Symetrix 610 User Manual

Model 610

Broadcast Audio Delay

User's Guide

Revision 1.4, 9 July, 1997

Symetrix part number: 530610

Subject to change at our whim and fancy, without notice.

Copyright 1996, Symetrix, Inc. All rights reserved.

Symetrix is a registered trademark of Symetrix, Inc.

Orban and OPTIMOD are registered trademarks of AKG Acoustics, 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 form or by any means, electronic or mechanical,

including photocopying, scanning, recording or by any information

storage and retrieval system, without permission, in writing, from

Symetrix, Inc.

Symetrix, Inc.

6408 216th St. SW

Mountlake Terrace

Email: [e-mail]

Website: www.symetrixaudio.com

, WA 98043 USA

Voice: [phone]

Fax: [phone]

i

Contents

1 Introduction 1
2 Safety Information 2

Operator safety summary 2

Other safety information 3

3 Summary Product Description 4

Front panel view 4

Rear panel view 5

4 Installation 6

AC line connection 6

Mounting in an equipment rack 6

Audio input connections 7

Audio output connections 7

Typical system block diagram 7

Remote indicator and control interface connections 7

5 Operation 8

Operational Status 8

The INPUT HEADROOM(dB) display 8

The START DELAY button 9

The EXIT DELAY button 9

The DELAY TIME (SECONDS) display 10

Lamp Functions 10

6 Troubleshooting 11

Solutions to common problems 11

Less common problems 11

7 Warranty and Service 12

The Symetrix 610 Limited Warranty 12

Servicing the 610 13

Return authorization 13

In-warranty repairs 13

Out-of-warranty repairs 13

Appendix A Specifications 14

Architects and engineers specifications 14

Technical specifications 14

Appendix B Remote Indicator and Control Interface Wiring 15

Remote panel switch pinouts 15

Remote panel LED pinouts 15

Cart machine start opto isolator pinouts 15

Typical remote panel switch wiring 16

Typical remote panel LED wiring 16

Appendix C Default Configuration 17

START DELAY and EXIT DELAY speed 17

Full memory dump or 3.75 second dump 17

Default configuration programming 18

ii

1

Introduction

Congratulations on your decision to use a Symetrix model 610 Broadcast Audio Delay. The 610

has been designed to give broadcasters unequaled performance combined with ease of use and

reliability. This manual will guide you through the installation and operation of the 610, and

provide valuable tips on how to interface with other equipment in your studio or control room.

The 610 gives the host or producer of a talk show the power to prevent the broadcast of unwanted

profanities or comments from telephone callers. As the program begins, the 610 gradually and

unobtrusively delays or "stretches out" the program until 7 1/2 seconds of 14kHz bandwidth

stereo audio is stored in memory. When a person on the telephone line says something the host or

producer does not think appropriate for the broadcast, he or she presses the DUMP PROFANITY

button and the memory is cleared, thereby preventing the unwanted audio from reaching the

airwaves. Meanwhile, the host releases the offending caller from the telephone line and proceeds

with the program. After the DUMP PROFANITY button has been pressed, the 610 automatically

begins to stretch (time expand) the program audio again until the full 7 1/2 second delay is

attained.

Several minutes in advance of the end of the talk show, the host or producer presses the EXIT

DELAY button and the 610 begins to time compress the program audio until there is nothing left

in the 610's memory (zero seconds delay). At this point the program is back in "real time" and the

610 automatically removes itself from the signal path.

A unique feature of the 610 is the COUGH button, which allows the host to make impromptu

interruptions in the program for up to 7 1/2 seconds while keeping the audience unaware of the

break. When the COUGH button is pushed, the 610 plays from memory while the button is held

in. As soon as the button is released, the 610 automatically begins to refill the memory. The host

can cough, have a quick drink of water, or make a comment to the producer or engineer without

any perceptible program interruption.

The 610 uses the latest in delta-sigma conversion technology coupled with advanced digital

signal processing (DSP) algorithms. This combination produces a product that meets or exceeds

the highest broadcast standards in terms of low noise, low distortion, and superb signal process-

ing.

The 610's logical, easy to use control panel holds no hidden surprises. The product is easy to

learn and simple to use. In the sections that follow you'll find information on installation, opera-

tion, and specific applications of the 610. We follow this with a troubleshooting guide, warranty

and service information, and detailed specifications.

As with all Symetrix products, the 610 has been designed and built to the highest standards of the

broadcast industry. Our company is committed to excellence in product design, manufacturing,

and service. Please do not hesitate to contact us with your questions or comments.

