Harman Kardon 75+ - Operating Procedures and Controls; Speaker Phasing; Rear Panel Controls Overview; Front Panel Controls Overview

SPEAKER PHASING
For
maximum
enjoyment
of
multichannel
sound,
it
is
important
to
have
the
four
speaker
systems
in
phase.
The
phase
relationship
must
be
correct,
not
only
between
the
front
left
and
right
speaker
systems,
the
back
left
and
right
speaker
systems,
but
also
between
the
front
and
back
channels.
When connecting each speaker system to the receiver, be certain to main-
tain plus and minus polarities.
If your speakers do not have a plus/minus polarity identification, phasing
can be accomplished by the following procedure:
1. After connecting your speakers, place the receiver in the MONO mode of
operation and the SOUND FIELD BALANCE control to the exact top center
position.
2.
Play
a
record,
tape
or
FM
broadcast
which
has
a
single
speaking
or
singing
voice,
or a
solo
instrument.
3.
The
voice
or
instrument
should
appear
to
be
emerging
from
an
area
some-
where
in
the
center
of
the
two
speakers.
If
the
voice
seems
to
come
from
both
speakers
independently,
the
speakers
are
out
of
phase.
4. |f you determine that your speakers are out of phase, merely disconnect
the leads from only one of the speakers and reverse them. Your stereo system
will now be in phase.
This completes the phasing of a pair of speakers for stereo operation. It
should be noted that it is not necessary to match the impedance of the speakers
to the receiver since the 75+ is a solid state instrument and can accommodate
all speakers ranging in impedance from 4 to 16 ohms without special trans-
formers.
Repeat this process for all additional pairs of speakers in your system.
OPERATING PROCEDURE
Every control on this receiver serves a specific and useful function and
is important for the proper operation of your stereo or 4-Channel system.
Read this section carefully so you can take full advantage of all the per-
formance capabilities of this receiver.
SWITCHES AND CONTROLS — REAR PANEL
STEREO/4-CH SWITCH
The
75+
receiver
is
shipped
with
the
STEREO/4-CH
switch
in
the
4-CH
mode.
A
special
safety
latch
is
fitted
next
to
the
switch
to
prevent
throwing
the
switch
accidentally
while
the
receiver
is
turned
on.
If you plan to use the 75+ as a DOUBLE-POWER STEREO receiver, first
turn
off
the
unit,
remove
the
safety
latch
and
throw
the
STEREO/4-CH
switch
to
STEREO.
NOTE:
After
changing
position
of
this
switch
ALWAYS
replace
the
safety latch.
The two front channels now have the capability of delivering double power
to your speakers.
NOTE: WHEN THE STEREO/4-CH SWITCH iS IN THE STEREO POSITION THE
BACK SPEAKERS ARE INOPERATIVE. IF YOU WISH TO USE THE RECEIVER
TO POWER ANY BACK SPEAKERS, FIRST TURN OFF THE RECEIVER.
REMOVE THE LATCH AND THROW THE STEREO/4-CH SWITCH TO
4-CH, REPLACE THE PROTECTIVE LATCH.
STEREO THRESHOLD CONTROL
This
rear
panel
control
can
be
adjusted
to
determine
the
number
of
stereo
stations
the
tuner
will
reproduce
in
the
STEREO
FM
position
of
the
Function
Switch.
In the full counterclockwise position, the automatic switching circuits have
maximum
sensitivity
and
all
stereo
stations
within
the
range
of
the
tuner
will
be
reproduced.
However,
due
to
weak
signals
(or
their
distance
from
your
an-
tenna) some stations will contain noise levels which degrade performance when
reproduced in stereo. In order to reproduce these stations monophonically
(when in the STEREO FM position of the Function Switch), rotate the STEREO
THRESHOLD control clockwise until only good quality stereo stations are
reproduced.
MUTING THRESHOLD CONTROL
This rear panel control adjusts the level at which muting action will take
place. Minimum muting action occurs in the full counterclockwise position.
Maximum muting is achieved in the full clockwise position.
The full clockwise position will also eliminate stations with poor trans-
mission quality. The control should be adjusted to the point where you receive
only those stations which meet your standards of broadcast quality.
SWITCHES AND CONTROLS — FRONT PANEL
POWER SWITCH
The POWER switch performs the function as its name denotes. lt supplies
power to the receiver. When the pushbutton is depressed to turn the set ON
the power light will illuminate.