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R-SE7/DP-SE7/X-SE7 (En)
43
Preparation section Basic section Application section Knowledge sections
Play the music.
Switch on pure A.
Listening in Pure A Mode
Setting to pure A operation mode (pure A) is
recommended when listening with low volume
close to the set or late at night. Then you can
enjoy smooth high-quality sound with little
distortion.
Please use the normal mode to listen at higher
volumes.
1
2
Listening with High Sound Quality (Pure A)
Lights
÷ The volume indication changes to an indication matching
the low volume.
÷ When this is pressed again in pure A mode, normal mode
will be obtained. (The pure A indicator goes out.)
CAUTION
When pure A mode is selected, a certain amount of
power is used even when no music source is played
back, and the temperature of the amplifier section
will rise.
R-SE7
Adjust the volume.
3
R-SE7
What is Pure A?
The amplifier section amplifies the voltage and current of the input signal from the CD etc. and sends the output to the
speakers. In order to suppress the distortion occurring with this amplification, amplifiers with class A operation or class AB
operation always have current flowing through the circuits for current amplification. This is called the idling circuit. Especially
an amplifier with class A operation has a high idling current in comparison to an amplifier with class AB operation, which
is used by many units. As the result, class A operation has distortion suppressed to a minimum, and smooth playback with
high quality is possible. However, as a certain amount of power is consumed even when no music source is played, the
temperature of the amplifier section will become comparatively high. Thus a high-class amplifier with a large-capacity
power 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 can
be enjoyed easily, a class A operation mode for listening at low volume (pure A) has been provided. Please enjoy the pure
A sound quality when listening at low volume close to the set, late at night, etc.
Volume indication
pure
volume
control
pure
A
∞∞
down up
volume
control
pure
PURE A
VOL 7 2).