Sansui AU-70 - Switches and Controls Overview; Power Controls and Indicators; Audio Adjustment Controls

SWITCHES AND CONTROLS
CD POWER INDICATOR
T his lights up yvhen power is being sup-
plied. It remains on whi le the amplifier
is in oper ation.
@ HEADPHONE JACK
When you want to avoid disturbing others
or when you use the ampl ifier as a monitor,
co nnect h ead phon es to this jack. You
can still enjoy s tereophonic reprodu ction
through the h ea d phone s. For thi s pur-
pose, you can use a ny type of headphones
or earphones if its plug fits into the jack.
But use dynamic headphones designed for
stereophonic reproduction, if possible.
@ SPEAKER ( SPEAKER OFF)
When you use headphones with the head-
phone jack, set this switch to "OFF " to
cut off sound to the speakers . This feature
enables you to enjoy stereophonic repro-
duction without disturbing others.
@ PRESENCE
If the Tone Control al one is used for bass
com pensat ion, slightly higher frequencies
are compensated at the same time. To
avoid this, turn this switch "ON" _ This
sets the turnover at 150 cps, changing
speaker damping and frequency re s ponse
ch ara cteristics to compensate bass. As a
resu lt, all s ounds become impressive and
you can enJoy clear, m ag nifice nt bas s.
@ POWER
This switch is used f or connecting and
disconnecting the power supply. Push the
. button for poweL Pu sh it again to shut
it off_ The switch also activates and de -
activates the power - supp ly plug recept acles
on the back of the amplifieL
CD
HE"O PHON
®
POWER
®
@
@
ow ..
TER
- 11
® OUTPUT LEVEL METERS
Th e right and left meters indic ate the out:
put l eve ls of th e right and left sp eake rs,
re spectively.
Since output is s hown se par ate ly for each
c hannel , the met e rs provide easy balance
adjus tment. Besides, you ca n wat ch c hang es
in th e o utput of each channel dur i ng ope-
ration . Each meter can be set to any of
th e thr ee range s of 5, 10 and 25 watts by
means of
th e output- level meter s witch on
the back of the amplifieL Choose th e
a ppropriat e range according to th e output
YOU want. \ '-h en the "MODE " sw itch is set
io R (or L), t he meter for L (or R) does
not \york.
(J) LOUDNESS
\\ - hen so und \'olume is at a low level, you
ieel as if bass and treble are missing. In
such a case, turn this switch "ON " to
compensate bass and treble. Th is will
mak e you f ee l as if you were present at
an ac tual concert,
@ LOW FILTER (for eliminating
low-frequency
noise) .
Turn this 5w it ch "ON " to red uce phono "
motor and other unplea sa nt low-frequency
nOI ses.
® HIGH FILTER (for eliminat-
ing high-frequency noise)
Turn this sw it ch "ON " to red uce relatively
high-frequen cy noise, such as the sc ratch
from rec orel s made of poor mat erial or noise
du e to fluoresce nt lamp s in th e case of
th e tun er.
@) TONE DEFEAT
Turn this sw it ch " ON " to open the tone
co ntrol circuit s_ Then th e fre qu en cy re-
s pons e c ur\' e of the amp lifier wi ll be co me
perfectly flat.
,
1
® TAPE MONITOR
vVh en you mak e record in gs with a thr ee -
he ad tape record er, turn this sw itch "ON"
to use th e am pI ifi er as a mon itor. Then
th e s ounds rec ord ed on th e tape are re-
pro duced while yo u are reco rding. Keep
th is switch " ON " when you play the t ape
on the tap e .recorder.
Be s ure to k eep th e ~\\"itch "OFF" othe r-
wIse.
@ BALANCE
Th is knob is used to adjust the balan ce of
volume be tw ee n the right and left spea kers
for the best ste reoph on ic e ff ect. J\ , 1ake the
adjustment while watching th e o utput l eve l
met
ers and li s tening to the so und s of both
spea kers . \\Then the amplifier is adjusted
pr ope rly, yo u feel as if th e so und co mes
fr om a point midway between th e two
spea kers.
@ BLEND
Thi s knob permits continuous shift from
stereo phoni c to monaural reproduction .
Turn it co unter-clo c kwi se to brin g repro-
du ction closer to monaural ( R+L). For
co mp l ete mon aural re produ ction, turn it as
far co unter- c lo c kwi se as possible.
Th e so und s of the righ t and left sp ea kers
beco me sepa rated \"hen you turn th e knob
cl oc kwi se (R and L pe rform th eir respec tive
functions) . Th e best ster eop honic effect is
obtained when you turn it as far as possible_
@) BASS and @ TREBLE for L
Th ese control the tone of the left spea ker.
@ BASS and ® TREBLE for R
These control the ton e of th e right speaker.
@
®
@
-12 -
@) VOLUME
Thi s knob is used to co ntrol th e volume
of the tuner , rec ord s and tap es. Turn it
clockwise for louder reprodu ct ion. To
redu ce th e \'01 ume, turn co un ter-clockwise.
@ SELECTOR (input-selector)
TUNER: For receiving bro a dca sts through
the tuner.
PHONO: For playing reco rd s.
MlC: For us in g a mic roph one,
TAPE HEAD : For playing tapes on th e
t ape c1 eck (directly from the tape head).
AUX : For r epro du cing \'oice input or u si ng
the
MPX adaptor.
@ MODE (Stereophonic/
monaural switch)
Thi s s wit ch is used to shift from s ter eo-
phoni c · t6 mon a ur al re produ ction or vIce
versa .
STEREO: Set the switch at this po si tion
for
stereo reproduction. Signa ls f ed int o
A come
out of A's s peak er and tho se fed
into B come out of B 's sp ea ker.
STEREO- REV : Thi s position, too, is for
stereo reproclu ct ion. But signals fed into
A come out of B' s s peaker a nd tho se fed
into B come out of A's s peak er. Choose
this position when th e rig ht and l eft are
r e\'e rsed in r ep rodu ct ion.
L+ R: Signals fed into Land H. are bl e nd ed
into one (L + R) in the amplifier befor e
th ey come out se paratel y from Land R.
Signals f ed into A and 13 become A+B
in th e amplifier and come o ut of the
spea kers of A and 13 in the form of tb e
co mbined so und A+B.
R (Mon o R ): Signals fed into A come out
of A's and B 's sp ea kers. Use this pos i-
tion for reprodu cing mono broad casts and
tape s.
L (Mono L): Signals fed into B co me out
of A's and B's sp ea ker s.
Thi s position is rarel y u secl .