Related Manuals for Rebis Audio RA402
Summary of Contents for Rebis Audio RA402
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Page 1: Table Of Contents
REBIS AUDIO RA402 PARAMETRIC EQUALISER OPERATORS MANUAL CONTENTS Page Introduction Installation Earthing Position Operation Feedback Prevention Maintenance Guarantee Shipping Specifications Circuit Description... -
Page 2: Introduction
INTRODUCTION The RA402 provides two four section equalisers in a standard 19"x 3.5" (482.6mm x 88.9mm) rack mounting unit. Each section has controls for centre frequency, bandwidth, equalisation and an In/Out switch. The frequency controls cover the entire audio spectrum from 20Hz to 18kHz in 4.5 octave ranges, giving 2.7 octave overlap between sections. -
Page 3: Earthing
If there are still any problems try disconnecting the output cable screen wires at the RA402 end and the input cable screen wires at the system end. In this case a separate cable should be run from 0 volts in one can- non to the system master earth point. -
Page 4: Operation
OPERATION How do you use a parametric equaliser? The answer could not be sim- pler, merely listen! This might sound obvious but only a parametric equaliser with its continuously variable control of all parameters allows you to zero in on exactly the sound you want. Try the unit out with programme material. -
Page 5: Feedback Prevention
FEEDBACK PREVENTION The RA402 can be utilised to prevent acoustic feedback in sound rein- forcement systems. Set all sections for full cut with narrow bandwidth and switch them out. Increase system gain until feedback just starts, se- lect the section which covers the band in which the frequency of oscilla- tion lies, switch the section in and sweep the frequency control until the oscillation stops. -
Page 6: Maintenance
MAINTENANCE A service manual containing circuit diagrams, board layouts and set up instructions is obtainable from Rebis Audio Ltd. Only properly qualified personnel should attempt repair of the RA402. WARNING: THIS UNIT CONTAINS PRINTED CIRCUIT MOUNTING HARDWARE CARRYING MAINS VOLTAGES. -
Page 7: Guarantee
GUARANTEE The RA402 parametric equaliser is guaranteed against defects in work- manship or components for a period of one year from date of purchase, this guarantee applying only to the original purchaser. Should a fault develop within this period the unit will be repaired with no charge for parts or labour, shipping costs being met by the owner. -
Page 8: Specifications
SPECIFICATION Input Gain controls: Continuously variable up to 20dBs of boost. Equalisation controls: Continuously variable boost or cut up to 21db. Bandwidth controls: Continuously variable from 5.5dB/octave to 36dB/octave. Peak Indicator: The LED will light and stay on for 100mS if the peak positive or negative level anywhere in the system exceeds +21dBm. -
Page 9: Circuit Description
CIRCUIT DECRIPTION The signal enters the unit via balanced input buffer IC1. The output from IC1 connects to the 'out' side of the EQ In/Out switch and the top of the input gain control. The input gain control passes signal to a non- inverting 20dB gain stage IC2 which feeds the first of four virtually identical equalisation sections. - Page 10 Circuit Description (cont.) R40 provides a small amount of negative feedback around IC6b to make the peak boost the same on both high and low Q settings. The EQ In/Out switch S3 passes signal to the input of the balanced output driver IC3.
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