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LA Audio G400 Operation Manual

4 channel frequency conscious noise gate
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4 Channel Frequency
Conscious Noise Gate
Operation Manual
June 2005

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Summary of Contents for LA Audio G400

  • Page 1 4 Channel Frequency Conscious Noise Gate Operation Manual June 2005...
  • Page 2 This page has been left intentionally blank for your notes Page 2...

  • Page 3: Table Of Contents

    CONTENTS OVERVIEW DESCRIPTION OF CONTROLS Bypass switch and led Listen switch Hi-Pass control Lo-Pass control Ext. Key led Threshold control Above-Below leds Attack switch Range switch 2.10 Release control 2.11 Link switch EXTERNAL CONNECTIONS Side Chain insert Input Output Level switch Power switch Power inlet INSTALLATION...
  • Page 4 • Balanced Inputs-Outputs with +4dBu/10dBV switching The G400 is a professional 4 channel noise gate that can be operated as 4 separate processors or linked as two independant stereo pairs. In Link mode, Channel 1 and 3 provide Master control and 'rms summing' is used to ensure that signals from both the linked channels operate the gate.

  • Page 5: Description Of Controls

    2.0 DESCRIPTION OF CONTROLS BYPASS switch Pressing BYPASS cancels gating by removing the side chain voltage from the voltage controlled amplifier (VCA). The Input-Output and level change circuitry remain in the signal path. The BYPASS led lights when the compressor is Bypassed. LISTEN switch This facility allows the side chain signal to be monitored at the channel output.

  • Page 6: Ext. Key Led

    THRESHOLD sets the reference level at which the gate will open and allow audio through to the output. Control range is -50dBu to +20dB. The side chain on the G400 has been designed with 'auto-level-sensing' and Hold circuitry to ensure that both fast transient and low frequency signals operate the gate without false triggering and/or chatter.

  • Page 7: Range Switch

    Channels 1 and 3 become the masters, the controls on channels 2 and 4 are disabled. The side chain circuitry on the G400 uses true rms summing to ensure that the signals in both the linked channels are used to control the gate.

  • Page 8: External Connections

    3.0 EXTERNAL CONNECTIONS SIDECHAIN The Side chain TRS jack allows connection of an external processor such as a parametric equaliser for more sophisticated frequency conscious gating applications. External key signals are often used for gated-reverb, rhythmic and bass enhancement effects. This is an unbalanced insert with Ring wired as Send and Tip wired as Return.

  • Page 9: Power Inlet

    The Side Chain insert operates at -2dBu in both +4dBu and -10dBV modes. POWER Mains power switch for G400 POWER INLET Standard IEC mains inlet for use with a detachable mains cable. See Section 3.4 for details of power requirements and fusing.

  • Page 10: Installation

    • Operator Manual (this book) OPERATING ENVIRONMENT The G400 is designed to operate between 0° C and 40° C (32-112° F) with relative humidity no more than 80%. Should the units be installed in an equipment rack, ensure that the ambient temperature conforms to these levels.
  • Page 11 Please note: If the fuse requires changing at any time please ensure the correct type is fitted. An incorrect fuse could cause damage to the unit and may constitute a fire hazard. The detachable IEC mains lead connections to the appliance are coloured in accordance with the following code: Green-and-Yellow Earth...
  • Page 12 WARRANTY Your LA Audio G400 has been manufactured to a high standard using quality components. If correctly installed and operated the unit should give years of problem free operation. However in the event of a defect in material or workmanship causing failure of the unit within 1 year of the date of original purchase we will agree to repair, or at our discretion replace, any defective item without charge for labour or parts.
  • Page 13 TECHNICAL SPECIFICATIONS ELECTRICAL Frequency response: 20Hz to 20kHz (+0, -0.5dB) Input Impedance: 20k balanced Maximum Input Level: +20dBu Input-Output Level: +4dBu or -10dBV Output Impedance: 100R balanced Max. Output Level: +20dBu THD: < 0.05% (1kHz, +4dBu) Signal to Noise Ratio: >...
  • Page 14 DIMENSIONS In keeping with our policy of continuous improvement LA Audio reserves the right to alter specifications without prior notice. Manufactured in the UK by LA Audio Web: www.laaudio.co.uk. Page 14...

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