Page 1

2

Safety Information

Operator safety summary

The information in this summary is intended for persons who operate the equipment as well as

repair personnel. Specific warnings and cautions are found throughout this manual wherever they

may apply; they do not appear in this summary.

The notational conventions used in this manual and on the equipment itself are described in the

following paragraphs.

Equipment markings

WARNING:

ATTENTION:

No user serviceable parts inside. Refer servicing to qualified service personnel.

Il ne se trouve a l’interieur aucune piece pourvant entre reparée l’usager.

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

TO REDUCE THE RISK OF FIRE OR
ELECTRIC SHOCK DO NOT EXPOSE
THIS EQUIPMENT TO RAIN OR MOISTURE

RISQUE DE CHOC ELECTRIQUE
NE PAS OUVRIR

S’adresser a un reparateur compétent.

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 magni-

tude 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 mainte-

nance (servicing) instructions in the litera-

ture accompanying the 610 (i.e. this

manual).

Caution

Terms

To prevent electric shock, do not use the polarized plug supplied with the 610 with any extension

cord, receptacle, or other outlet unless the blades can be fully inserted to prevent blade exposure.

Several notational conventions are used in this manual. Some paragraphs may use Note, Caution,

or Warning as a heading. These headings have the following meaning:

Note Identifies information that needs extra emphasis. A Note generally supplies extra

information to help you to better use the 610.

Caution Identifies information that, if not heeded, may cause damage to the 610 or other

equipment in your system.

Warning Identifies information that, if ignored, may be hazardous to your health or

that of others.

In addition, certain typefaces and capitalization are used to identify certain words. These are:

CAPITALS Controls, switches or other markings on the 610's chassis.

Boldface Strong emphasis.

Page 2

Other safety information
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 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.

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. Use only a cord that is in good

condition.

Proper fuse

The fuse is mounted internally and is not considered user serviceable. The fuseholder accepts

American sized fuses (1/4 inch diameter) or European sized fuses (5mm diameter). For 117VAC

operation, the correct value is 1/2A, 250VAC, fast blowing (Bussman type AGC). For 230VAC

operation, the correct value is 1/4A, 250VAC, slow blowing (Bussman type MDL or GDC).

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.

Stay out of the box

To avoid personal injury or injury to others, do not remove the product covers or panels. Do not

operate the product without the covers and panels properly installed.

Page 3

3

Summary Product Description

This chapter provides a basic overview of the 610 by describing the input and output connections,

power connection, operating controls, front panel LED indicators, and the remote indicator and

control interface. Use this information to acquaint yourself with the product. Chapter 4 (Installa-

tion) gives details on installing the 610 in your system and Chapter 5 (Operation) gets into

specific applications and uses of the 610 in detail.

Front panel view (left)

016

BROADCAST

AUDIO DELAY

STATUS

BYPASS
OPERATE

INACTIVE ACTIVE

DELAYDELAY

33

036912151824 2130 27

START DELAYEXIT DELAYINPUT HEADROOM (dB)

EXIT DELAY buttonSTATUS (BYPASS/OPERATE) button

INPUT HEADROOM LED display

START DELAY button

 The STATUS button places the 610 in either BYPASS or OPERATE modes. In BYPASS mode

the incoming signals are directly routed (via relays) to the 610's outputs, thereby bypassing any

internal circuitry. In BYPASS mode, the front panel and remote controls have no effect on the

operation of the 610. In OPERATE mode, the incoming signals are processed through the 610's

analog and digital circuitry, and all front panel and remote controls are fully functional.

 The INPUT HEADROOM(dB) LED display indicates the headroom in decibels before the

onset of input clipping. The display indicates the higher (i.e. worst case) of the two incoming

stereo channels.

 The EXIT DELAY button initiates the gradual reduction of delay time. Once this button is

pressed, assuming no other control button is subsequently pressed, the 610 will proceed to

incrementally reduce delay time until a zero delay is achieved.

 The START DELAY button initiates the gradual increase of delay time. Once this button is

pressed, assuming no other control button is subsequently pressed, the 610 will proceed to

incrementally increase delay time until a 7 1/2 second delay is achieved.

Front panel view (right)

COUGH button

Page 4

DELAY TIME (SECONDS)COUGH DUMP PROFANITY

DUMP PROFANITY button

DELAY TIME LED display

7.576.55.554.53.5 42.5 321.51.50 6

Abstract but deeply meaning­ful graphic symbol (ADMGS)

 Pressing the COUGH button mutes the incoming signal while allowing the output signal to play

ESSPRESSPR

-10 dBV

+4 dBu

LEVEL (dB)

RIGHT INPUT

NOMINAL OPERATING

LEFT OUTPUT RIGHT OUTPUT

REMOTE INDICATOR AND

CONTROL INTERFACE

.

