Symetrix 528E User Manual
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Symetrix 528E User Manual

Voice processor
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User's Guide
528E
VOICE
PROCESSOR
www.SymetrixAudio.com

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Summary of Contents for Symetrix 528E

  • Page 1 ® User’s Guide 528E VOICE PROCESSOR www.SymetrixAudio.com...
  • Page 2 User’s Guide: 528E Voice Processor 6408 216th St. SW | Mountlake Terrace, WA 98043 | USA | Tel: +1 (425) 778.7728 | Fax: +1 (425) 778.7727 ®...

  • Page 3: Before You Begin

    Use only with the cart, stand, In case of failure, customers inside the U.S. tripod, bracket, or table speci- should refer all servicing to the Symetrix factory. fied by the manufacturer, or Customers outside the U.S. should refer all sold with the apparatus. When servicing to an authorized Symetrix distributor.
  • Page 4 Connect a Mic or Line level source to the appropriate parts inside the chassis. Refer all service to input connector on the rear of the 528E. Be sure to set qualified service personnel or to the factory. the Mic / Line switch to the appropriate position and be...

  • Page 5: Compressor Settings

    A bit of MID EQ will help make voices cut through and seem You can now power on the 528E and it should pass louder. The HIGH EQ can add brightness and intimacy.

  • Page 6: Front And Rear Panel Overview

    User’s Guide: 528E Voice Processor Front and Rear Panel Overview Mic Preamp MIC/LINE Selects between the Mic input (switch in) and Line input (switch out). -15 PAD Inserts 15 dB pad for strong mic signals. MIC GAIN(dB) Sets the gain of the mic preamp for best compromise between signal-to-noise ratio and headroom.

  • Page 7: Output Section

    VOICE SYMMETRY Inserts speech waveform asymmetry correction into the signal path. OUTPUT LED Indicates the peak output level of the 528E relative to the balanced output. The 0 VU LED on the display corresponds to +4 dBu at the balanced output.
  • Page 8 OUTPUT TRS phone jack (wired unbalanced). This is the output of the de-esser. Inserting a connector into this jack does not inter- rupt signal flow to the 528E’s expander / compressor. INPUT TRS phone jack (wired unbalanced). This is the input to the expander / compressor.

  • Page 9: Voice Processing Tutorial

    Strictly speaking, the terms compressor and In the case of the 528E, noise is referred to the limiter refer to two different devices. Oftentimes input, and stated as equivalent input noise (EIN). The...
  • Page 10 DC voltage. That part of the circuit is called a voltage noise ratio (to keep the signals 60 dB above the noise controlled amplifier, or VCA. Inside the 528E a separate floor), the dynamic range of signals stored on the analog...
  • Page 11 The lower limit restriction of a system is the noise operator to determine which frequencies are controlled, floor, which is usually well below the 528E’s lowest and how much those frequencies are actually attenuated. expander threshold (-50 dBu). It’s important to keep The 528E’s de-esser controls are frequency, which is...
  • Page 12 Harvey Fletcher (of The parametric EQ in the 528E provides both Fletcher-Munson fame) charted the sensitivity of the ear creative and corrective frequency shaping - it can...
  • Page 13 The following paragraphs give some general singers are particularly favored with 5 kHz sounds, women hints and precautions for using the 528E’s parametric less so. In popular music, this range shifts downward some- equalizer (or any other equalizer, for that matter).
  • Page 14 This kind of boost reduces headroom boost control for the appropriate amount of change, by 12 dB in every circuit from the 528E’s own line and readjust the bandwidth control if necessary. driver to the last device in the signal chain (transmitter, tape machine, or what have you).
  • Page 15 ® Voice Processing Tutorial... continued Range Description (women) Range Description (men) 100-250 Hz Fullness 75-200 Hz “Balls”, rumble, heaviness 250-400 Hz Bassiness, bigness 200-300 Hz Bassiness, bigness 400-600 Hz Warmth 400-600 Hz Chesty 600 Hz-1 kHz Volume 600 Hz-1 kHz Volume 2 kHz-4 kHz Clarity...
  • Page 16 User’s Guide: 528E Voice Processor Voice Processing Tutorial... continued 6408 216th St. SW | Mountlake Terrace, WA 98043 | USA | Tel: +1 (425) 778.7728 | Fax: +1 (425) 778.7727 ® Page...

  • Page 17: Using The 528E

    The send jack does not break the signal flow. Block Diagram The output level of the 528E can be set to either Please take a moment and take note of the following: line level or mic level. The switch for this function 7 The equalizer and de-esser are hard-wire is internal to the unit.

  • Page 18: Level Setting

    The Clip LED in the mic input section of the 528E For best results, the 528E should replace the mic actually monitors the output of the Mic-Line switch. If preamp in your console or recording chain.
  • Page 19 ® Using the 528E... continued Using the 528E as a Channel Insert Device The 528E can also be used as a channel- insert device with your console. Use the 528E’s line input and line output as shown below. +48V BYPASS...

