Symetrix 421 Effect Processor
Manufacturer:
Symetrix

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Model:
421
Date:
1993
Category:
Equipo de música profesional
Group:
Effect Processor
Description:
AGC-Leveler

Information

The Symetrix 421 is a wide-range AGC-Leveler, a peak limiter, and a downward expander. The 421 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. A fast peak limiter puts an absolute ceiling on the output level so you know that peaks are held to the level that you set. A downward expander reduces the gain when signal levels fall too low to process, reducing the noise buildup at low signal levels. Speech filters allow reducing the bandpass of the 421 to minimize feedback or Amplifier power waste caused by spurious out-of-band signals. AGC-Levelers can be used anywhere that you might need to reduce the dynamic range of an audio signal over a wide range of signal levels. Possible applications include: tape duplication (especially cassette), driving telephone lines, driving broadcast or STL transmitters, podium or lectern microphones，paging systems, unattended sound systems, and music recording. The 421 is Listed by Underwriters Laboratories Inc. (UL). Samples of this product have been evaluated by UL and meet the applicable UL Standards for Safety.

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Servicio y Manual del usuario
Manual type:
Servicio y Manual del usuario
Pages:
60
Size:
2.89 Mbytes (3028925 Bytes)
Language:
english
Revision:
1.3
Manual-ID:
530202
Date:
12 January 1993
Quality:
Documento Scaned, todo legible.
Upload date:
23 December 2017
MD5:
ef685b19e8bc5ce8110885dcee341d89
Downloads:
593

Information

1.Introduction ... 1.1 Manual Sections…… ... 1.2 Operator Safety Summary ... 1.2.1 Equipment Markings■■… ... ■•… ... "…■= 1.2.2 Terms ... 1.3 Other Safety Information ……… ... 2. AGC-Leveler Basics ... ■■…••…"… 2.1 Introduction ... ………… ... 2.2 Definitions ... 2.3 A Bit of History." ... 2.3.1 Silence Detectors Don't Work ... 2.4 A Better Way ... 2.4.1 The AGC-Leveler ... 2.4.2 A Smart Downward Expander" ... 2.4.3 Peak Limiter Provides Absolute Peak Prote 2.4.4 Is Wideband Response Really Necessary? 2.4.5 Automatic Make-up Gain ... 3. Technical Tutorial ... 3.1 Matching Levels vs Matching Impedances■… 3.2 Signal Levels ... 3.3 i/O Impedances ... 3.4 Polarity Convention ... 3.5 Input and Output Connections ... 4_ Front Panel Overview ... 5. Rear Panel Overview ... 5.1 Grounding ... 6. Fast First Time Setup ... 6.1 Connections ... 6.2 Initial Setup ... Using the 421 ... Block Diagram ... Installation ... Using the Sidechain Jacks .■… ... Optimizing Control Settings ... StereoUnk and Bypass Switching 8. Applications ... 8.1 Broadcast Telephone Line Driver.■… 8.2 Conference or Courtroom Recording 8.3 Foreground Music ... 8.4 Americans with Disabilities Act ... 8.5 Lectern-mounted Microphones ... 8.6 Live PA ... 8.7 Mixdown ... 8. Applications ... 8.8 Papina Systems ... 8.9 Secondary Sound System Feeds ... 8.10 Tape Duplication (especially in churches) ... 8.11 Teleconferencing ... …………… 8.12 Theatre and Auditorium Cue Systems…… ... 8.13 Post Production" ... …… 9. Troubleshooting Chart ... 10- 421 AGC-Leveler Limited Warranty ... 11.Repair Information ... 11.1 Return Authorization ... …………………… ... 11.2 In-Warranty Repairs ... 11.3 Out-of-Warranty Repairs ... 12. Specifications ... 13-13.PCB Layouts and Schematics ... ……"… 13.1 Troubleshooting Hints ... 13.2 Additional Reading ... Appendix A. Architects and Engineers Specification Appendix B. Disassembly Instructions■…… ... Top Cover Removal ... …… ... Circuit Board Removal..

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