Y

LEFT INPUT

(uninterrupted) from the 610's memory. The 610 will continue to play from memory for so long

as the button is pressed. When the COUGH button is released, the 610 resumes recording into

memory and "splices out" the silence created while the button was pressed. The 610 then begins

to rebuild the delay time used while the COUGH button was pressed. The listener will be aware

of a program interruption if and only if the button is held for a time exceeding the time in

memory.

 Assuming the memory contains the maximum 7 1/2 seconds of audio, and the 610 is config-

ured for full memory dump, pressing the DUMP PROFANITY button erases the entire memory.

The 610 proceeds to splice back together everything except the erased audio. If no other control

button is subsequently pressed, the 610 will proceed to incrementally increase delay time until a

7 1/2 second delay is again achieved. See Chapter 5 and Appendix C for details on the 3 3/4

second (partial dump) option and a more detailed explanation of the DUMP PROFANITY

function.

Rear panel view (left)

610

BROADCAST AUDIO DELAY

AC INPUT connector

REMOTE INDICATOR AND CONTROL INTERFACE

 The AC INPUT connector accepts nominal AC power sources of 117 volts or 230 volts [see

Appendix A (Specifications) for voltage tolerance ranges]. See chapter 4 (Installation) for details

on the detachable (IEC) power cable.

 The REMOTE INDICATOR AND CONTROL INTERFACE provides a way to connect to a

user supplied remote control and/or indicator panel. See Appendix B for details.

 The LEFT OUTPUT and RIGHT OUTPUT audio connectors are electronically balanced, line

level, low impedance outputs. Pin 1 is ground. Pin 2 is high. Pin 3 is low.

Rear panel view (right)

AC INPUT

20W MAXIMUM

MANUFACTURED IN THE USA BY

THIS UNIT CONTAINS NO

USER SERVICEABLE PARTS.

LEFT OUTPUT RIGHT OUTPUT

REMOTE INDICATOR AND

CONTROL INTERFACE

LEFT OUTPUT audio connector

RIGHT OUTPUT audio connector

NOMINAL OPERATING LEVEL select button

 The NOMINAL OPERATING LEVEL select button matches the 610's input sensitivity to the

nominal output level of the device (normally the on-air console) driving the 610. The two options

are +8dBu and +4dBu. See Chapter 4 (Installation) for further discussion of signal levels.

 The LEFT INPUT and RIGHT INPUT audio connectors are electronically balanced, line level,

bridging inputs. Pin 1 is ground. Pin 2 is high. Pin 3 is low.

LEFT INPUT audio connector

RIGHT INPUT audio connector

Page 5

4

S

Installation

Before you plug the 610 into a wall socket, carefully read the information in the following

chapter.

AC Line connection

A sticker on the right end of the unit (as viewed from the front) indicates the nominal voltage

setting for the unit as it left the Symetrix factory. If this does not correspond to the voltage setting

for your locale then do not attempt to apply power to the 610. Instead, return the unit to your local

Symetrix distributor for modification.

The 610 is shipped from the Symetrix factory with a detachable AC power cable (IEC standard)

included. Depending on the intended destination, the power plug is either the US type (intended

for 117VAC use), or the Europlug type. If the power cable's plug is not right for your locale, then

please contact your local Symetrix distributor for the proper cable.

Once you have determined that the 610's operating voltage matches that of your locale and you are

ready to begin, follow these steps:

1 Plug the socket end of the power cable into the recessed AC power receptacle on the back

of the 610.

2 Plug the other end of the power cable into a three-hole grounded outlet or power strip.

W ARNING

The 610 is intended to be electrically grounded. It has been provided with a

three-wire grounding plug - a plug that has a third (grounding) pin. This plug will fit only

a grounded AC outlet. This is a safety feature. If you are unable to insert the plug into the

outlet, contact a licensed electrician to replace the outlet with a properly grounded outlet.

Do not defeat the purpose of the grounding plug!

Mounting in an equipment rack

The 610 occupies one rack space (1U) in a standard equipment rack with a width of 19" (48.3cm),

a depth of 7.5"(19.1cm), and a height of 1.75"(4.45cm). Allow at least 4"(10.16cm) behind the

unit for the protrusion of connectors. We recommend you take care not to mount the 610 next to

devices that emit large electromagnetic fields, such as audio power amplifiers. To do so may

comprise the noise performance of the 610. The 610 has been designed to conform to mechanical

guidelines as described in EIA Standard RS-310-C and IEC Recommendation 297.

