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562E

Introduction

Chapter 1

Typical gate setups, such as drum miking or
cleaning up multitrack recordings, all face the
same difficulty: how to apply a precise trigger to
imprecise, organic signal sources. Much to the
frustration of audio engineers, instruments and
vocalists produce natural audio waveforms, and
nature is rarely consistent. When nature meets
machine in audio processing, the results can
sound like the snap, crackle and pop you’d prefer
in your cereal, not your audio. Most gates offer
only one solution to this problem: open faster.
While they measure performance in microsec-
onds of "how fast", Symetrix is rewriting the rules
on how to open. The dual channel 562E
Windowing Expander/Gate exploits our newly-
developed, proprietary technology to enhance
gating and expander control. Ultimately the 562E
delivers unparalleled fidelity to any audio signal.

GATING: Gates may be used to clean up
virtually any type of musical instrument or audio
sound effect, but perhaps their most common use
is on drum and percussion tracks. The 562E
employs two unique tools for detecting and
controlling these audio events.

Window Advance is a proprietary system for
recognizing the signal to be gated. In simple
terms, it virtually creates the impossible: a gate
that opens just ahead of the audio signal. It
creates this impression by moving the statistical
energy center of the gated signal forward in time.
Window Advance permits the user to subtly delay
the signal energy, centering it within the enve-
lope. Through this function, the 562E’s gate
passes the entire leading edge of the audio
waveform. It accomplishes this because the gate
opens before the signal passes through the VCA.
Window Advance eliminates the noises and
chopped-off waveforms created by traditional
gates that struggle to open as quickly as possible
after the signal arrives.

AutoWindowing is a processing technique that
allows the user to maintain better control of the
gate envelope parameters. Its dynamic smooth-
ing process reduces “pops” and “clicks” that can
occur at fast attack settings. These nasty noises
are typically produced by envelope edges,
overshoot and instabilities. Even gates that claim
to open within microseconds fail to recognize the
reality underlying these problems: naturally
occurring waveforms do not have consistent
leading edges. In contrast, AutoWindowing
derives its trigger signal from the “time center” of
the leading edge of the audio waveform. This
reduces trigger uncertainty, jitters, and attack
distortion. AutoWindowing yields an envelope
that is consistent and natural-sounding. It also
increases envelope consistency by eliminating
the artificial “drop off” that occurs in most gates
at the end of the release cycle. In the 562E the
signal smoothly and continuously decreases at
the end of the release cycle, creating a much more
pleasing sound.

EXPANSION: The 562E also permits users to
have a distinctive choice between gating and
expansion. A downward expander is similar to a
gate, but the expander substitutes R

ATIO

control

for the gate’s R

ANGE

control. The expander is

ideal for tasks requiring more subtle control. To
all possible uses for an expander, the 562E
delivers superior performance through unique
technology. Even the 562E’s ratio circuitry is
special. The ratio automatically reverts to 1:1
when the signal approaches 25dB below the
threshold. This prevents any low level modula-
tion of the expanded signal.

For the first time, open your ears to all the clear
audio you wanted without any revenge from the
processor. Experience a quantum leap forward in
gate technology with the Symetrix 562E Window-
ing Expander/Gate.

TIME

RELEASE

TIME

1 Sec

500ms

EXPANDER RATIO

GATE RANGE

1:3

2.5 Sec

4 Sec

30ms

CHANNEL 2

CH2 SIDECHAIN PROCESSING

TIME

(dB)

ATTACK

60ms

GAIN (dB)

REDUCTI0N

ABOVE
BELOW

MAX

THRESHOLD

300ms

+20

AUTO

OFF

-40

MIN

HIGH CUT

20K

200Hz

50Hz

OUTPUT

15Hz

KEY LISTEN

ASSIGN

20Hz

LOW CUT

40K

400Hz

GATE/EXP.

