Table of Contents
Advertisement
——-LOUDBNESS
SWITCH
Push this switch to obtain a more natural frequency con-
tour at quiet listening levels. The human ear has different
frequency response characteristics at high and low volume
levels, and the loudness circuit automatically compensates
for this deficiency by boosting the bass range when the
volume is low.
The loudness circuit operates when the switch is pushed
in, Function
of the loudness circuit is linked
to the
VOLUME
and LEVEL
SET controls,
|
LEVELISET ab Osea
Loudness circuit functions at
;
volume settings from MIN to
|
about '11 0'clock."
LEVEL SET at-15dB ...
Loudness circuit functions at
volume settings from MIN to
about "1 o'clock."
. Loudness circuit functions at
any position of the volume
control.
LEVEL SET at-30dB..
FUNCTION SELECTOR
Selects the program source to be played.
PHONO 1...
Turntable connected to PHONO 1 inputs.
PHONO 2 ... Turntable connected to PHONO 2 inputs.
TUNER
....
Radio reception with tuner connected to
TUNER inputs.
AUX1
..... Program source {cartridge tape player etc.)
connected to AUX 1 inputs.
AUX2
.....
Program source (TV sound, second tuner,
3
etc.) connected to AUX 2 inputs.
MIC
......
Microphones connected to MIC inputs on
|
rear panel,
MODE
SWITCH
Selects stereophonic and monophonic listening modes.
| STEREO NORM...
Normal stereophonic reproduction.
a
STEREO REV ....
Stereophonic reproduction with re-
versed channels: left input signal to
right speaker, right inp signal to
left speaker.
|
MONO L+R
.. Monophonic
reproduction,
Mixed
left-plus-right signal to both speak-
ers.
MONO L .......
Left input signal to both speakers.
:
MONO
R
. Right input signal to both speakers.
THE TWIN TONE CONTROLS
|
Model SA-8100 has one pair of tone control knobs for the
bass range, another pair for the treble range.
The larger BASS control knob permits bass response to be
adjusted by +10dB at 100Hz. After passing through this
control circuit, the signal can be adjusted again at 50Hz,
by +5dB, with the smaller control knob.
Similarly, the larger TREBLE control knob adjusts treble
response at 10kHz by +10dB. The signal can be further
adjusted at 20kHz by +5dB. Fig.6(A) shows the obtain-
able frequency response curves when both controls are
used together. If the larger knobs are left at "0" and only
the smaller knobs used, these function as tone controls
with turnover frequencies at 80Hz and 12kHz, respec-
tively. Conversely, if both small controls are left an "0"
and only the large knobs used, these act as tone controls
with turnover frequencies at 400Hz and 2.5kHz. Fig.6(B)
illustrates these uses.
NOTE:
The numbers on the panel (50Hz, 100Hz, 10kHz and 20kHz denote the
frequencies at which the tone controls will show maximum effectiveness,
ie. maximum boost or attenuation.
"Turnover frequency," on the other hand, denotes the pone at which
the control will produce a boost or attenuation of 3dB.
RESPONSE
iw de
>
RESPONSE
IM dE OH
C0Hs
= 400rz
ZSkee
TAxbx
FREQUENCY IN Hz
FREQUENCY IN Hz
Fig. G
THE LEVEL SET CONTROL
On model SA-8100, there is an outer ring around the
volume control knob. With this LEVEL SET control, am-
_Plifier output can be reduced by 30dB or 15dB. This
gives several advantages and new possibilities:
@ When an amplifier as powerful as the SA-8100 is used.
for listening at quiet sound levels, the volume control
has to be turned down almost to MIN, and fine adjust-
ments within the soft range are difficult, If you reduce
total amp power by 15 or 30dB with the level set con-
trol, the volume control will permit easier and finer
adjustments in the remaining power range.
e Limiting of the power output also protects speakers,
especially those of small input handling ability, from
accidental damage that might occur when you turn up
the volume
to maximum
by mistake.
With small
speakers, it is advisable
to leave the LEVEL
SET
contro] at -15dB or -35dB at all times.
Advertisement
Table of Contents
