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True PRECISION 8 Operation Manual

8-channel precision microphone preamplifier
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PRECISION 8
8-CHANNEL PRECISION MICROPHONE PREAMPLIFIER with M/S decoding and Direct Inputs

OPERATION MANUAL

Version 1.2

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Summary of Contents for True PRECISION 8

  • Page 1: Operation Manual

    TRUE systems PRECISION 8 8-CHANNEL PRECISION MICROPHONE PREAMPLIFIER with M/S decoding and Direct Inputs OPERATION MANUAL Version 1.2...

  • Page 2: Safety And Operating Precautions

    If you have an extreme RF interference environment, please contact TRUE. Avoid mounting the unit in close proximity to devices that emit strong magnetic fields.

  • Page 3: Table Of Contents

    CONTENTS SAFETY and OPERATING PRECAUTIONS ........... INTRODUCTION ..................FEATURES ..................... UP-AND-RUNNING IN A HURRY ............INSTALLATION ..................OPERATION ................... Connections - Location and Description ........Controls - Location and Description ..........More About M/S Decoding ............Optional Level Indicator Modes ........... DESIGN APPROACH ................

  • Page 4: Introduction

    Dual output connections provide easy interconnection as well as the ability to act as a mic splitter. PRECISION 8 is ideal for location recording due to its compact, 1U rack size, 8- channel format, useful level metering and easy interconnect. The integral M/S...

  • Page 5: Up-And-Running In A Hurry

    • Set φ φ φ φ buttons as appropriate. • Adjust DI-1 or DI-2 Gain controls for adequate signal level as indicated on the Precision 8 level indicators or on the level indicators of the device to which it is connected.
  • Page 6 • +4 illuminates when the signal reaches normal operating level of +4 dBu. • OL illuminates when the signal level exceeds +26 dBu, which is 5 dB below the overload point for the Precision 8. • The PEAK-HOLD indicators (PK,-3,-6) activate when the output signal level exceeds the level set on the PEAK REFERENCE switch.

  • Page 7: Installation

    A Word About Cables..Most users of the PRECISION 8 have invested much time and money in their selection of microphones and preamplifiers. We recommend that you give some consideration to the microphone and output cables you select, as well.

  • Page 8: Operation

    OPERATION PRECISION 8 Connections - Location and Description AC Power Connection • 120V, 60 Hz AC power only. (consult factory for other options) • Always maintain an earth ground connection - DO NOT use isolators. • Use delayed 0.5A fuses. NEVER use a replacement fuse of higher value.

  • Page 9: Controls - Location And Description

    5 dB below actual overload. Depress RESET 10 to clear OL. Peak-Hold indicators. These are provided to help optimize level setting when the PRECISION 8 is remotely located from the device to which it is connected. The PK indicator activates (and holds) at the level selected on the PEAK REFERENCE selector 9 .
  • Page 10 OPERATION PRECISION 8 Operating level indicator. The +4 indicator activates when the output level reaches +4 dBu normal operating level. When the PEAK REFERENCE selector is set to the -10 dBV position, the operating level indicator activates at -10 dBV output level.

  • Page 11: More About M/S Decoding

    PRECISION 8 More About M/S Decoding: M/S (Mid-Side) decoding is a particularly creative feature of the Precision 8. While the M/S microphone technique has been around for many years, the opportunity to use it is frequently limited by the need for specialty microphones and/or decoders.

  • Page 12: Optional Level Indicator Modes

    RESET is depressed. This mode can be helpful in live sound and recording applications where the PRECISION 8 is remotely located from the device(s) to which it is connected. Jumpers inside the unit select this optional mode.

  • Page 13: Design Approach

    DESIGN APPROACH PRECISION 8 uses a high-voltage composite architecture with discrete matched PRECISION 8 transistors plus premium integrated circuits. It offers very low noise and distortion as well as high headroom. The totally balanced dual servo design eliminates nearly all capacitors in the audio path and is DC-coupled at the output. Many components are military grade and are hand-matched for optimum performance.

  • Page 14: Troubleshooting

    TROUBLESHOOTING PRECISION 8 No signal output. Main power switch • Check AC power source and is on, but green power LED is off. cord. • Check fuse (pull fuse drawer under power cord inlet) No signal output. Main power switch •...
  • Page 15 TROUBLESHOOTING PRECISION 8 Hum can be heard in the audio • Set ground lift switch to LIFT. program. • Check continuity of output cables (particularly shields). • Disconnect shields on one end of output cables. Set ground lift to the grounded position.
  • Page 16 Canare, etc.) and that the shield is properly connected. Avoid excessive length. • Make sure that earth ground connection is maintained via the AC power cord - DO NOT use an isolator. • Contact TRUE for optional extended RF filter modifi- cations.

  • Page 17: Warranty

    WARRANTY PRECISION 8 TRUE systems warrants that the PRECISION 8 will be free from defects in material and workmanship, when properly installed and used according to instructions in the Operation Manual, for a period of one year from the date of purchase.

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