10Hz

W/FILTER

WINDOW

ADVANCE

50ms

HOLD

CHANNEL 1

TIME

GATE RANGE

EXPANDER RATIO

500ms

HOLD

TIME

ATTACK

TIME

60ms

1 Sec

RELEASE

1:3

2.5 Sec

80dB

4 Sec

300ms

50ms

30ms

(dB)

THRESHOLD

ABOVE
BELOW

HIGH CUT

WINDOW

MAX

20K

ADVANCE

REDUCTI0N

GAIN (dB)

-40

+20

OFF

40K

400Hz

MIN

AUTO

LOW CUT

OUTPUT

200Hz

15Hz

ASSIGN

20Hz

50Hz

EXT.KEY

KEY LISTEN

10Hz

GATE/EXP.

BYPASS

W/FILTER

562

WINDOWING
EXPANDER/GATE

CH1 SIDECHAIN PROCESSING

BYPASS

EXT.KEY

CHANNEL 1 INPUT

UNBALANCED

BALANCED/

BALANCED

KEY

INPUT

BALANCED/

BALANCED
OUTPUTS

UNBALANCED

CHANNEL 1 OUTPUT

BALANCED

TYPICAL CONNECTIONS

SIDECHAIN

LOW(-)=PIN 3

HIGH(+)=PIN 2

GROUND=PIN 1

1/4"BALANCED

BALANCED

INPUTS

TIP=HIGH(+)

RING=LOW(-)

BALANCED

SLEEVE=GROUND

GROUND

SIDECHAIN OUT

KEY INPUT

SIDECHAIN

UNBALANCED

BALANCED/

KEY

INPUT

CHANNEL 2 OUTPUT

BALANCED

562

WINDOWING EXPANDER/GATE

MANUFACTURED IN LYNNWOOD, WASHINGTON USA

UNBALANCED

BALANCED/

AC INPUT
18 WATTS
MAXIMUM

FABRIQUÉ AUX E.-U. PAR SYMETRIX INC., LYNNWOOD, WA USA.

RÉFÉREZ TOUTE RÉPARATION À UN TECHNICIEN QUALIFIÉ.

CHANNEL 2 INPUT

Front panel

Rear panel

Содержание 562E

Страница 1: ...562E Windowing Expander Gate User s Guide 562E ...

Страница 2: ...notice 1997 Symetrix Inc All right reserved Symetrix is a registered trademark of Symetrix Inc 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 manual may be reproduced or transmitted in any for...

Страница 3: ...audio waveform This reduces trigger uncertainty jitters and attack distortion AutoWindowingyieldsanenvelope that is consistent and natural sounding It also increases envelope consistency by eliminating the artificial drop off that occurs in most gates at the end of the release cycle In the 562E the signal smoothly and continuously decreases at the end of the release cycle creating a much more plea...

Страница 4: ...62E or other equipment in your system Warning Identifiesinformationthat if ignored maybehazardousto yourhealthorthatofothers CAPITALS Controls switches or other markings on the 562E s chassis Boldface Strong emphasis Power source This product is intended to operate from a power source that does not apply more than 255Vrms between the power supply conductors or between either power supply conductor...

Страница 5: ... serviceable parts inside the chassis Refer all service to qualified servicepersonnelortothefactory Make your initial switch and control settings as follows SWITCH SETTING EXT KEY BYPASS IN IN KEY LISTEN W FILTER GATE EXP GATE EXP LOW CUT CCW 10Hz HIGH CUT CW 40K WINDOW ADVANCE MAX THRESHOLD 10 ATTACK TIME AUTO HOLD TIME GATE ONLY 50ms RELEASE TIME 300ms GATE RANGE IF GATING 80dB EXPANDER RATIO IF...

Страница 6: ...ocessed by the LOW CUT and HIGH CUT filters This is helpful in fine tuning the effect of the LOW CUT and HIGH CUT filters on the key sidechain audio The GATE EXP switch position routes the gated expanded audio to the output of the 562E The GATE EXP switch position is the normal operating position for the 562E LOW CUT control Adjusts the cutoff frequency 3dB down point of a high pass filter that is...

