306 Manual - Full Compass
Contents
1. Duck Level Hold Time Depth Control Program Release Time Output Controls Mix This control sets the relative volume levels of the page signal and the program material If the page signal is coming through too softly relative to the program material turn this control counterclockwise until the desired balance is achieved If the page signal is too loud compared to the program material turn this control clockwise until the desired balance is achieved LED This LED is a warning light which illuminates just before clipping distortion occurs in the output stage of the 306 This LED should never light or should only flash occasionally on peaks in the program material or page signal If the LED stays on turn the Gain control counterclockwise until the LED extinguishes Gan dB The Gain control is the final volume adjustment Once you have achieved the desired balance between page signal and program material use the GAIN control to determine the overall output level of the 306 Turning this control clockwise increases the volume and turning this control counterclockwise decreases the volume To neither add nor subtract gain at this stage set the Gain control to the 12 o clock position the unity gain position for this control Power LED This LED lights to indicate the presence of power at the Power INPUT receptacle on the rear of the 306 C co O Symetrix O2. O 60 BYPASS 25e 45 SS 45 PAGE PROGRAM 20 420 Front panel HO gt OUTPUTS v PROGRAM INPUTS O Symetrix pr MANUFACTURED BY SYMETRIX ING LYNNWOOD RIGHT LEFT d Sensenseq INPUT POWER UOL POWER ow ONLY FABRIQU AUX E U PAR SYMETRIX INC LYNNWOOD WA USA REFEREZ TOUTE A R PARATION A UN TECHNICIEN QUALIFI MIC LINE 306 PREAMP DUCKER Rear panel etrix Operator Safety Summary Equipment Markings CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN TO REDUCE THE RISK OF FIRE OR WARNING ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE RISQUE DE CHOC ELECTRIQUE AVIS NE PAS OUVRIR SEE OWNERS MANUAL VOIR CAHIER D INSTRUCTIONS No user serviceable parts inside Refer servicing to qualified service personnel ll ne se trouve a l interieur aucune piece pourvant entre repar e l usager S adresser a un reparateur comp tent 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
3. Symetrix Rear Panel Overview Chapter 5 Symetrix PAGE y MIX OUTPUTS PAGE INPUT MANUFACTURED BY SYMETRIX INC LYNNWOOD DIRECT OUT A USA THIS PRODUCT CONTANS NO USER RIGHT LEFT SERVIGABLE PARTS h gt Hh gt th gt Seoseoseo PHANTOM POWER SUPPLY ONLY FABRIQU AUX EU PAR SYMETRIX INC LYNNWOOD WA USA R F REZ TOUTE R PARATION UN TECHNICIEN QUALIFI MIC LINE 306 PREAMP DUCKER Power Input This is a 7 pin DIN power receptacle Connect only the Symetrix PS 3 120V power supply Symetrix PS 3E 230V power supply or Symetrix PS 3 Y power supply splitting cable for powering two Symetrix units to the Power INPUT receptacle Connect the AC power connector of the PS 3 or PS 3E to an AC power source that is of the correct voltage and frequency as marked on the PS 3 or PS 3E PAGE Direct Out This Euroblock terminal connector provides line level balanced output of page signal only no program material The balanced output terminal pins are ground low and high For unbalanced operation use the high and ground terminal pins Do not ground the low terminal pin This output may be used to feed paging signal to another paging system Mix Output RIGHT This output contains paging signal combined with the right ch
4. a mix control which determines the ratio of page signal to program signal and a gain control which controls the level of signal present at the mix outputs There shall be a clip LED which lights to indicate that output distortion is imminent The 306 shall have left channel and right channel line level outputs accessible by either one stereo pair of unbalanced RCA jacks or one pair of balanced Euroblock detachable terminal connectors The 306 shall also have a page direct output which provides line level page only signal This balanced output shall have one Euroblock detachable terminal connector The preamp ducker shall be a Symetrix Inc model 306 Preamp Ducker Specifications Input Output Connections Maximum Input Level 20dBu Balanced 20dBu Unbalanced Page Input XLR Program Input Impedance gt 20k Ohms Balanced Program Inputs RCA jacks Euroblock gt 10k Ohms Unbalanced Mix Outputs RCA jacks Euroblock Input Common Mode rejection gt 40dB mic and line inputs Page Direct Output Euroblock Microphone Phantom Power 15V Power In 7 pin DIN Maximum Output Level 26dBu Balanced 20k Ohm load Physical 22dBm Balanced 600 Ohm load Size hwd rack unit Output Impedance 400 Ohms Balanced 200 Ohms Unbalanced 1 75 x 8 5 x 6 5 in 4 445 x 21 59 x 15 875 Performance Data Shipping Weight 4 5 lbs Page Frequency Response 50Hz to 15kHz 0 1 dB Electrical Program Frequency Response 20Hz to 20kHz 0 1dB Power Requirements 120V nomina
