Symetrix 421m User Manual
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Symetrix 421m User Manual

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421m AGC-Leveler

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Summary of Contents for Symetrix 421m

  • Page 1 421m AGC-Leveler...

  • Page 2: Table Of Contents

    Symetrix Part Number 53421M0C00 The information in this guide is subject to change without notice. Symetrix, Inc. shall not be liable for technical or editorial errors or omissions contained herein; nor is it liable for incidental or consequential damages resulting from the furnishing, performance, or use of this material.

  • Page 3: Chapter 1 Introduction

    The 421m reduces the dynamic range of its input signal by the amount of its ratio setting. That is, if the ratio setting is 2:1, then 40 dB of input range turns into 20 dB at the output.

  • Page 4: Operator Safety Summary

    User-serviceable parts There are no user and follow all warnings and instructions. and follow all warnings and instructions. ser vice able parts inside the 421m. In case serviceable parts inside the 421m. In case of Install in accordance with the manufacturer’s of failure, refer all servicing to the factory.

  • Page 5: Chapter 3 Front & Rear Panel Overview

    Using a 2:1 ratio, a 2dB drop in the input level results in a 1dB drop at the 421m’s output. With a 4:1 ratio, a 4dB drop at the input is limited to a 1dB decrease at the output.
  • Page 6 (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 reading meter.
  • Page 7 SERIAL NUMBER - Write this down in a safe place (how about the front of this user’s guide?). STEREO LINK - This 5-pin DIN female connector is used to link two 421m's for stereo operation. Refer to the STEREO INTERCONNECT section on page 6 for additional information.

  • Page 8: Chapter 4 Installation

    Symetrix factory. If this does not correspond to the voltage setting for your locale then do not attempt to apply power to the 421m. Instead, return the unit to your local Symetrix distributor for modification or replacement.
  • Page 9 To stereo-link two 421m’s, interconnect the STEREO LINK jacks found on the rear panels of the units using a five-pin DIN male to DIN male patch cord (Symetrix p/n 037010). This looks like a MIDI cable, and a MIDI cable may actually work if all five pins are actually connected to each other.

  • Page 10: Chapter 5 Operation

    SPEECH CURVE (125 Hz) SPEECH CURVE (6kHz) Apply an input signal to the 421m. Observe the input and output meters; there should be activity. The input meter reads the actual input signal. The output meter reads the actual output signal.
  • Page 11 If the STEREO LINK button is in the out position, the 421m is in slave mode which means the 421m gets its commands via the link cable from the master unit.

  • Page 12: Chapter 6 Applications

    421m on each microphone and feed the outputs of the 421m’s into the line inputs of your mixer. If separate 421m’s for each mic are not an option, then place a single 421m between the mixer output and the input of the tape recorder.
  • Page 13 You get the idea. What this means to you is roller-coaster audio levels. Try the 421m. It will do for a lectern or other announce microphones what no compressor has ever done before: consistent audio levels with increased freedom from feedback.
  • Page 14 (trans-hybrid loss) up to the same level as the caller, which isn t a good idea. The 421m helps by keeping the signal levels more consistent from caller to caller, which is a good idea.

  • Page 15: Chapter 7 Specifications

    The AGC shall be capable of operating by means of its own built-in power supply connected to 115V nominal ac (105 to 130V) 50/60 Hz (230V nominal, 210 to 260V ac, 50 Hz where applicable). The AGC shall be listed by Underwriters Laboratories Inc. (UL) or other equivalent nationally recognized safety testing agency. The unit shall be a Symetrix Incorporated model 421m AGC-Leveler.

  • Page 16: Chapter 8 Troubleshooting

    No output signal: Check cables and connections. Determine that there really is a signal coming from the source and that it is getting to the 421m. Verify cables by patching input and output connections together at the unit. Check for AC power presence.

  • Page 17: Warranty And Service

    Symetrix reserves the right to refund a prorated portion of the purchase price in full satisfaction of all warranty claims. In order to serve you better we require that the Buyer shall, prior to shipping Product to Symetrix for warranty service, contact Symetrix and secure a Return Authorization Number that shall be included with the returned Product.
  • Page 18 Servicing the 421m If you have determined that your 421m 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.

  • Page 19: Appendix A Declaration Of Conformity

    6408 216th St. SW Mountlake Terrace, WA, 98043 The authorized representative located within the European Community is: World Marketing Associates P.O. Box 100 St. Austell, Cornwall, PL26 6YU, U.K. Place of issue:Mountlake Terrace, Washington, USA Authorized signature: Dane Butcher, President, Symetrix Incorporated.
  • Page 22 Symetrix, Inc. 6408 216th St. SW Mountlake Terrace, WA, 98043 Tel: (425) 778-7728 Fax: (425) 778-7727 Website: http://www.symetrixaudio.com Email: symetrix@symetrixaudio.com...

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