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INST ALLA Tl ON
VENTILATION
Although your new receiver rarely develops high heat, it is recommended
that you leave the back of the cabinet open. If this is not possible, provide
several large holes or slots as low and as high up in the cabinet back as
possible. As an alternative, holes may be provided in the sides, bottom or
top of the cabinet. Remember that really effective ventilation requires provision
for cool air to enter at the bottom and hot air to leave at the top. A minimum
clearance of two (2) inches should be allowed on each side and in the rear,
between the chassis and the cabinet, and three (3) inches are required above it.
Isolate any accessories which might interfere with ventilation. For example,
do not drape plastic or rubber covered interconnecting cables over the equip-
ment.
POWER REQUIREMENTS
Connect the AC line cord to any outlet furnishing 117 volts, 60 Hz AC
current. The voltage may vary between 105 and 125 volts. Two auxiliary AC
power outlets are provided on the rear panel of your receiver, one being live
at all times (unswitched) and the other being live only when the power switch
is on (switched). Any accessory equipment (tape recorder, phonograph record
player, etc.) may be connected to these receptacles. Only those connected to the
switched receptacle will be controlled by the POWER switch on the front panel.
FUSING
A fuse is a safety device used to protect the receiver against possible
damage due to overload or short circuits. The 100
+
receiver employs five
protective fuses. All five are located on the rear panel.
The AC fuse labeled 4A-3AG is used to protect the power supply of the
entire system. The other four fuses labeled 4A-3AG LEFT, RIGHT, FRONT and
BACK, protect the output stages of the receiver.
The output of your receiver has been designed to operate with a MAXI-
MUM of 5.0 amperes of current in each channel. Under certain conditions, it
is possible to draw more than 5.0 amperes through the output stage which
would, in turn, blow the speaker fuses. This could be caused by using multiple
speaker systems where the total impedance falls below 4 ohms. (See SPEAKER
IMPEDANCE).
In the event of fuse failure, replace ONLY with the same fuse type used.
NEVER replace with a fuse of a higher roting.
To
do so will NOT protect your
receiver and could result in severe damage to it which will not be covered under
the warranty policy.
SPEAKER PLACEMENT (See Fig. 1)
The speakers will be referred to as LEFT and RIGHT, FRONT and BACK.
Placement of the back speakers will vary with your room size, seating arrange-
ment and acoustics. At times, it may be advantageous to place the back
2
speakers in line with the listener, either aiming them at the listener, the rear
of the room or against the side wall. It has been acknowledged that omni-
directional speakers (i.e. Harman/Kardon HK50) serve well as back speakers
in a 4-CH setup because they do not beam the sound at the listener. This gives
the illusion of far greater airiness and comes closer to the sound at a live con-
cert. We have illustrated several ways of arranging the back speakers. Some
experimentation may be required before you obtain optimum sound dispersion
and total surround sound. If you listen predominantly to classical music it is
recommended to reflect the back speakers off the walls, or aim them away
from the listener. This will tend to soften the sound and create a more natural
ambience. If you listen predominantly to contemporary music it may be advan-
tageous to place the back speakers in the corners and beam them into the room.
CONNECTING THE SPEAKERS
Use any type of wire to connect your speakers to your receiver. However,
it should be pointed out that the heavier the wire, the lower the loss of power.
Ordinary lamp cord, or zip cord as it is sometimes called, is excellent for this
application since it can be dressed easily around the molding and it is usually
heavy enough to extend great lengths without an appreciable loss in power.
Do not drive tacks or staples through the center of the wire since this can result
in a short circuit which would either cut the volume level down considerably
or short out the sound completely. It is permissible to use approximately 50-60
feet of heavy gauge speaker connecting wire for each speaker without loss of
volume.
CONNECT YOUR SPEAKERS WITH CARE, AVOID SHORTS. DO NOT CON-
NECT THE SPEAKERS WITH THE POWER ON. WORK CAREFULLY TRIMMING
ALL LOOSE WIRES ON THE REAR OF THE SPEAKERS AND RECEIVER. THE RE-
CEIVER HAS BEEN DESIGNED TO PREVENT DAMAGE FROM MOMENTARY
ACCIDENTAL SHORTING. HOWEVER, REPETITIVE SHORTING CAN DAMAGE
THE OUTPUT DEVICES.
The 1 00
+
has provisions for two pairs of speaker systems for the front
channels, and another two pairs for the back. Any pair may be driven inde-
pendently or a combination of two pairs may be driven, as selected by the
MAIN and REMOTE Speaker Switcl)es. Connect them to the receiver as instructed
in the diagrams (Fig. 2 and Fig. 3), taking care not to confuse the FRONT and
BACK, LEFT and RIGHT channels, and the plus and minus polarities. Sufficient
care should be taken not to short circuit the plus and minus leads.
SPEAKER IMPEDANCE
Each speaker system connected to your 1 00
+
must possess an impedance
of from 4 to 16 ohms. Should you wish to drive two pairs of speaker systems
simultaneously, they should all have an impedance of 8 ohms or more.
It should be noted that it is not necessary to match the impedance of the
speakers to the receiver since the 100
+
is a solid state instrument and can
accommodate all speakers ranging in impedance from 4 to 16 ohms without
special transformers.
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