Harman Kardon HK 990 Owner's Manual page 6

Connections
Connecting Other Components
1. Make sure your amplifier and other
components are turned off.
2. Connect each component's output/Play
jacks to the corresponding Input jacks on the
back of your amplifier and, if available, the
component's Input/Record jacks to the output
jacks of the HK 990. Use the white, black or
gray plugs to connect left channel jacks; use
the red plugs for Right channel jacks.
Wired Remote Control
To control your amplifier with an external infra-
red remote sensor, connect the wire from the
remote sensor to the ReMoTe In jack on the
back panel. or, if another stereo component has
a built-in infrared remote sensor and a Remote
output jack, it may be possible to connect this
jack to the ReMoTe In jack of your amplifier. all
Harman Kardon products with »Remote In« and
»Remote out« jacks are com pa tible with one
another, except for the Citation 22, 24 and 25.
other manu fac turers' remote sensors and com-
ponents may not be compatible, but it will not
hurt to experiment. a second wire may be used
to connect your amplifier's ReMoTe oUT jack to
the Remote Input of another stereo component.
Continue this process to include additional
components (if compatible).
Connecting Speakers
1. for best performance, use high quality speaker
cables. However, ordinary copper wire can be
used if the gauge meets the following require-
ments:
Wire Min.
Length Diameter
Up to 2.5 meter 1 mm
Up to 4 meter 1.25 mm
Up to 6 meter 1.6 mm
above 6 meter 2-2.5 mm
2. avoid rolling excess wire with or near signal
interconnects.
6
ConneCTIons
IMPORTANT: When connecting two pairs of
speakers, determine the impedance of each pair
by looking on the back of the speakers, in your
owner's manual, or by contacting your dealer or
manufacturer.
You can listen to two pairs of speakers at
the same time ONLY if the impedance of
EACH speaker is NOT LESS THAN 8 Ohms.
WARNING: Do not play sets of speakers
simultaneously except as recommended above.
amplifier may overheat.
AC Power
Plug the cord into a 230 VaC wall socket.
Power indicator will light up to indicate power
on. To completely disconnect the power input,
the main plug must be disconnected from the
mains.