Audio input connections

The 610's audio input connections are via standard female XLR jacks located on the rear panel.

For optimum system performance we recommend that the 610 be connected to balanced signal

sources. If this is not practical in your situation, then you may connect to unbalanced sources. The

following diagram illustrates recommended cable wiring practices.

Female XLR

Pin 1=Ground

Pin 2 = High

Pin 3 = Low

Analog Source 610 Analog Input

213

132

Male XLR
Pin 1=Ground
Pin 2 = High
Pin 3 = Low

Male 1/4" Tip-Ring-Sleeve Plug

Sleeve = Ground

Page 6

Tip = High

Ring = Low

TIP

RING

LEEVE

123

Male XLR
Pin 1=Ground
Pin 2 = High
Pin 3 = Low

Audio output connections

S

The 610's audio output connections are via standard female XLR jacks located on the rear panel.

For optimum system performance we recommend that the 610 be connected to balanced devices. If

this is not practical in your situation, then you may connect to unbalanced devices. The following

diagram illustrates recommended cable wiring practices.

Female XLR

Pin 1=Ground

Pin 2 = High

Pin 3 = Low

Female XLR

Pin 1=Ground

Pin 2 = High

Pin 3 = Low

Typical system block diagram

In most broadcast applications it is recommended that the 610 be connected between the station's

on air console and the station's audio processing equipment. In other words, the console's main

stereo (or mono) output bus should connect to the 610's inputs, and the 610's outputs should feed

the "down stream" signal processing. As discussed in Chapter 5 (Operation), the 610 will auto-

matically remove itself from the signal path when not in use.

BROADCAST
AUDIO DELAY

610 Output

321

23
1

INACTIVE

STATUS

DELAY

106

BYPASS
OPERATE

Destination device input

Male XLR

54 4.53 3.52 2.51 1.5.50

5.5

Pin 1=Ground
Pin 2 = High
Pin 3 = Low

76 6.5 7.5

Male 1/4" Tip-Ring-Sleeve Plug
Tip = High
Ring = Low

Sleeve = Ground

312

TIP

RING

LEEVE

Input Output

INPUT HEADROOM (dB)

DELAY
ACTIVE

03961521 1827 2433 30 12

START DELAYEXIT DELAY

DUMP PROFANITYCOUGH

DELAY TIME (SECONDS)

Output Input

Signal Levels

The 610 has been designed to operate at standard nominal broadcast signal levels of either 0VU =

+4dBu or 0VU = +8dBu. The 610's rear panel NOMINAL OPERATING LEVEL button allows

you match the 610 to either of these standards. If your console's nominal output level is lower than

the +4dBu standard then you may wish to use a line amplifier to boost your input to the standard

level. If you choose operate the 610 below standard line levels you may notice some decrease in the

signal to noise ratio at the output of the 610.

Page 7

5

Operational status

Operation

This section describes in detail the 610's front panel controls and LED indicators.

The STATUS button places the 610 in either BYPASS or OPERATE modes. In BYPASS mode

the incoming signals are directly routed (via relays) to the 610's outputs, thereby bypassing any

internal circuitry. In BYPASS mode the front panel and remote controls have no effect on the

operation of the 610. In OPERATE mode, when the delay is active, the incoming signals are

processed through the 610's analog and digital circuitry, and all front panel and remote controls

are fully functional.

It is recommended that the STATUS button remain in the OPERATE (inward) position at all

times. Typically, the 610 would be placed in the BYPASS mode only if the unit were to malfunc-

tion. By design, two circumstances force the 610's audio bypass relays to route the incoming

signal directly to the 610's output. The first being loss of mains (AC) power to the 610 and the

second being the normal operational function of EXIT DELAY (explained in detail below). Once

the 610 has achieved zero time delay as a result of the EXIT DELAY button being pressed, the

audio bypass relays automatically remove the 610 from the signal path until the START DELAY

button is pressed.

There are two LED's associated with the STATUS button. The LED to the left of the button,

labeled DELAY INACTIVE, lights whenever the 610 has been forced to a bypass state. This can

happen automatically as a result of the EXIT DELAY function or manually as a result of moving

the STATUS button to the BYPASS position.

The LED to the right of the STATUS button, labeled DELAY ACTIVE, lights whenever the 610

has been forced to operational status. This happens only as a result of the START DELAY

function (explained in detail below).

INPUT HEADROOM (dB) display

The INPUT HEADROOM (dB) LEDs indicate the headroom in decibels before the onset of input

clipping. The display indicates the higher (i.e. worst case) of the two incoming stereo channels.