5. all of the above the 306 is not powering up correctly consult a qualified service technician or the Symetrix factory There is no output signal Is the power LED on If not see above Is the Output Gain control set at 0 or higher Check input and output cables and connections Determine that there really is signal coming from the paging source and the program material source and that these signals are reaching the 306 Is the Mic Line switch on the Page Input set to the correct position for your paging source If you are connecting a condenser paging mic that does not have its own power supply to the Page Input of the 306 is the Phantom switch set to the in position Try setting the Mix control to the 12 o clock position Is the Duck LED lit If so try turning the Threshold control clockwise If the Threshold control is set counterclockwise the ducker could be triggered by ambient or other random noises present at the page mic Shorter Hold time and Release time settings may help also Distortion in the output signal Is the Clip LED on If it is turn the Output Gain down Check your signal sources to make sure that the incoming signals are not already distorted before they reach the 306 Check your input signals Are they overdriving any of 306 s inputs If so reduce the incom ing signal level Is the distortion occurring in both the paging signal and in the program material signal If the distortio
6. be free from defects in material and workman ship 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 by Symetrix via United Parcel Service surface to any location within the Continental United States At Buyer s request the shipment may be returned via airfreight at Buyer s expense 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
7. on the outside of the box 5 Ship the unit to Symetrix freight prepaid We do not accept freight collect shipments Repairs made in warranty will cost you only one way freight charges We ll prepay the return surface freight If you send us your product in substandard packaging we will charge you for factory ship ping materials If you don t have the factory packaging materials please use an oversized carton wrap the unit in a plastic bag and surround it with bubble wrap Pack the box full of Styrofoam peanuts Be sure there is enough clearance in the carton to protect the rack ears you wouldn t believe how many units are returned with bent ears We will return the unit in Symetrix packaging Of course if the repair 1s due to operator error parts and labor will be charged In any event if there are charges for the repair costs 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 Chapter 11 Declaration of Conformity Declaration of Conformity We Symetrix Incorporated 14926 35th Ave West Lynnwood Washington USA declare under our sole responsibility that the product 306 Preamp Ducker to which this
8. 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 consum ers for personal family or household use Symetrix expressly disclaims all implied warran ties 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 a
9. 306 Preamp Ducker User s Guide O Symetrix Symetrix Table of Contents Chapter 1 Introduction Chapter 2 Operator Safety Summary Chapter 3 Fast Setup Chapter 4 Front Panel Overview Chapter 5 Rear Panel Overview Chapter 6 Applications Chapter 7 Troubleshooting Chapter 8 Specifications Chapter 9 Block Diagram Chapter 10 Warranty and Service Chapter 11 Declaration of Conformity Rev A 30 April 1999 Symetrix part number 53306 0A00 Subject to change without notice 1999 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 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 AH A N 12 13 15 Symetrix 14926 35th Ave West Lynnwood WA 98037 USA Tel 425 787 3222 Fax 425 787 3211 Email symetrix symetrixaudio com Chapter 1 Introduction Congratulations on your purchase of the Symetrix 306 Preamp Ducker Like the other units in the Symetrix 300 series the 306 is designed to provide extremely versatile contr
10. EFT RIGHT LEFT 00500560 soosoo RIGHT TO PAGE LINE INPUTS ON ANOTHER 306 PROGRAM INPUTS esa mans SETE mom mom h th LL Qu tart A 900800900 jseoseo 306 PREAMPDUCXER RIGHT RIGHT 1 EITHER TYPE Y CONNECTION 17 EITHERTYPE 4 Y W connection SET PHANTOM OFF AND MIC LINE TO LINE 2ND SOUND SYSTEM PROGRAM SOURCE FOR 2ND ZONE SIGNAL THAT WILL BE DUCKED MAIN SOUND PAGE MICROPHONE SYSTEM MAIN PROGRAM SOURCE SIGNAL THAT WILL BE DUCKED Perhaps your installation requires one type of program material for one area such as a lobby or concourse and a second type of program material for another area such as a lounge but the same announcements need to be heard in both locations This would call for two Symetrix 306 s Connect the paging source to the Pace Input of the first 306 taking care to set the Mic LINE switch to the appropriate position Then connect the desired program source to the Program Inputs of the first 306 Using a short balanced shielded cable connect the PAGE DIRECT Out of the first 306 to the PAGE Input of the second 306 Set the Mic LiNE switch on the second 306 to the line posi tion and connect the appropriate program source to t
