBm Balanced, +18 dBm Unbalanced
Connector XLR-male
Output Clip LED Lights 3 dB below clipping
Output Source Impedance 200 Ohms, Balanced
Minimum Load Impedance 600 Ohms Balanced or Unbalanced
Voice Symmetry Switch Improves modulation symmetry
of speech signals
Output Gain +/- 15 dB
Physical
Size (hwd) 1.72 x 19 x 7.25 inches,
4.37 x 48.26 x 18.415 centimeters
Weight 7.6 lbs (3.5 kg) net, 10 lbs (4.6 kg) shipping
Metering
Type Multi-segment LED bar graph
Output Level -20 to +3 VU (0 VU = +4 dBu), VU calibrated,
Gain Reduction Separate displays for:
de-esser, downward expander,
peak responding
and compressor
0 to 20 dB per display
Electrical
Power Requirements 117V nominal, 105 to 125V AC,
50 to 60 Hz, 15 watts maximum
230V nominal, 205 to 253V AC, 50 Hz 15 watts maximum
Note: The maximum operating ambient temperature is 25 degrees C.
Specifications subject to change without notice.
Page 12
Quick Start Guide
To download the full 528E User Guide, go to the
528E Voice Processor
Warranty & Service 12
The Symetrix Limited Warranty
Symetrix, Inc. expressly warrants that the product will be free from defects in material and workmanship for eighteen (18)
months from the date the product is shipped from the factory. Symetrix's obligations under this warranty will be limited to repair
ing or replacing, at Symetrix's option, the part or parts of the product which prove defective in material or workmanship within
eighteen (18) months from the date the product is shipped from the factory, provided that the Buyer gives Symetrix prompt notice
of any defect or failure and satisfactory proof thereof. Products may be returned by Buyer only after a Return Authorization
number (RA) has been obtained from Symetrix. Buyer will prepay all freight charges to return the product to the Symetrix factory.
Symetrix reserves the right to inspect any products which may be the subject of any warranty claim before repair or replacement
is carried out. Symetrix may, at its option, require proof of the original date of purchase (dated copy of original retail dealer's
invoice). Final determination of warranty coverage lies solely with Symetrix. Products repaired under warranty will be returned
freight prepaid via United Parcel Service by Symetrix, to any location within the Continental United States. Outside the Continental United States, products will be returned freight collect.
The foregoing warranties are in lieu of all other warranties, whether oral, written, express, implied or statutory.
Symetrix, Inc. expressly disclaims any IMPLIED warranties, including fitness for a particular purpose or merchantability. Symetrix's warranty obligation and buyer's remedies hereunder are SOLELY and exclusively as
stated herein.
This Symetrix product is designed and manufactured for use in professional and studio audio systems and is not intended for
other usage. With respect to products purchased by consumers for personal, family, or household use,
disclaims all implied warranties, including but not limited to warranties of merchantability and fitness for a particular purpose.
This limited warranty, with all terms, conditions and disclaimers set forth herein, shall extend to the original purchaser and
anyone who purchases the product within the specified warranty period.
Symetrix does not authorize any third party, including any dealer or sales representative, to assume any liability or make any
additional warranties or representation regarding this product information on behalf of Symetrix.
This limited warranty gives the buyer certain rights. You may have additional rights provided by applicable law.
NOTE: Some Symetrix products contain embedded software and may also be accompanied by control software intended to be
run on a personal computer. Said software is specifically excluded from this warranty.
528E product page on www.symetrixaudio.com.
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Symetrix expressly
Limitation of Liability
The total liability of Symetrix on any claim, whether in contract, tort (including negligence) or otherwise arising out of, connected
with, or resulting from the manufacture, sale, delivery, resale, repair, replacement or use of any product will not exceed the price
allocatable to the product or any part thereof which gives rise to the claim. In no event will Symetrix be liable for any incidental or
consequential damages including but not limited to damage for loss of revenue, cost of capital, claims of customers for service
interruptions or failure to supply, and costs and expenses incurred in connection with labor, overhead, transportation, installation
or removal of products, substitute facilities or supply houses.
Servicing the 528E
If you have determined that your 528E requires repair services and you live outside of the United States please contact your
local Symetrix dealer or distributor for instructions on how to obtain service. If you reside in the U.S. then proceed as follows.
Return authorization
At the Symetrix factory, Symetrix will perform in-warranty or out-of-warranty service on any product it has manufactured for a
period of three years from date of manufacture.
Before sending anything to Symetrix, please contact our Customer Service Department for a return authorization (RA) number.
The telephone number is (425) 778-7728. Additionally support is available via E-mail through tech@symetrixaudio.com or via
the web site http://www.symetrixaudio.com.
Page 13
Quick Start Guide
To download the full 528E User Guide, go to the
528E Voice Processor
Warranty & Service (cont.) 13
In-warranty repairs
To get your 528E repaired under the terms of the warranty:
1. Call us for an RA number.
2. Pack the unit in its original packaging materials.
3. Include your name, address, daytime telephone number, and a brief statement of the problem.
4. Write the RA number on the outside of the box.
5. Ship the unit to Symetrix, freight prepaid. We do not accept freight collect shipments.
Just do these five things, and repairs made in-warranty will cost you only one way freight charges. We'll pay the return freight.
If you don't have the factory packaging materials, we recommend using an oversize box. Wrap the unit in a plastic bag, surround
it with bubble-wrap, and place it in the box surrounded by Styrofoam peanuts. Be sure there is enough clearance in the box to
protect the rack ears. We won't return the unit in anything but Symetrix packaging for which we will have to charge you. If the
problem is due to operator misuse or error, you will have to pay for both parts and labor. In any event, if there are charges for the
repair, you will pay for the return freight. All charges will be COD unless you have made other arrangements (prepaid, Visa or
Mastercard).
Out-of-warranty repairs
If the warranty period has passed, you'll be billed for all necessary parts, labor, packaging materials, and freight charges. Please
remember, you must call for an RA number before sending the unit to Symetrix.
528E product page on www.symetrixaudio.com.
© 2002, Symetrix, Inc. All rights reserved. Printed in the United States of America. Symetrix Part Number 53528E1A00. The information in this guide is
subject to change without notice. Symetrix, Inc. shall not be liable for technical or editorial errors or omissions contained herein; nor is it liable for incidental
or consequential damages resulting from the furnishing, performance, or use of this material. Mention of third-party products is for informational purposes
only and constitutes neither an endorsement nor a recommendation. Symetrix assumes no responsibility with regard to the performance or use of these
products. Under copyright laws, no part of this user guide may be reproduced or transmitted in any form or by any means, electronic or mechanical, with
out permission in writing from Symetrix, Inc. If, however, your only means of access is electronic, permission to print one copy is hereby granted. Product
names mentioned herein may be trademarks and/or registered trademarks of their respective owners.
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