While the 610 has no front panel input level control, a rear panel OPERATING LEVEL button is

provided (see discussion below), allowing you to select between nominal +4dBu and +8dBu

operating levels. Whatever your input levels are, fine adjustment of the input signal must be done

ahead of the 610 (typically with the master buss control fader of the broadcast console).

The incoming signal level should be adjusted so that at least 6dB of headroom is maintained at

all times. As digital devices go, the 610 is very quiet. Therefore, to ensure against any possibility

of clipping, you may wish to decrease input levels even further and operate with as much as 12dB

of headroom.

Page 8

The START DELAY button

The START DELAY button initiates the gradual increase of delay time. When a radio talk show

is to begin, the first action for the operator of the 610 is to press the green START DELAY

button. Pressing the START DELAY button switches the 610 out of hard-wire bypass. Once this

lighted button has been pressed, it's light will blink for as long as delay time is increasing. The

DELAY TIME LED display on the right end of the 610's front panel displays the amount of time

in memory at any given instant. From a starting point of zero delay time, the amount of time that

it takes to achieve the maximum 7 1/2 second delay depends upon the 610's default configuration

setting (see Appendix C for details). Once the START DELAY button is pressed, assuming no

other control button is subsequently pressed, the 610 will proceed to incrementally increase delay

time until a 7 1/2 second delay is achieved.

The EXIT DELAY button

The EXIT DELAY button initiates the gradual decrease of delay time. Several minutes in ad-

vance of the end of a radio talk show, the operator of the 610 must press the yellow EXIT DE-

LAY button. Once this lighted button is pressed, its light will blink as long as delay time is

decreasing. The DELAY TIME LED display on the right end of the 610's front panel displays the

amount of time in memory at any given instant. Assuming that the delay is at the maximum of 7

1/2 seconds, the amount of time that it takes to reduce the delay time to zero seconds depends

upon the 610's default configuration setting (see Appendix C for details). Once the EXIT DELAY

button is pressed, assuming no other control button is subsequently pressed, the 610 will proceed

to incrementally decrease delay time until a zero delay time has been reached. Once zero delay

has been reached, the DELAY INACTIVE LED lights and the 610's audio bypass relays revert to

the bypass position.

The COUGH button

The COUGH button allows the host to make impromptu interruptions in the program for up to 7

1/2 seconds (or the maximum amount of time in memory, whichever is less) while keeping the

audience unaware of the break. When the COUGH button is pushed and held in, the 610 plays

from memory and mutes incoming audio. As soon as the button is released, the 610 resumes

recording into memory and "splices out" the silence created while the audio was muted. The 610

then begins to rebuild the delay time used while the COUGH button was pushed. The host can

cough, have a quick drink of water, or make a comment to the producer or engineer without any

perceptible program interruption. If the COUGH button is pressed for an amount of time exceed-

ing the amount of time in memory, the result will be muted output audio (dead air).

The DUMP PROFANITY button

The DUMP PROFANITY button should be pressed as soon as an unwanted comment is heard.

Once pressed, the audio in memory is instantly erased. If memory has built up to the full 7 1/2

seconds then the 610 automatically "splices" around the erased audio so the audience hears no

dead air. If less than the full 7 1/2 seconds (2 seconds, for example) have accrued in memory at

the time the button is momentarily pressed, then the two seconds are erased and the program is

now on-the-air at real time. Please understand that if the talk show host has not given the 610

time to build up to 7 1/2 seconds of delay when he momentarily hits the DUMP PROFANITY

button an obscenity may get on the air.

Units with Version 1.05 software allow the host extra protection in the form of muting if he

Page 9

purposely holds down the DUMP PROFANITY button. Holding down the button would erase

the two seconds from memory and mute the output of the 610 until the DUMP PROFANITY

button is released. This provides a "panic button" function for use if all hell breaks loose. The

muting function does not activate when the DUMP PROFANITY button is pushed and quickly

released.

After a DUMP PROFANITY command the 610 automatically reenters the START DELAY mode

and the delay memory begins accruing until the full 7 1/2 seconds are achieved.

Alternatively, the 610 can be set up so that only 3 3/4 seconds of memory are deleted the first

time the button is pushed, thereby maintaining a 3 3/4 second reserve. This allows the host to

bring another caller on air right away without having to wait for the memory to build up from

zero. As in the case of the full 7 1/2 second dump, if the 610 has accrued only two seconds in

memory when the DUMP PROFANITY button is pushed, the host will have only two seconds of

protection and the program will be on-the-air at real time. The 610 offers the host extra protection

in the form of muting if he purposely holds down the DUMP PROFANITY button. Holding

down the button would erase the two seconds from memory and mute the output of the 610 until

the DUMP PROFANITY button is released. This provides a "panic button" function for use if

things get too crazy. The muting function does not activate when the DUMP PROFANITY

button is pushed and quickly released.