11. alert the user of the presence of important operating and maintenance servicing instructions in the literature accompanying the product i e this manual 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 blades can be fully inserted Terms Several notational conventions are used in this manual Some paragraphs may use Note Caution or Warning as a heading Certain typefaces and capitalization are used to identify certain words These are Note Identifies information that needs extra emphasis A Note generally supplies extra information to help you to better use the 306 Identifies information that if not heeded may cause damage to the 306 or other equipment in your system Identifies information that if ignored may be hazardous to your health or that of others Controls switches or other markings on the 306 s chassis Strong emphasis Caution Warning CAPITALS Boldface Chapter 2 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 Symetrix PS 3 or PS 3E power supply Grounding The chassis of this product is grounded through the grounding conductor of the PS 3 or PS 3E power cord To avoid electric shock plug the pow
12. annel of the program material in the proportions determined by the setting of the Mix control on the front panel of the 306 This line level output is available at the Mix Output Euroblock terminal connec tor balanced and at the Richt Mix Output RCA connector unbalanced Mix Output Lert This output contains paging signal combined with the left channel of the program material in the proportions determined by the setting of the Mix control on the front panel of the 306 This line level output is available at the Lert Mix Output Euroblock terminal connector balanced and at the LEFT Mix Output RCA connector unbalanced PROGRAM Inputs RIGHT Connect the right channel of your line level program source signal to be ducked to either the RIGHT PROGRAM INPUT Euroblock connector balanced or the RIGHT PROGRAM Input RCA connector unbalanced PROGRAM Inputs LEFT Connect the left channel of your line level program source signal to be ducked to either the LEFT PROGRAM Input Euroblock connector balanced or the LEFT PROGRAM Input RCA connector unbalanced PAGE INPUT Connect the paging source the signal that will cause ducking of program material to this XLR balanced input The XLR connector is wired Pin 1 ground Pin 2 high and Pin 3 low Be sure to set the PHANTOM and Mic LiwE switches to the appropriate positions PHANTOM switch Set this switch to the out off position unless yo
13. declaration relates is in conformity with the following standards EN 60065 Safety requirements for mains operated electronic and related apparatus for household and similar general use EN 55103 1 Electromagnetic compatibility Generic emission standard Part 1 Residential commercial and light industry EN 55103 2 Electromagnetic compatibility Generic immunity standard Part 1 Residential commercial and light industry The technical construction file is maintained at Symetrix Inc 14926 35th Ave West Lynnwood WA 98037 2303 USA The authorized representative located within the European Community is World Marketing Associates P O Box 100 St Austell Cornwall PL26 6YU U K Date of issue April 30 1999 Place ofissue Lynnwood Washington USA Authorized signature Dane Butcher President Symetrix Incorporated C co O Symetrix 15 9 Symetrix Symetrix Inc 14926 35th Ave West Lynnwood WA 98037 2303 USA Tel 425 787 3222 Fax 425 787 3211 Website http www symetrixaudio com Email symetrix symetrixaudio com
14. er 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 thesafety purposeofthegrounding 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 electrician for replacement of the obsolete outlet Danger from Loss of Ground Ifthe protective ground connection is lost all accessible conduc tive 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 Operating Locatio Do not operate this equip mentunder 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 produce heat Unplug this apparatus during lightning storms or when unused for long periods of time Stay Out of the Box To avoid p
