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421m

421m AGC-Leveler

Users Guide

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Summary of Contents for 421m

Page 1: ...421m 421m AGC Leveler Users Guide ...

Page 2: ...contained herein nor is it liable for incidental or consequential damages resulting from the furnishing performance or use of this material Mention of third party products is for informational pur poses only and constitutes neither an endorsement nor a recommendation Symetrix assumes no responsibility with regard to the performance or use of these products Under copyright laws no part of this user...

Page 3: ...been evaluated by UL and meet the applicable UL Standards for Safety We recommend that you read this manual from cover to cover Somewhere between the confines of the two covers you should find the answers to most of your questions If not please feel free to contact our Customer Service department via phone fax or e mail for answers to your questions The numbers are Telephone 425 778 7728 Fax 425 7...

Page 4: ...s been dropped AVIS NE PAS OUVRIR Il ne se trouve a l interieur aucune piece pourvant entre reparée l usager SEE OWNERS MANUAL VOIR CAHIER D INSTRUCTIONS S adresser a un reparateur compétent RISQUE DE CHOC ELECTRIQUE No user serviceable parts inside Refer servicing to qualified service personnel CAUTION WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MO...

Page 5: ... level required to make the AGC Leveler try to maintain the Target Output Level Once the signal falls below the AUTO RELEASE setting the AGC Leveler allows the signal to decrease When the input signal exceeds the AUTO RELEASE setting the AGC Leveler once again tries to maintain constant output level RECOVERY RATE Sets the basic recovery time Fast for speech slow for music or music speech Fast migh...

Page 6: ...Thiscontrolhard wirebypassesthe421m IfSTEREOLINKED alllinked slave units revert to bypass when the bypass button on the master unit is out On any individual slave unit that has been STEREO LINKED STEREO LINK button OUT this button has no effect INPUT LED This meter indicates the input signal level to the 421m It is a VU calibrated peak readingmeter OUTPUT LED This meter indicates the output signal...

Page 7: ...evel lowimpedanceoutputs XLR pin 1 is ground pin 2 is high and pin 3 is low The 1 4 connector tip is high ring is low and sleeve is ground The screw terminal output is wired in parallel to the ø and XLR connectors Rear panel view right LINE INPUT These connectors are electronically balanced line level bridging inputs The 1 4 connector tip is high ring is low and sleeve is ground The screw terminal...

Page 8: ...fthegroundingplug Mounting In An Equipment Rack The 421m occupies one rack space 1U in a standard equipment rack with a width of 19 48 3cm a depth of 6 5 16 8cm 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 421m next to devices that emit large electromagnetic fields such as audio power amplifiers To...

Page 9: ...21m s If you connect either connector to a MIDI device it probably won t harm anything but it definitely won t work Decide which unit is the master and which unit is the slave using force only if absolutely neces sary and set the front panel MASTER SLAVE switches accordingly In stereo mode the slave unit s controls are disabled and only the master unit controls affect operation The following diagr...

Page 10: ...GC Leveler interprets the fade as a decrease in signal level and raises the gain to try to maintain the level set by the TARGET OUTPUT LEVEL control In effect the AGC Leveler un does the fade which may or may not be allowable The AUTO RELEASE LEVEL control sets how far the signal level can fall before the AGC Leveler stops trying to raise the gain More CCW set tings lower this level which may be w...

Page 11: ...al level needed to cause gain re lease in the AGC Leveler A suggested method of setting it is with no signal present increase the setting of the ARL control until the green ACTIVE LED extinguishes Then further increase the control setting slightly For musical signals use the SLOW setting of the RECOVERY RATE button Set the AUTO RE LEASE LEVEL control so that the ACTIVE LED is extinguished during l...

Page 12: ...ble levels Most CD s simply have too much range for foreground or background music applications The 421m helps reduce the overall dynamic range while retaining some semblance of the music s original dynamics You can link two units together for stereo if desired There s probably no need to use the downward expander in this application so turn the THRESH OLD control to the BYPASS position Set the AG...

Page 13: ...ve PA Have you ever mixed live sound for someone who just can t play at the right level They re usually too soft when playing rhythm and too loud when playing leads A 421m can help you out Connect the 421m into the mixer s channel insert jack use a relatively low RATIO setting use the expander if you need to Remember that lower ratio settings allow for more dynamics than the higher settings which ...

Page 14: ...d in the audience area of a theatre or auditorium that feeds an amplifier that drives speakers located in the backstage areas of the hall The potential dynamic range in this application is tremendous ranging from an empty room to an audience on their feet making a plea for an encore A 421m in conjunction with close miking of the person calling the cues can work wonders keeping this sort of system ...

Page 15: ...ging from 54 VU to 12 VU 50 dBu to 16 dBu An output clipping indicator shall be provided The AGC shall provide facilities for stereo coupling two units via a shielded 5 pin DIN male to male cable A front panel switch shall designate which unit is the master and which unit is the slave The line level inputs shall be active balanced bridging designs terminated with 1 4 TRS female and screw terminals...

Page 16: ... with sine waves Use speech or music Distortion Is the incoming signal already distorted Listen up stream from the 421m or manually place the unit in BYPASS mode to determine that you are feeding it a clean signal Buzzintheoutput 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 in...

Page 17: ...ducts will be returned freight collect THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED ARISING BY LAW OR OTHERWISE INCLUDING WITHOUT LIMITATION ANY OBLIGATIONS OF THE SELLER WITH RESPECT TO CONSEQUENTIAL DAMAGES INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR USE AND OF ALL OTHER OBLIGATIONS OR LIABILITIES ON OUR PART AND WE NEITHER ASSUME NOR AUTHORIZE AN...

Page 18: ... 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...

Page 19: ... related apparatus for household and similar general use EN 50082 1 Electromagnetic compatibility Generic immunity standard Part 1 Residential commercial and light industry The technical construction file is maintained at Symetrix Inc 6408 216th St SW Mountlake Terrace WA 98043 USA The authorized representative located within the European Community is World Marketing Associates P O Box 100 St Aust...

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Page 22: ...421m 22 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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