See Appendix C (Default Configuration) for details on how to select between full memory dump

or partial (3 3/4 second) dump.

The DELAY TIME (SECONDS) display

As explained on the previous page, the DELAY TIME LED display indicates the time duration of

the program audio in the 610's memory at any instant. If the 610 has been manually placed in

BYPASS mode, or if the delay memory is zero seconds as a result of the EXIT DELAY function,

all DELAY TIME LEDs will be off. The display is calibrated in .5 second intervals from zero to 7

1/2 seconds.

Lamp Functions

The following summarizes the functioning of the front panel push-button lamps (and correspond-

ing remote panel LEDs, if used) while the 610 is in OPERATE mode.

FLASH - delay time decreasing

SOLID ON - delay is zero, unit bypassed

OFF - all other times

FLASH - delay time increasing

OFF - all other times

SOLID ON- full 7.5

seconds of delay

achieved

SOLID ON - while button pressed

OFF - all other times

COUGH DUMP PROFANITYSTART DELAYEXIT DELAY

FLASH - for 5 seconds after

button has been pressed

OFF - all other times

Page 10

6

Troubleshooting

Solutions to common problems

There is no output signal.

Check the AC power connections to the 610.

Check input and output cables and connections.

Determine that there really is a signal coming from the source and that it is getting to the 610.

Distortion in the digital output signal.

Check the input signal. Is it overdriving the 610's input? If so, the INPUT HEADROOM display

should indicate so.

Is the incoming signal already distorted? Listen "up stream" from the 610 (or manually place the

unit in BYPASS mode) to determine that you are feeding it a clean signal.

Buzz in the output

Check input and output connector wiring.

Check for ground loops between interconnected system equipment.

Are all system components on the same AC ground?

Noise (hiss)

Check input signal levels and input level control settings. The input may be too low in level. If

so, boost the signal from your console or input source.

Is the input signal already noisy? Listen "up stream" from the 610 to determine if you are feeding

it a clean signal.

Less common problems

The 610 doesn't power up or doesn't respond properly.

Consult a qualified service technician or the Symetrix factory.

The 610 is not plugged in, but works great anyway.

Consult your doctor or therapist.

Page 11

7

The Symetrix 610 Limited Warranty

W arranty and Service

Symetrix, Inc. expressly warrants that the product will be free from defects in material and

workmanship for one (1) year. Symetrix's obligations under this warranty will be limited to

repairing or replacing, at Symetrix's option, the part or parts of the product which prove defective

in material or workmanship within one (1) year from date of purchase, 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, includ-

ing fitness for a particular purpose or merchantability. Symetrix's warranty obligation and

buyer'sremedies 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, Symetrix expressly 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.

Warranty Registration must be completed and mailed to Symetrix within thirty (30) days of the

date of purchase.

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.

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 inciden-

tal 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.

Page 12

Servicing the 610

If you have determined that your 610 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 five 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 [phone], Monday through

Friday, 8AM (800 hours) through 4:30 PM (1630 hours), Pacific Time.

In-warranty repairs

To get your 610 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 choose to send us your product in some sort of flimsy, non-Symetrix 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 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 (you wouldn't believe how many units are returned

with bent ears). We won't return the unit in anything but Symetrix packaging for which we will

have to charge you. Of course, if the problem turns out to be operator inflicted, you'll 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 materi-

als, and freight charges. Please remember, you must call for an RA number before sending the

unit to Symetrix.

Page 13

A

Specifications

appendix

Architects and engineers specifications

The Broadcast Audio Delay shall be a stereo model whose output is delayed by as much as 7 1/2 seconds, thereby

allowing the operator to delete or "dump" unwanted audio The Broadcast Audio Delay shall occupy one rack space

(1U).

The inputs shall be active balanced bridging designs terminated with 3-pin XLR (AES/IEC standard wiring) female

jacks.

The outputs shall be active balanced designs terminated with 3-pin XLR (AES/IEC standard wiring) male jacks.

Overall frequency response shall be 20Hz to 14kHz, +1,-1dB, measured at +4dBu output. There shall be no more than

0.1% harmonic distortion measured under the following conditions: +4dBu input, +4dBm output, 7 1/2 second delay,

1000Hz test frequency.

When the unit is inoperative (either by loss of power, or via the BYPASS switch), the inputs and outputs shall be wired

together.

The Broadcast Audio Delay shall be capable of operating by means of its own built-in power supply connected to 117V

nominal AC (105 to 130V), 50/60 Hz and 230V nominal AC (207 to 253V), 50 Hz.

