Luxman 308 - Detailed Switches and Controls; Speaker Output and Power Management; Audio Tone and Equalization Features

Switches &
Controls
@ Speaker Selector Switch (SPEAKERS)
This amplifier offers convenient use of 2 speaker systems, Main
and Remote. You can choose independent or simultaneous driv-
ing of 1 or 2 systems as per the indication on the front panel.
When both Main and Remote speakers are used, make sure that
the overall impedance is not less than 4a.
At the OFF position, the speakers are disconnected from the
amplifier, and you can enjoy private listening by headphone.
@ Mains Switch (POWER)
Press alternately for ON or OFF.
@© Headphone Jack (PHONES)
Connection of a stereophonic headphone to this jack allows pri-
vate listening. Output signal is always available regardless of
the position of the Speaker Selector Switch (1). For private listen-
ing, however, set the Speaker Selector Switch at the OFF posi-
tion.
@ Bass Level Control (BASS)
A clockwise turn of the control] boosts the bass response, and a
counter-clockwise turn decreases and cuts the bass. This control
has a click-stopper with 11 points. It yields a flat frequency res-
ponse when set at the centre of the rotation angle. You can
choose a turnover (roll-off) frequency of 150Hz, 300Hz or
600Hz with the Selector Switch (5). The Bass Level Contro!} is
of dual concentric construction and permits separate control of
either the right or left channels: the outer axis is for the right
channel, and the inner axis is for the left channel. This contro!
usually controls both channels simultaneously, but you may
adjust either channel by holding one axis while turning the
other. The click-stoppers are only for the outer axis, i.e., the right
channel.
@ Bass Frequency Selector Switch
Bass turn-over (roll-off) frequencies can be selected with this
switch. When the desired frequency (150Hz, 300Hz or 600Hz)
is set by this switch, tone contro] starts to function at the selected
frequency. At the DEFEAT position, a flat frequency response is
obtained, regardless of the position of the Bass Level Control
(4).
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@ Treble Level Control (TREBLE)
A clockwise turn of this knob boosts the treble response, while
a counter-clockwise turn decreases the treble. This contro! is
of the same construction as that of the Bass Level Control, and
its operation corresponds to that described in (4).
@ Treble Frequency Selector Switch
Function wise, it is the same as the Bass Frequency Switch
described in (5).
@ Linear Equalizer (LINEAR EQUALIZER)
This is a new tone control which provides a tonal compensation
specifically intended for subtly augmenting regular tone controls.
With the control in its mid-position, flat frequency response is
achieved. When switched to either of 2 “up tilt’ positions, the
entire response curve is rotated so as to linearly increase treble
response while simultaneously decreasing bass response. Con-
versely, selection of a ‘‘down tilt” position rotates the response
curve In a clockwise direction and provides a gradual decrease of
treble and a simultaneous increase of bass. This equalizer is not
released even when the Tone Controls Switch (9) is set at the
“tone defeat’ position. For further details, refer to the Operation
of Linear Equalizer (Page 16).
© Tone Controls Switch
This switch releases the function of the tone controls (4 5, 6,
7 above) when set at the ‘tone defeat’ position. To operate
these controls, this switch must be set at the centre or NORMAL
position. It functions as a low booster at the “low boost” posi-
tion where bass frequencies below 70Hz are boosted at the rate
of 6 dB/oct. In case this amplifier is used as a component ampli-
fier of a 4-channel system, take care with the phase matching of
the speakers, since the phase of signals becomes reversed when
they pass through the tone controls (normal or low boost),
while remaining norma! at the ‘‘tone defeat” position. Refer to
the Operation of Low Booster and Connection of 4-CH DE-
CODER (Page 16).
@ Low Cut Filter (LOW CUT)
OFF at the centre position. When moved up to the 7OHz posi-
tion, a bass roll-off occurs at 70Hz at the rate of 6 dB/oct. When
moved down to 20Hz, the roll-off occurs at 20Hz. For further
details, refer to Low Cut Filter (Page 16).