15. ersonal 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 manufacturer Clean only with a damp cloth User serviceable parts There are no user serviceable parts inside the 306 In case of failure refer all servicing to the factory Servic ing is required when the 306 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 Chapter 3 Fast Setup Fast First Time Setup This section provides simple instructions to begin using the 306 Please refer to later chapters for detailed descriptions of product features and applications e the THRESHOLD control to the 9 00 position e Set the DEPTH control to the 12 00 position e Set the Horn and RELEASE controls to the 9 00 position e Set the Mix control to the 12 00 position e Set the Gain control completely counterclockwise e Connect the 306 to an appropriate source of AC power using the Symetrix PS 3 or PS 3E power supply provided with your 306 Set the PHANTOM Power and MIC LINE switches located on the back panel to the correct positions e Connect your audio inputs and outputs e Turn up the Gan control until the desired volume level is reached e No
16. he PRoGRAM Inputs of the second 306 etrix etrix To Duck or Mute Program Material without Passing Page Audio DUCKER OUTPUT THRESHOLD dBv DEPTH dB HOLD RELEASE MIX GAIN dB 20 30 2 Sec 2 Sec 0 2 2 Ly ML AL AL A XML DUCKER DUCK DE 205 X CLIP 20 ix o 40 0 60 BYPASS 25 Sec 4Sec 5Sec 4 Sec PAGE PROGRAM 20 420 Syme Perhaps you have small localized sound system that needs to be ducked when a page on a separate paging system occurs but you don t want the page audio to appear at the outputs of the localized sound system An example of this might be a museum exhibit which has its own localized sound system that needs to be ducked when a page occurs on the larger museum wide paging system Connect the page signal from the separate paging system to the Pace Input of the 306 Set the Mix control completely clockwise toward Program and the page audio will cause ducking but will not pass to the outputs of the 306 Adjust the amount of ducking with the Depth control Another example of this type of use may be seen when visiting a certain family oriented pizza restaurant chain These restaurants feature a 15 minute animated show at the top of the hour every hour and the rest of the time background music is played The animated show has its own sound system to focus attention on the show and the background music needs to be muted when the animated show occurs In t
17. his instance you would connect the background music to the PROGRAM Inputs of the 306 Then connect an audio feed from the animated show to the PAGE Input of the 306 making sure to set the Mic LINE switch to the proper position Set the DEPTH control completely counterclockwise and set the Mix control completely clockwise This type of system is also used in some large airports Each gate has its own small localized paging system on which flights arriving and leaving at that gate are announced and on which background music may be played A larger separate paging system services the entire airport To mute the small sound systems at each gate when an announcement is made on the larger airport wide paging system connect a line level local paging signal to the PRoGRAM INPUT S of the 306 Connect an audio feed from the larger airport wide paging system to the 306 s PAGE INPUT taking care to set the Mic Line switch to the correct position Then set the DEPTH control completely counterclockwise and set the Mix control completely clockwise Chapter 7 Troubleshooting The power LED does not light Are you using the correct Symetrix power supply for your location For areas with 120V AC power the Symetrix PS 3 is correct For locales with 230V AC power the Symetrix PS 3E is the correct power supply Check the power supply connections at the 306 and at the AC power source Is the AC power source actually providing power If after checking
18. l 95 to 130V AC Page Path THD Noise lt 02 Mic input to direct page output 50 to 60 Hz 10 watts 150 Ohm source 230V nominal 207 to 253V AC 50 Hz 10 watts Program Path THD Noise lt 025 4dBu in 4dBu out OdB ducking Output Gain 20dB In the interest of continuous product improvement Symetrix Inc reserves the right to alter change or modify these specifications without prior notice 1999 Symetrix Inc All rights reserved 11 etrix O Sym 12 PHANTOM V O MIC LINE Block Diagram Chapter 9 LEFT Et LEFT BALANCED BALANCED PROGRAM IN MIX OUT m rn a LEFT UNBALANCED can PROGRAM IN LEFT 177 UNBALANCED dic mE jj MXOUT BALANCED MIX Le PROGRAM IN Li BALANCED 77 MIX OUT RIGHT hn UNBALANCED PROGRAM IN Mi puck THRESHOLD RIGHT UNBALANCED DEPTH M CONTROL MECOUT HOLD CIRCUITRY RELEASE sf hot DIRECT PAGE OUTPUT aS Chapter 10 Warranty amp Service 306 Limited Warranty Symetrix Inc expressly warrants that the product will
19. llocable 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 or substitute facilities or supply houses cS co O Symetrix Servicing the 306 If you have determined that your 306 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 Before sending anything to Symetrix contact our Customer Service Department for a return authorization RA number The telephone number is 425 787 3222 Monday through Friday 8AM 0800 hours though 4 30 PM 1630 hours Pacific Time 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 In warranty Repairs To get your 306 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
