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562E

10

The 562E’s internal sidechain signal can also be equalized in this manner.  To insert an equalizer in the
sidechain, set the E

XT

.K

EY

/B

YPASS

/I

N

 switch to the E

XT

. K

EY

 position.  Connect an insert cable from the

K

EY

 I

NPUT

 of the 562E to the input and output of your equalizer as illustrated in the drawing below.

The 562E’s K

EY

 I

NPUT

 jack is wired :  TIP=RETURN, RING=SEND, and SLEEVE=GROUND.

If the expander/gate is being triggered by an unwanted high frequency signal (such as a squeaky
kick drum pedal), you can prevent the expander/gate from responding to that portion of the key
signal by cutting high frequencies and/or boosting low frequencies in the key signal. This can be
accomplished by careful adjustment of the corresponding threshold control, combined with the
boost/cut provided by the H

IGH

 C

UT

 filter and/or the EQ in the sidechain.

Note

See also “Preventing False Triggering by Hi-hat and Kick While Gating a Snare Drum” on page 15.

If low frequency signals transmitted through a desk or podium are triggering the 562E’s expander
unnecessarily, use the L

OW

 C

UT

 filter to remove the low frequencies from the control signal, or use

an equalizer in the sidechain to boost the voice-range frequencies in the control signal.

Hint:

You can save time, and make your life easier, by listening to the equalized external key
signal or to the equalized internal sidechain signal (instead of the 562E’s G

ATE

/E

XP

.

output).  When using an external equalizer, listen to the equalized key/sidechain signal by
setting the E

XT

.K

EY

/B

YPASS

/I

N

 switch to the E

XT

.K

EY

 position, and the O

UTPUT

 A

SSIGN

switch to the K

EY

 L

ISTEN

 

W

/F

ILTER

 position.  If you are not using an external equalizer, and

you want to hear the effect of the L

OW

 C

UT

 and H

IGH

 C

UT

 filters on the internal sidechain

audio, set the E

XT

.K

EY

/B

YPASS

/I

N

 switch to the I

N

 position, and the O

UTPUT

 A

SSIGN

 switch

to the K

EY

 L

ISTEN

 

W

/F

ILTER

 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 the O

UTPUT

 A

SSIGN

 switch to the G

ATE

/E

XP

. position for normal operation.

Keep in mind that the threshold level becomes a function of the amount of overall gain through the equalizer,
including the boost.  If you increase the overall gain in the sidechain signal, by boosting selected frequencies
with the equalizer, you will need to also raise the T

HRESHOLD

 setting, in order to maintain the same signal level:

threshold level relationship that you had before boosting the frequencies.

Note

There is no substitute for good mic technique.  The more that you isolate the desired
signal from any undesired signal, using the rear-axis rejection characteristics of a
directional mic to your advantage, the easier it will be for you to achieve optimum gating
performance.  For example, when miking a snare drum that is to be gated, it is generally a
good idea to mic the snare drum with the rear of the mic towards the hi-hat cymbal, to
reduce the amount of hi-hat leakage into the snare mic, thus reducing the possibility of the
gate being falsely triggered by the hi-hat.  The sound picked up by each mic should be
primarily the sound of the desired signal.

CHANNE

UNBALANCED

BALANCED/

KEY

INPUT

BALANCED/

BALANCED
OUTPUTS

UNBALANCED

CHANNEL 1 OUTPUT

BALANCED

TYPICAL CONNECTIONS

1

3

SIDECHAIN

1

3

2

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

2

SIDECHAIN

ALANCED

LANCED/

CHANNEL 2 INPUT

EQ

Send

Return

Ground

Return

(from EQ output)

Send

(to EQ input)

Summary of Contents for 562E

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

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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 ...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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 ...

Page 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...

Page 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...

Page 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...

Page 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 ...

Page 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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