Table of Contents
Advertisement
Quick Links
Advertisement
Table of Contents
Summary of Contents for LA Audio Electronic C400
- Page 1 4 Channel Auto Compressor Operation Manual April 2002...
- 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 Program switch Threshold control Ratio control Auto-Manual switch Hard-Soft Knee switch Release control Gain control Gain Reduction meter 2.10 Link switch EXTERNAL CONNECTIONS Side Chain insert Input Output Level switch Power switch Power inlet INSTALLATION 10-11 Inspection and unpacking Phantom... -
Page 4: Overview 4
Side chain inserts Balanced Inputs-Outputs with +4dBu/10dBV switching The C400 is a professional 4 channel compressor that can be operated as 4 separate processors or linked as two independent 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 affect compression equally. -
Page 5: Description Of Controls
2.0 DESCRIPTION OF CONTROLS BYPASS switch Pressing BYPASS cancels compression 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. PROG. -
Page 6: Auto-Manual Switch
A RATIO of :1 effectively means that there is no increase in output level once the input signal has reached THRESHOLD reference i.e. limiting. The following diagrams shows the difference between HARD and SOFT knee compression at a number of different RATIOs. THRESHOLD in the diagrams is set to 0dB. Fig 2.1: HARD knee compression Fig 2.2: SOFT knee compression AUTO-MAN switch... -
Page 7: Release Control
40mS and 4S. GAIN control The GAIN control on the C400 allows the output level from the compressor to be attenuated or amplified by up to 20dB. Generally used to compensate for level changes caused by the action of compression. -
Page 8: External Connections
3.0 EXTERNAL CONNECTIONS SIDECHAIN The Side chain TRS jack allows connection of an external processor such as an equaliser for frequency sensitive compression e.g. de-essing. This is an unbalanced insert with Ring wired as Send and tip wired as return. Please note: Plugging a jack into the side chain connector breaks the control signal path which must then be completed by the externally connected equipment. -
Page 9: Power Switch
POWER Mains power switch for C400 POWER INLET Standard IEC mains inlet for use with a detachable mains cable. See Section 3.4 for details of power requirements and fusing. Please note: The mains protection fuse is inside the unit, accessed by removing the top cover. -
Page 10: Installation
POWER REQUIREMENTS or as marked on the unit. Disconnect the mains supply before removing any cover. POWER REQUIREMENTS The C400 is factory configured for either 230V 50Hz ac or 115V 60Hz ac mains operation. Please refer to the following diagram which shows the transformer connections for 230V and 115V –... - 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 C400 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 www.laaudio.co.uk Page 14...