Summary of C400
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4 channel auto compressor operation manual april 2002.
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Page 2 this page has been left intentionally blank for your notes.
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Page 3 contents 1.0 overview 4 2.0 description of controls 5-7 2.1 bypass switch 2.2 program switch 2.3 threshold control 2.4 ratio control 2.5 auto-manual switch 2.6 hard-soft knee switch 2.7 release control 2.8 gain control 2.9 gain reduction meter 2.10 link switch 3.0 external connections 8-9 3.1...
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Page 4 1.0 overview main features: • 4 channels of auto compression • soft or hard knee compression slopes • fully variable threshold, ratio, release and gain • auto attack/release and program dependant attack with manual release modes • low frequency program filter • side chain inserts • balanced i...
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Page 5 2.0 description of controls 2.1 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. 2.2 p...
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Page 6 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...
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Page 7 hard knee compression provides tight control over signal levels above threshold and is useful for creative applications or where a large amount of gain reduction, such as limiting, is required. 2.7 release control release is only active in man (manual) mode (auto-man switch in) and adjusts th...
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Page 8 3.0 external connections 3.1 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 th...
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Page 9 3.5 power mains power switch for c400 3.6 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. Ensure that the un...
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Page 10 4.0 installation 4.1 inspection and unpacking the c400 has been carefully packed at our factory in a carton designed to withstand handling in transit. Should the unit appear to have been damaged in transit, notify your dealer immediately and do not discard any of the packing. The carton shou...
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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: g...
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Page 12 5.0 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 o...
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Page 13 6.0 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: signal to noise ratio: > 90db, +4dbu out, 22hz- ...
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Page 14 7.0 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.