Страница 7: ...e output signal When this control is set to twelve o clock you will not have any expander or gate action because the twelve o clock position corresponds to 0dB change for gating and to a 1 1 ratio change in input equals change in output for expansion ATTACK TIME control Determines the speed at which the expander gate reaches zero attenuation when the input signal rises above threshold The AUTO ATT...

Страница 8: ...essing device The wiring diagram for the KEY INPUT connector is repro duced on the back panel of the 562E Note Remember to set the front panel EXT KEY BYPASS IN switch to the EXT KEY position when using the KEY INPUT BALANCED UNBALANCED OUTPUT 1 4 inch tip ring sleeve TRS phone jack wired tip high ring low and sleeve ground Use this jack when you need a 1 4 inch balanced or unbalanced output The n...

Страница 9: ...ets 5 dB quieter causes a 15 dB decrease at the output In other words a small drop in the input signal level 5 dB occurring below threshold turns into a much larger drop in signal level at the output 15dB A special feature of the 562E s ratio circuitry is that the ratio automatically reverts to 1 1 when the input signal approaches 25dB below threshold For example let s say that you set the THRESHO...

Страница 10: ...elease control of a gate expander allows the user to shape the trailing edge of the sound envelope by manipulating the release time The RELEASE TIME control setting can make the transfer between sound and silence graceful or it can make the transfer abrupt Release time is the length of time required for the gain to recover to the no signal state When you are using the 562E in GATE mode release tim...

Страница 11: ...the 562E more sensitive to high frequencies in the key input signal use an equalizer graphic or parametric inserted in the key signal path after the key signal source and before the 562E to boost the high frequencies in the sidechain signal This increases the sensitivity of the control circuits to those particular frequencies so the expander gate responds more to those frequencies than any others ...

Страница 12: ...ilters on the internal sidechain audio set the EXT KEY BYPASS IN switch to the IN position and the OUTPUT ASSIGN switch to the KEY LISTEN W FILTER position Listening to the EQ d key sidechain signal allows you to hear the signal that will control the 562E and to more easily find the range that you wish to emphasize or de emphasize When you are done listening to the EQ d key sidechain signal return...

Страница 13: ...this does not predispose them to only this usage After all 1 4 inch jacks are sometimes used for loudspeakers which are anything but high impedance Therefore the presence of 3 pin XLR connectors should not be construed to mean that the input or output is low impedance or high impedance The same applies to 1 4 inch jacks So what is really important Signal level and to a much lesser degree the imped...

Страница 14: ...into 600 ohm balanced loads or 18 dBm into 600 ohm unbalanced loads Polarity Convention The 562E inputs and outputs use the international standard polarity convention of pin 2 hot Therefore if your system uses balanced inputs and outputs and uses the 562E this way then the polarity convention is unimportant If your system is both balanced and unbalanced then you must pay attention to this especial...

Страница 15: ...than the balanced output FROM BALANCED OUT TO UNBALANCED IN FROM ELECTRONIC NON TRANSFORMER BALANCED OUTPUT TYPICAL OF SYMETRIX PRODUCTS TO UNBALANCED INPUTS FROM BALANCED OUT FROM UNBALANCED OUT FROM BALANCED OUT FROM BALANCED OUT FEMALE XLR PIN 1 GROUND PIN 2 HIGH PIN 3 LOW MALE XLR PIN 1 GROUND PIN 2 HIGH PIN 3 LOW MALE TS PLUG TIP HIGH SLEEVE GROUND LOW MALE RCA PLUG TIP HIGH SLEEVE GROUND LOW...

Страница 16: ...ry whisper in its vicinity or going into feedback Setup for these applications is easy With no signal and the GATE RANGE EXPANDER RATIO control either clockwise for expanding or counterclockwise for gating adjust the THRESHOLD control counterclockwise until you begin to see gain reduction on the LED display Continue until you hear the degree of expansion gating that you want When the signal is pre...

