Kenwood R-SG7 Instruction Manual

Also see for R-SG7: Service manual

Kenwood R-SG7 Instruction Manual Manual pdf 43 page image

R-SG7/DP-SG7/X-SG7 (EN)43Preparation sectionBasic sectionApplication sectionKnowledge sectionsPlay the music.Switch on pure A.Listening in Pure A ModeSetting to pure A operation mode (pure A) is rec-ommended when listening with low volumeclose to the set or late at night. Then you canenjoy smooth high-quality sound with little dis-tortion.Please use the normal mode to listen at highervolumes.12Listening with High Sound Quality (Pure A)Lights÷ The volume indication changes to an indication matchingthe low volume.÷ When this is pressed again in pure A mode, normal modewill be obtained. (The pure A indicator goes out.)CAUTIONWhen pure A mode is selected, a certain amount ofpower is used even when no music source is playedback, and the temperature of the amplifier sectionwill rise.R-SG7Adjust the volume.3R-SG7What is Pure A?The amplifier section amplifies the voltage and current of the input signal from the CD etc. and sends the output to thespeakers. In order to suppress the distortion occurring with this amplification, amplifiers with class A operation or class ABoperation always have current flowing through the circuits for current amplification. This is called the idling circuit. Especiallyan amplifier with class A operation has a high idling current in comparison to an amplifier with class AB operation, whichis used by many units. As the result, class A operation has distortion suppressed to a minimum, and smooth playback withhigh quality is possible. However, as a certain amount of power is consumed even when no music source is played, thetemperature of the amplifier section will become comparatively high. Thus a high-class amplifier with a large-capacitypower supply is required to enjoy the sound quality of class A operation.The amplifier of this unit normally operates in class AB operation, but as the high sound quality of class A operation canbe enjoyed easily, a class A operation mode for listening at low volume (pure A) has been provided. Please enjoy the pureA sound quality when listening at low volume close to the set, late at night, etc.Volume indicationpurevolumecontrolpure A∞ ∞down upvolumecontrolpureP U R E AV O L 7 2 ).