  • Page 20: Gain Setting

    You may wish to change the sequence of processing set the Mic Gain control so that the Output Level display within the 528E to allow the signal processors to work on indicates levels in the -10 to 0 VU range. The Clip LED the input signal in a particular way (your way).

  • Page 21: Downward Expander

    While we make no level. Used in this manner, the compressor’s action promise that the 528E will sound the same, these is generally inaudible. Compressors can also be settings may be a good starting point if one of these used creatively, to make a source sound louder equalizers is within your frame of reference.
  • Page 22 (especially AM broadcast), this wastes transmitter the VCA what to do. The 528E’s sidechain routes power because the asymmetrical waveforms do not through a rear panel TRS jack that allows the utilize the full power of the modulator.

  • Page 23: Broadcast Applications

    This allows access to the individual sections of expander eliminates noise and adds “punch.” the 528E, provides for easy use of the sidechain, and The expander may be used without the compressor to allows the processing order to be changed at will (to remove background noise.
  • Page 24 When the 528E’s expander is used to shut out with the microphone(s) and speaker(s) in place as unwanted sounds, any signal that exceeds threshold they will normally be used, then follow the sequence will trigger the expander.
  • Page 25 Careful setting of the two threshold controls mix control to set the direct/effects signal mix. tells the 528E how and when to adjust the gain. Vocal Processing - Recording and Reinforce- Stage monitors can be made much “tighter” with com-...

  • Page 26: Technical Tutorial

    This section discusses a multitude of things, all Signal level is very important. Mismatch causes either related to getting signals in and out of the 528E. loss of headroom or loss of signal-to-noise ratio. Thus, microphone inputs should only see signals originating...

  • Page 27: Polarity Convention

    HAM radio transceiver’s unbalanced input. uses the 528E this way, then the polarity convention is The 528E has a level of -2 dBu (-10 dBV) at it’s unbal- unimportant. If your system is both balanced and unbal- anced output which translates to 0.615 volts RMS.

  • Page 28: Further Information

    (dynamics, ribbons, etc.). If your microphone’s data sheet says that it is phantom powered, the 528E can power it. Another remote powering system exists called A-B powering, modulation lead powering, or T system.

  • Page 29: Wiring Reference

    IMPORTANT NOTICE The wiring diagrams on these pages are included for information purposes only. Symetrix can not anticipate every connector type on non-Symetrix prod- ucts. It is the user’s responsibility to determine what connection is needed.
  • Page 30 User’s Guide: 528E Voice Processor Wiring Reference ... continued Unbalanced Connections: In this example, the unbalanced connector is sending signal to a bal- anced connector. When wiring this connection, use a shielded twisted Unbalanced out to balanced in pair cable. The balanced side wires the same as a standard, balanced connection.

  • Page 31: Troubleshooting Chart

    Check gain settings on upstream equipment. Is the input signal already noisy? The system gain structure should be such that the 528E operates at or near unity. Is the 528E set for mic-level output, driving a line-level input, with the 528E’s gain set fairly high and upstream...

  • Page 32: Specifications

    User’s Guide: 528E Voice Processor Specifications Inputs Overall Performance Data Controls and Switches Frequency Response Mic Gain, Phantom Power, Mic/Line 20 Hz to 20 kHz Mic and Line Input Connectors (+0, -0.5 dB), EQ cut, XLR-female (2) compressor out, Clip LED...

  • Page 33: Architects And Engineers Specifications

    Hz or 230 VAC nominal (207 to 253 VAC ), 50 Hz. (-30 dBm to 0 dBm), and a bypass switch. The unit shall be a Symetrix Incorpo- There shall be a three-band parametric equalizer. Each rated model 528E Voice Processor.

  • Page 34: Declaration Of Conformity

    User’s Guide: 528E Voice Processor Declaration of Conformity We, Symetrix Incorporated, 6408 216th St. SW, Mountlake Terrace, Washington, USA, declare under our sole responsibility that the product: 528E Voice Processor to which this declaration relates, is in conformity with the following standards:...

  • Page 35: Warranty And Service

    4. Write the RA number on the outside of the box. With respect to products purchased by consumers for personal, family, 5. Ship the unit to Symetrix, freight prepaid. We do not accept freight collect or household use, Symetrix expressly disclaims all implied warran- shipments.

  • Page 36: Appendix A: Level Output Switch

    WARNING: Lethal voltages are present inside the chassis. Perform all service work with The 528E ships from Symetrix with the XLR output configured for a line level output. If you must have a the unit disconnected from all AC power.
  • Page 37 ® www.SymetrixAudio.com Page...
  • Page 38 User’s Guide: 528E Voice Processor 6408 216th St. SW | Mountlake Terrace, WA 98043 | USA | Tel: +1 (425) 778.7728 | Fax: +1 (425) 778.7727 ® Page...
  • Page 39 ® www.SymetrixAudio.com Page...
  • Page 40 528E Voice Processor User’s Guide © 2008 Symetrix, Inc. All rights reserved. Printed in the United States of America. The information in this document 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, perfor- mance, or use of this material.

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