Kenwood KAC-818 Instruction Manual

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Contents

8 EnglishSigma servo feed backThe sound reproduced through conventional amplifiers is distorted due to thecounterelectromotive force produced in the oscillating system of the speaker. Thecounterelectromotive force is particularly high with the woofer which requires a large drivemass.The sigma servo connection reduces distortion caused by the counterelectromotive forceby including the circuit up to the speaker terminals in the negative feedback loop. This makes itpossible to drive speakers with more fidelity to the input signals and create a sharp bass soundimage with few feeling of noise interference.The speaker cables and sigma servo cables should be distributed along the same paths.• The extension of the negative feedback loop to include the speaker terminals makes itnecessary to connect the sigma servo terminals correctly. Incorrect connection may result insound degradation or other malfunction. If sound is not reproduced normally, check theconnection of the sigma servo terminals, etc.• If the Sigma servo terminals are not connected, the sound may fluctuate or noise may occur.Be sure to connect the Sigma servo terminals correctly.• When connecting speakers in a parallel configuration, use speakers with an impedance of 4ohms or more. Connecting speakers with smaller impedance than 4 ohms will causemalfunction.• The rated input of the speakers connected to this unit should be no less than the maximumoutput of the amplifier. Otherwise malfunction may result.Be specially careful in this when connecting speakers in a parallel configuration.2CAUTIONNOTEnBasic sigma servo connection nSeries connectionMake this cable as short as possible.2CAUTIONnParallel connection (1)The speaker cables connected to this unitshould be thick enough to supply the currentcapacity of two speakers.2CAUTIONThis connection is possible only when thespeakers are identical and the speaker cablesare also of the same type and length.2CAUTIONnSimplified sigma servo connectionnParallel connection (2)In case any of the connection examples above cannot beused or if the speakers cannot be connected to thespeaker terminals, connect them to this unit as shown inthe figure.

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