NAD S200 Manual Del Usuario página 4

NOTES ON INSTALLATION
This unit may be installed on any level surface that is strong enough
to support its weight. Since its power transformer generates a
significant magnetic hum field, a turntable (especially one with a
moving-coil pick-up cartridge) or a TV should not be located adjacent
to the amplifier or directly above it.
The heat-sink fins make it awkward to lift the S200 by grasping the
left and right sides. You may find it more practical to place your
hands under the front and rear panels. Much of the amplifier's
weight is near the front panel.
CAUTION: The amplifier's weight must always rest on its bottom feet.
Never put the amplifier down on its rear panel, with its front panel
facing up. Doing so risks damage to the input/output connectors.
The amplifier generates a moderate amount of heat, requiring
internal ventilation. Do not permit the air outlet grille on the top
cover to be obstructed by papers or articles of clothing. If you want
to locate the amplifier on a carpeted floor, place a board under the
amplifier in order to prevent it from sinking into the carpet, blocking
the air inlets on its bottom.
CAUTION: To prevent a fire or shock hazard, do not permit liquid or
moisture to enter the amplifier. If liquid is accidentally spilled on it,
immediately shut off the power and unplug the AC Mains cable
from the wall outlet.
Do not open the amplifier or attempt to modify or repair it
yourself. Refer all servicing to a qualified technician.
REAR PANEL CONNECTIONS
GB
1. IEC AC MAINS (POWER) INPUT
The NAD S200 comes supplied with a separate AC Mains cable.
Before connecting the cable to a live wall socket ensure that it is
firmly connected to the S200's AC Mains input socket first. Always
disconnect the AC Mains cable plug from the live wall socket first,
before disconnecting the cable from the S200 Mains input socket.
Plug the AC Mains cable into a live wall socket. If you must use an
extension cord, select a heavy-duty cord of the type used for large
electrical appliances.
Do not connect the amplifier's Mains cable to the accessory AC outlets
on a preamplifier. Such convenience outlets are not designed to supply
the high power levels, up to 800 watts, that the S200 requires. If you
wish to switch your entire audio system on and off at once, plug both
the S200 and your preamplifier into a "power strip" containing several
grounded AC outlets and a high-current on/off switch.
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NAD S200 Stereo Power Amplifier
Voltage conversion. A notice printed on the rear indicates the AC
power-line voltage that the amplifier requires. However, every model
S200 amplifier has a "universal" power supply that can be modified
easily for operation in other countries. If you wish to transport your
S200 to a nation that employs a different power-line voltage, an
authorised NAD dealer or service agency can convert it for such use.
2. SPEAKERS
This amplifier is equipped with special high-current binding post
speaker terminals to handle the highest peak power levels that may
occur in the "bridged" mode or with low-impedance speakers. At
moments when the amplifier is producing maximum power, voltages
of nearly 100 V may be present on the speaker terminals, so the
terminals are protected by transparent plastic covers.
To connect loudspeaker cables, first switch off the amplifier's power.
If you are connecting a pair of speakers for normal stereo operation,
be sure that the bridging switch is set to OFF (STEREO).
For best stereo imaging, the left and right speakers should be located
at equal distances from your chair. To minimise the effect of speaker
cables on the sound, locate the amplifier near the speakers and use
short cables to connect the speakers. If your preamplifier is located at
the opposite end of the room near your chair, you will need a long
cable to connect it to the power amplifier. All NAD preamplifiers have
the low output impedance required to drive long connecting cables.
Connect the wires from your left channel speaker to the (L+) and (L-)
terminals on the rear panel of the S200, and connect the wires from
the right channel speaker to the (R+) and (R-) terminals. In each
channel, the red terminal is the positive (+) output, and the black
terminal is the negative (-) or "ground" terminal.
Use heavy duty (16-gauge/2 sq.mm or thicker) wire, especially with 4
ohm loudspeakers. Bare wires can be connected directly to the
binding post terminals. For a longer lasting and more corrosion
resistant connection, you may purchase speaker cables with gold
plated connectors (pin connectors or spade lugs), or you can install
such connectors on the wires yourself. Connections to each binding
post may be made in several ways as follows. (See Figure 1.)
1. Pin connectors. A pin connector is a slim metal shaft that is crimped
or soldered onto the end of a wire. The threaded shaft of each
binding post contains an opening that accepts pin connectors up
to 3mm in diameter. Unscrew the plastic bushing on each terminal
to expose the hole in the metal shaft. Insert the pin connector
through the hole, and turn the bushing clockwise until it is tight.
2. Spade lugs. Unscrew the plastic bushing, insert the U-shaped spade
lug into the oblong gap and tighten the bushing down on it.
3. Bare wires. Separate the two conductors of the cord (if they appear
as a pair), and strip off a half-inch (1cm) of insulation from each. In
each conductor, twist together the exposed wire strands. Unscrew
the plastic bushings for + and -, insert the bare wire through the
hole in the metal shaft, and tighten the plastic bushing until it
grasps the wire securely. Check to be sure that no loose strand of
wire is touching the chassis or an adjacent terminal. Re-tighten the
bushing after a week or so to make sure that any play that may
have developed is eliminated.