20. n is occurring only in the paging signal check your paging source If your paging source is line level did you set the 306 s Mic Line switch to the out position If the distortion is occurring only in the program material signal then you may be feeding the 306 a program signal that is too hot Are you using the correct Symetrix power supply for your locale PS 3 for 120V AC power PS 3E for230V AC power No ducking is occurring Is the Depth control turned clockwise bypass Try turning this control counterclockwise Is page signal reaching the 306 Do you hear the page C co O Symetrix 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 The input may be too low in level If so boost the incoming signal Check the setting of the Mic Line switch for the 306 s Page Input If the incoming page signal is Mic level make sure that the Mic Line Switch is set to the in position If the incoming page signal is Line level the Mic Line switch must be set to the out position Are one or both of the input signals already noisy Listen up stream from the 306 to determine that you are feeding it clean signals The 306 doesn trespond properly Consult a qualified service technician or the Symetrix factory Chapter 8 Specification
21. nues the pages should be clearly heard but the transition between paging and music should not be too obtrusive In this case we recommend that you duck the background music by 10 20dB and use a longer RELEASE setting to create a smooth transition from paging back into music Also you should set the threshold low enough to engage the ducker when a page is made but high enough that the ducker is not falsely triggered by ambient noise present at the page mic Foreground Music Paging with Emergency Override DUCKER OUTPUT THRESHOLD dBv DEPTH dB HOLD RELEASE MIX GAIN dB 20 30 2 Sec 2 Sec 0 cra m AR ALL ts She Ake Sle DUCKER DUCK 20 X W D CLIP XD 8 U Symetrix 40 0 60 BYPASS 25 Sec 4Sec 5 5 4 Sec PAGE PROGRAM 20 20 x If you have a foreground music or paging system that you wish to override in the case of an emergency you will want the ducking action to be swift and thorough Connect the foreground music source or line level paging system output to the PRoGRAM INPUT S of the 306 Connect the emergency paging source to the PAGE INPUT and set the Mic LINE switch to the appropriate position Use a low threshold setting for increased sensitivity and set the DEPTH control com pletely counterclockwise for maximum ducking We also recommend long Hop and RELEASE settings to prevent the program material from returning too quickly Paging in Multiple Paging Zones RIGHT L
22. ols within a streamlined half rack sized housing Once installed in a paging foreground music system the 306 offers precise adjustments to automatically reduce the gain of a program signal when paging occurs This allows the page to be heard clearly without having to compete with program material such as audio from a CD radio TV or other sources The Symetrix 306 has a selectable mic line page input with phantom power available for condenser microphones When the mic switch position is selected preamplification is applied to the page microphone signal to bring it up to line level A line level direct page output is also provided by the 306 for added flexibility The left and right program inputs and mix outputs of the 306 allow for mono or stereo operation Front panel controls tailor the amount and duration of ducking balance the mix between page and program signals and provide overall volume control We recommend that you read this guide cover to cover You will find the answer to most of your questions inside If you have technical questions beyond the scope of this manual please contact our Customer Service Department at Phone 425 787 3222 Fax 425 787 3211 Email symetrix symetrixaudio com Website www symetrixaudio com DUCKER OUTPUT THRESHOLD dBv DEPTH dB HOLD RELEASE MIX GAIN dB 306 xl v RE Vly 1 Pt Bk d DUK 2 2 p a 2 2 2 ES DUCKER SN TN FRA FIN