The Broadcast Audio Delay shall be a Symetrix, Incorporated model 610 BROADCAST AUDIO DELAY.

Architects and engineers specifications
Technical specifications

Audio

Inputs Stereo, balanced bridging
Outputs Stereo, electronically balanced
Maximum input level +22dBu
Maximum output level +22db u into 600 ohms

Frequency Response

Dynamic Range >80dB
Crosstalk -55dB, +4dBu in, 20Hz-14kHz
Input common mode rejection >60dB @ 1kHz

±1dB, 20Hz-14kHz(in full delay)

-3.5dB@10kHz (building and exiting delay)

Physical

Input connectors XLR
Output connectors XLR
Polarity Pin 2 high
Chassis size 1.75" H x 19" W x 7.5" D

4.45cm H x 48.3cm W x 19.1cm D
Shipping weight 8 lbs, 3.64kg

Electrical

Power 117VAC, nominal, 105-130VAC, 50-60Hz
230VAC, nominal, 207-255VAC, 50Hz
Power Consumption 15 watts, maximum

Page 14

In the interest of continuous product improvement, Symetrix, Inc.
reserves the right to alter, change, or modify these specifications
without prior notice.

Copyright 1995, Symetrix, Inc. All rights reserved.

B

appendix

Remote Indicator and Control Interface Wiring

Many of the 610's most important control buttons and LED indicators may be wired to a user

supplied panel via the DB-25 multi-pin male connector on the 610's rear panel. In addition, a

control current loop is provided for triggering optically isolated control input ports such as those

found on cart machines. The current flows for 100 milliseconds every time the DUMP PROFAN-

ITY button is pressed. The following tables detail the pin functions. The remote switches and

LED indicators are electrically isolated from the switches and LEDs on the 610's front panel, but

effectively operate in parallel (i.e. simultaneously) with them.

Remote panel switch pinouts

Function Pin #

START DELAY 1

EXIT DELAY 4

DUMP PROFANITY 7

COUGH 10

Emergency BYPASS 14

Switch Common 13

Remote panel LED indicator pinouts

Function LED Cathode LED Anode

3.5 Seconds pin 3 pin 2

7 1/2 Seconds pin 6 pin 5

START DELAY pin 9 pin 8

EXIT DELAY pin 12 pin 11

Note

The remote switches used should be high quality,

momentary, single pole, push button type. All

switches should return to pin #13, the switch

common point.

Note

If the 610's STATUS has been forced to BYPASS

mode by the front panel button, the only way to

return the 610 to OPERATE mode is to depress the

front panel button. It cannot be done remotely.

Note

Internally within the 610, all LED

anodes connect to +10V and all

LED cathodes to +.6V through 330

ohm resistors.

DUMP PROFANITY pin 16 pin 15

COUGH pin 18 pin 17

BYPASS pin 20 pin 19

OPERATE pin 22 pin 21

Cart machine start opto isolator pinouts

Cathode Anode Ground

24 23 25

Note

Pin 23 is internally connected to +10V through a

330 ohm resistor. An internal open collector (pin

24) returns current to ground. Current flows for 500

milliseconds whenever the DUMP button is pressed.

Page 15

Typical remote panel switch wiring

1

4

7

10

13

Typical remote panel LED wiring

3.5

ECONDS

7.5

SECONDS

3 6 12 9 16 18

START DELAY

EXIT DELAY

DUMP PROFANITY

COUGH

EXIT

DELAY

START
DELAY

DUMP

PROFANITY

COUGH

152 5 11 8 17

Note

The numbers within the circles refer to pins on the 610's rear panel DB-25 connector which is

labelled REMOTE INDICATOR AND CONTROL INTERFACE.

Page 16

C

appendix

Default Configuration

START DELAY and EXIT DELAY speed

As discussed in Chapter 5, the START DELAY button initiates the gradual increase of delay time

and the EXIT DELAY button initiates the gradual decrease of delay time. You may select be-

tween six different default configuation settings, the parameters of which are explained in detail

below. Selecting the right algorithm will optimize the match between the 610 and your particular

station's programming needs.

The amount of time required to increase delay from zero to 7 1/2 seconds (and to decrease delay

from 7 1/2 seconds to zero) may be partially program dependent (option 1 and 2), or non program

dependent fixed times (option 3,4,5, and 6). The program dependent options have the advantage

of potentially faster START and EXIT times. The fixed time options are advantageous in that the

operator knows exactly how long it will take to get to full delay and back to real time so that

broadcast programming decisions can be made based upon known quantities.

