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13
Installation
PHASING
Stereo speakers must operate “in phase” with each other to produce a focused stereo blend and to
reinforce rather than cancel each other’s output at low frequencies. An in-phase connection is assured if
the red (positive) terminal on the amplifier is connected to the red (positive) terminal on the loudspeaker
in each channel. If your speakers are easily moved, their phasing can easily be checked. Make the
connections to both speakers, place the speakers face-to-face only a few inches apart, play some music,
and listen. Then swap the connection of the two wires at the back of ONE of the speakers, and listen again.
The connection that produces the fullest, most extended bass output is the correct one. Once you have
determined the correct phasing, connect the wires securely to the speaker terminals, being careful not to
leave any loose strands of wire that might touch the wrong terminal and create a partial short-circuit, then
move the speakers to their intended locations.
If the speakers cannot easily be placed face-to-face, then phasing must rely on the “polarity” of the
connecting wires. The speaker terminals on the amplifier are identified as red “+” and black “-” in each
channel. The terminals at the rear of the speakers are also marked for polarity, either via red and black
connectors or by labels: “+”, “1”, or “8 ohms” for positive, “-”, “0”, or “G” for negative. The red “+”
terminal on the amplifier should be connected to the red (positive) terminal of the speaker in each channel.
To facilitate this, the two conductors comprising the speaker wire in each channel are different, either in
the colour of the wire itself (copper vs. silver) or in the presence of a small ridge or rib-pattern on the
insulation of one conductor. Use this pattern to establish consistent wiring to both speakers of a stereo
pair. Thus if you connect the copper-coloured wire (or ribbed insulation) to the “+” amplifier terminal in
the Left channel, do the same in the Right channel. At the other end of the wire, if you connect the copper-
coloured wire (or the ribbed insulation) to the red (positive) terminal on the left channel speaker, do the
same at the right channel speaker.
NOTE
Safety organizations recommend that the speaker terminals of a very powerful amplifier should be
covered. Potentially dangerous voltages are present on these terminals when the amplifier is producing
maximum power. For your protection and in order to comply with these regulations, we have chosen
speaker terminals of the very highest quality for the NAD CI-series amplifier. These terminals are
covered by plastic bushings, which prevent the touching of metal parts.
ENGLISH
FRANÇAISDEUTSCHNEDERLANDSESPAÑOL
ITALIANO
PORTUGUÊS
SVENSKA
CI9120_9060 manual (GB) 12/12/02 9:09 pm Page 13