23. s Architects and Engineers Specifications The 306 preamp ducker shall provide page over music capability The unit shall occupy one half rack space 1 2U The page input shall have one female XLR balanced input The page input shall have a rear panel pushbutton which shall engage the preamp circuitry to provide a low impedance microphone input or bypass the preamp circuitry to provide a high impedance line input The page input shall also have a rear panel pushbutton which shall apply 15V phantom power to the page input The preamp ducker shall have left channel and right channel line level program inputs accessible by either one stereo pair of unbalanced RCA jacks or one pair of balanced Euroblock detachable terminal connectors The 306 shall incorporate a priority ducking system When audio is present at the page input the signal present at the program inputs shall be ducked There shall be a threshold control which determines the minimum level of page audio that will trigger the ducking function There shall also be a duck LED which lights to indicate that ducking is occurring A depth control shall set the amount of ducking that occurs There shall be a hold control that determines the amount of time that ducking continues once the page signal has dropped below threshold A release control shall determine the how quickly program material to return to normal levels after the hold time The output section of the 306 shall incorporate
24. se the amount of ducking that occurs when the ducker has been triggered decreases When the DEPTH control is completely clockwise bypass no ducking will occur even when the ducker s threshold has been exceeded Ho tp This control determines the amount of time that ducking will continue at the level deter mined by the DEPTH control once the page signal has dropped back below the ducking threshold As this control is turned clockwise the hold time is increased This causes the program material to be ducked for a longer amount of time before the ducker releases and allows the program signal to return to normal Turning the control counterclockwise creates a shorter hold time which causes the ducker to release more quickly Longer hold times contribute to overall smoothness whereas shorter hold times allow the program level to return to normal more quickly RELEASE The RELEASE control determines the amount of time that it will take for the program material to be restored to its original unducked level once the hold time has passed Setting this control clockwise causes a longer smoother return to normal program level Setting this control mer Threshold Level counterclockwise allows Page the program level to Input recover more swiftly after a Level page Long release times also contribute to an overall smooth sound and shorter release times allow for a swifter return to normal program levels
25. ur paging source is a con denser microphone which requires phantom power If your paging source is a condenser micro phone which requires phantom power set this switch to the in on position Mic LiNE switch Set this switch to the line position if your paging source is a line level source such as the output of a mic preamp If your paging source is a mic level source such as the output of a microphone set this switch to the mic position to engage the 306 s microphone preamp AGE MIX OUTPUTS PROGRAM INPUTS PAGE INPUT pRANTOM T Pj DIRECT OUT RIGHT LEFT o RIGHT LEFT h h h rh 90 20090 joeocoo J UU UII TO PAGE INPUT LINE LEVEL OF ANOTHER 306 306 PREAMP DUCKER EITHER TYPE CONNECTION CAN BE USED HOUSE SOUND SYSTEM PROGRAM SOURCE PAGE MICROPHONE SIGNAL THAT WILL BE DUCKED Chapter 6 Applications Foreground Music with Paging DUCKER OUTPUT THRESHOLD DEPTH dB HOLD RELEASE MIX GAIN dB 20 30 2 Sec 2 Sec 0 306 Vl Vly ly Al Vly 20 EE XP a DUCKER DUCK 23 eS 27 RS 2 7 27 7 27 C CLIP 77 CS 0 60 BYPASS 25Sec 4Sec 5Sec 4Sec PAGE PROGRAM O 20 20 This type of paging system is typically used in a restaurant shopping mall In these ve
26. w read the rest of this manual 9 Symetrix Front Panel Overview Chapter 4 DUCKER OUTPUT THRESHOLD DEPTH dB HOLD RELEASE MIX GAIN dB 2 30 2 8 2 Sec 0 ely XV XM DUCKER Ea XX O 295 205 205 CLIP 295 40 0 60 BYPASS 25 Sec 4Sec 5Sec 4 Sec PAGE PROGRAM o 20 20 2 5 9 Ducker Controls Duck LED This LED lights to indicate that the page signal has exceeded the ducker threshold see THRESHOLD below and ducking of the program material is occurring THRESHOLD This control adjusts the sensitivity of the ducker circuitry to signals at the page input Turning this control counterclockwise causes the ducker to be very responsive to a wide dynamic range of page signals This can be desirable if you want the ducker to react to page signals that range from very quiet to very loud Turning the THRESHOLD control clockwise causes the ducker to only react to higher level page signals This can be useful in preventing unwanted lower level signals from triggering the ducker DEPTH The DEPTH control governs the amount by which the program material will be decreased ducked when the ducker s threshold has been exceeded Maximum ducking occurs when this control is set counterclockwise The program material will then be ducked by 60dB virtually muted whenever the signal at the page input exceeds the ducker s threshold As the DEPTH control is turned clockwi
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