Страница 17: ...are drum is false triggering This is most often caused by audio leakage into the snare mic from the hi hat and or kick drum The 562E s LOW CUT and HIGH CUT filters are designed to eliminate just such a problem First and foremost employ good mic technique to reject as much of the sound that is causing the false triggering as possible Start with the 562E s LOW CUT knob in the full counterclockwise p...

Страница 18: ...g of the THRESHOLD LOW CUT and HIGH CUT controls but it can make a huge contribution towards ease of life for the monitormixingengineer First set up the 562E using the downward expander with a fairly fast release time The threshold should be set to trigger on normal level speech Set the OUTPUT ASSIGN switch to KEY LISTEN W FILTER If the stage setup does not include a drum kit you can skip the next...

Страница 19: ...EY BYPASS IN switch to EXT KEY set the OUTPUT ASSIGN switch to GATE EXP and set the WINDOW ADVANCE switch to MAX Set the THRESHOLD control counterclockwise set the ATTACK TIME and RELEASE TIME controls to a medium setting set the HOLD TIME counterclockwise and set the GATE RANGE control counterclockwise Begin rotating the THRESHOLD control clockwise until gating occurs Then fine tune the THRESH OL...

Страница 20: ...se downward expansion When using the 562E on the subgroup outputs of the console use gating for the outputs carrying a fast transient signal for example drums or percussion For subgroup outputs dedicated to signal sources with gentler dynamics such as vocals use slower ATTACK TIME RELEASE TIME and HOLD TIME settings when gating or use downward expansion CHANNEL 1 TIME GATE RANGE EXPANDER RATIO 500...

Страница 21: ...el 10 dBu or greater Make sure that the signal you are feeding to the 562E is a line level signal not mic level Check gain settings on downstream equipment The system gain structure should be such that the 562E operates at or near unity gain Is the input signal already noisy No gating or expansion Did you connect the output cable to the KEY IN jack instead of the OUTPUT jack Is the EXT KEY BYPASS ...

Страница 22: ...oise 1kHz Signal Noise Dynamic range Frequency response Attacktime Attenuation Chassis size AC requirements Power consumption 2 XLR and 1 4 TRS 22 dBu 22 dBu 20K Balanced 10K Unbalanced 600 ohms Balanced 03 4 dBu 94 dB 112 dB 0 3dBm 10 Hz to 40 kHz Program Dependent to 300 milliseconds 80 dB max adjustable 1 75 H x 19 W x 4 25 D 117V ac nominal 230V ac nominal 18 watts maximum In the interest of c...

Страница 23: ...e arising out of con nected with or resulting from the manufac ture sale delivery resale repair replace ment or use of any product will not exceed the price allocable to the product or any part thereof which gives rise to the claim In no event will Symetrix be liable for any inciden expresslydisclaimsanyIMPLIEDwarran ties including fitness for a particular purpose or merchantability Symetrix s war...

Страница 24: ...ts Just do these five things and repairs made in warranty will cost you only one way freight charges We ll prepay the return surface freight If you choose to send us your product in some sort of flimsy packaging we ll have to charge you for proper shipping materials If you don t have the factory packaging materials then do yourself a favor by using an oversize carton wrap the unit in a plastic bag...

Страница 25: ...sion standard Part 1 Residential commercial and light industry EN 50082 1 Electromagnetic compatibility Generic immunity standard Part 1 Residential commercial and light industry EN 55022 Limits and methods of measurement of radio interference characteristics of information technology equipment Thetechnicalconstructionfileismaintainedat Symetrix Inc 6408 216th St SW Mountlake Terrace WA 98043 USA ...

Страница 26: ...562E 24 Symetrix Inc 6408 216th St SW Mountlake Terrace WA 98043 USA Tel 425 778 7728 Fax 425 778 7727 Website http www symetrixaudio com Email symetrix symetrixaudio com ...

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