dbx 786 Owner's Manual
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dbx 786 Owner's Manual

Precision mic preamp
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786
Precision
Mic Preamp
Owner's Manual

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  • Page 1 ¨ Precision Mic Preamp Owner’s Manual...
  • Page 2 LIVE BROWN BLACK NEUTRAL BLUE WHITE European Contact: Your Local dbx Sales and Service Office or EARTH GND GREEN/YEL GREEN International Sales Office 68 Sheila Lane WARNING: If the ground is defeated, certain fault conditions in the unit or in the...

  • Page 3: Table Of Contents

    contents Manual Introduction ............About Mic Preamps .

  • Page 4: Introduction

    We wanted to create a pristine mic pre that would carefully reveal the very subtle nuances of any source device. To that end the 786 uses premium parts and as short a signal path as possible to colorlessly amplify a signal to useable levels.

  • Page 5: Understanding Console Signal Path

    Introduction Understanding Console Signal Path Recording and PA consoles operate at a nominal level of +4dBu, while microphones operate at a level of typically about -50dBu. Microphone signals must be amplified to the appropriate level for a console to process it properly. If a signal is not raised to the appropriate level, the signal will be “masked” by the console’s internal noise, especially when one tries to increase the level of a low signal using the con- sole fader or gain knob.

  • Page 6: Connection To Your System

    NOTE: If you are using a mic with a separate power supply, such as a tube microphone, make sure that you are not sending +48V phantom power from the 786 to the mic. Use the +48V Phantom Power switch on the 786 for all other microphones which require phantom power.
  • Page 7 786 is the dbx 160SL Stereo Compressor. Also, when recording with this method, remember that desired gain changes to the recorder can only be made via the GAIN controls of the 786. While this is much less convenient, it is often desirable to go directly to tape, bypassing all console electronics in favor of a pristine sig- nal.

  • Page 8: Operating Controls

    Gain Control Use the Gain control to adjust the output level of the 786. Note that the Gain control is used as a “coarse” adjustment, ranging from +15dB to +65dB of gain, in 5dB increments. The Gain control is not a “pot”, or in other words, the signal does not go through this control.
  • Page 9 Fine control stage, and the output of the EQ stage. VU Meter The VU Meter is a custom dbx meter and monitors the output signal of the 786. It is calibrated at 0VU=+4dBu. +48V Phantom Power Switch and LED This switch activates phantom power for condenser microphones on pins 2 and 3 of the XLR mic input.

  • Page 10: Rear Panel Description

    The Signal Ground binding post allows easy access to the signal ground system of the 786 without having to remove the cover of the 786 and locate a good place to take the signal ground out of the box.
  • Page 11 1/4 Inch Anchor Bolt We have provided a 1/4” anchor bolt on the rear panel of the 786 to aid in securing the unit in your rack. Since the 786 is a heavy unit, we recommend securing the 786 to a rear rack rail to avoid unnec- essary stress on the front panel and front rack rails of your rack.

  • Page 12: Technical Support/Factory Service

    Output Option Panel This panel is removed when an output option card is installed in your 786. Connecting a custom designed digital output module in the option port provides full 24-bit AES/EBU and S/PDIF output capa- bilities for the 786.

  • Page 13: Warranty

    Proof-of-purchase is considered to be the burden of the con- sumer. 2. dbx warrants this product, when bought and used solely within the U.S., to be free from defects in materials and workmanship under normal use and service.
  • Page 14 Green LED lights when 20 dB pad is engaged. Ø Invert: Yellow LED lights when pins 2 and 3 of the input XLR are reversed. Power: Blue LED lights to indicate the 786 is powered. OPTIONS Digital output module: Contact dbx for further details.

  • Page 15: Block Diagram

    diagram Block...
  • Page 16 ¨ A Harman International Company 8760 South Sandy Pkwy. Sandy, Utah 84070 Phone: (801) 568-7660 Fax: (801) 568-7662 IntÕl Fax: (603) 672-4246 Questions or comments? E¥mail us at: customer@dbxpro.com or visit our World Wide Web home page at: www.dbxpro.com 18-0531-A 1/19/98...

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