The default configuration (as shipped from the factory), which is referred to as option #1 in the

table on page 19, is partially program dependent. It takes no longer than 5 minutes to increase

from zero to 7 1/2 seconds delay (it can be much faster) and no longer than 5 minutes to go from

7 1/2 seconds delay back to zero. We recommend you try this option first. It represents the best

trade-off in terms of audio quality versus speed.

Full memory dump or half memory (3 3/4 second) dump

As discussed in Chapter 5, the DUMP PROFANITY function may be configured in either of two

ways: 1) when the DUMP PROFANITY button is pressed the entire content of the delay memory

is erased, or 2) when the DUMP PROFANITY button is pressed only 3 3/4 seconds of memory is

erased. With the second option, assuming there is a full 7 1/2 seconds in delay memory, the host

can dump one caller and put a second caller on air immediately, while the 610 automatically

continues to rebuild memory up to the 7 1/2 second maximum.

The default configuration (as shipped from the factory), which is referred to as option #1 in the

table on page 19, dumps only half of the memory each time the DUMP button is pressed. As

mentioned above, we recommend you try this option first. The two stage dump feature allows you

to bring a new caller on air immediately after dumping a previous caller without having to wait

for the delay to build from zero.

Page 17

Default configuration programming procedure

The 610 default configuration is set from the front panel. The process involves placing the 610 in

programming mode and selecting one of six possible configurations. It is not necessary to remove

the unit from the equipment rack, or to remove the top cover to configure or re-configure. The

unit must be powered up and not in use. Please note - the 610

tional!

The configuration settings are nonvolatile. Should power go down, the last configuration setting

is maintained. To program the 610 default configuration, proceed as follows:

Step #1 - Place 610 in BYPASS mode - Use the STATUS button at the left end of the 610 front

panel to place the 610 in BYPASS mode.

Step #2 - Initiate Programming Mode - Press all four front panel lighted push buttons (EXIT

DELAY, START DELAY, COUGH, DUMP PROFANITY) and hold until all four lights come on

(approximately five seconds). When you release the buttons all four will flash, indicating that the

610 is in programming mode.

X X X X

cannot be configured while opera-

COUGH DUMP PROFANITYSTART DELAYEXIT DELAY

Page 18

Step #3 - Select Desired Option - While all four lights continue to flash, select your option by

pressing a button or combination of buttons as indicated in the table on the following page. The

associated light(s) flash to confirm your selection. After several seconds the light(s) will stop

flashing, indicating that the 610 has left the programming mode.

Step #4 - Return 610 to OPERATE mode - Use the STATUS button at the left end of the 610

front panel to place the 610 in OPERATE mode. The unit is now ready to operate.

Option #

COUGH DUMP PROFANITYSTART DELAYEXIT DELAY

1 X

2X

3X

4X

5 X X

6 X X

7 X X

8XX

Partially program dependent increase/decrease time,

1/2 memory (3 3/4 seconds) dump.

Partially program dependent increase/decrease time,

full memory dump.

4 minute increase/decrease time, 1/2 memory ( 3 3/4

seconds) dump.

4 minute increase/decrease time, full memory dump.

5 minute increase/decrease time, 1/2 memory (3 3/4

seconds) dump.

5 minutes increase/decrease time, full memory dump.

Partially Program Dependant, 3.5 second maximum

delay

3.0 minute increase/decrease, 3.5 second maximum

delay

Notes:

Option 1 -

Try this one first! This is the factory default option. It gives you the fastest increase/

decrease time, and the ability to dump only half the memory each time the profanity button is

pushed. This algorithm has minimal artifacts, i.e. it works well with music so you can play

commercials during the increase/decrease cycle.

Option 2 - Same as option 1 but with full memory dump.

Option 3 - Fixed 4 minute increase/decrease time with 1/2 memory dump. The 4 minute in-

crease/decrease time gives you predictable build up/build down times but you may notice some

pitch shifting of the audio with this option.

Option 4 - Just like option 3 but with full memory dump.

Option 5 - Fixed 5 minute increase/decrease time with 1/2 memory dump. The 5 minute increase/

decrease results in minimal pitch shifting as compared to options 3 and 4.

Option 6 - Just like option 5 but with full memory dump.

Option 7 - Partially program dependent delay build and exit. A 3.5 second delay and full delay

dump.

Option 8 - Fixed 3 minute delay build and exit. Has a 3.5 second delay time with full delay

dump.

Page 19

Website: http://www.symetrixaudio.com

Email: [e-mail]

Page 20

Symetrix, Inc.

6408 216th St. SW

Mountlake Terrace, WA, 98043

Tel: [phone]

Fax: [phone]