GB
to the speaker terminals, being careful not to leaveA note on overload protection.
any loose strands of wire that might touch the wrongBecause NAD amplifiers sound so clean and musi-
terminal and create a partial short-circuit. Then movecal when driven beyond their nominal power ratings
the speakers to their intended locations. and when used to drive low-impedance loudspeak-
If the speakers cannot easily be set face-to-face,ers, you may be tempted to stress your amplifier
phasing must rely on the Opolarity� of the connectingbeyond its design capacity. It can safely and cleanly
wires. Note that the SPEAKERS terminals on thedrive complex speaker impedances with wide-range
amplifier are color coded: in each channel the redmusical signals whose peak level is 40 watts or more,
terminal has positive O+� polarity and the black termi-but it may overheat if called upon to deliver high
nal is negative O-�. The terminals at the rear of thepower CONTINUOUSLY into a low impedance.
speakers are also marked for polarity, either via redThus you may play music at volume levels that
and black connectors or by labels: O+�, 1, or 8 ohmscause the brief transient peaks and climaxes in music
for positive, O-�, 0, or G for negative. As a generalto exceed the amplifierOs rated power by a consider-
rule the positive (red) terminal on the amplifier shouldable margin. But if you overdrive the amplifier contin-
be connected to the positive terminal of the speaker,uously rather than only on peaks, the output transis-
in each channel. tors may overheat.
To facilitate this, the two conductors comprising theThis is particularly likely if you try to drive two pairs
speaker wire in each channel are different, either inof speakers, or speakers having a very low imped-
the color of the wire itself (copper vs. silver) or in theance, at high volume levels. If the amplifier stops
presence of a small ridge or rib pattern on the insula-playing and the OProtection� indicator glows red,
tion of one conductor. Use this pattern to establishswitch off the power for a few minutes and allow the
consistent wiring to both speakers of a stereo pair.output stage to cool. If overheating was the fault, the
Thus if you connect the copper colored wire (oramplifier will operate normally when it is turned back
ribbed insulation) to the red amplifier terminal in theon. But severe abuse of this type may cause internal
Left channel, do the same in the Right channel. Atfuses to blow to protect the amplifier. If the amplifier
the other end of the wire, if you connect the copperstops playing and the green Power LED ceases to
colored wire (or the ribbed insulation) to the red orglow, return the amplifier to a NAD dealer for service.
positive terminal on the left-channel speaker, do the
same at the right-channel speaker.
IN CASE OF DIFFICULTY: A TROUBLE-SHOOTING GUIDE
SYMPTOMPOSSIBLE CAUSE
No sound.Power not turned on.
AC line cord unplugged, or plugged into dead outlet. (To check the
AC outlet, plug in an electric lamp.)
Tuner selected but turned off or tuned to a blank frequency between
stations.
Inoperative input selected (e.g. CD input selected with no CD
playing).
Tape Monitor engaged with no tape playing.
Internal fuses blown; return amplifier to dealer for service.
No sound in one channelVolume control for one of the channels is turned down. Check the
concentric volume control and ensure that both left and right are at
an equal level.
Loudspeaker connecting wire pulled loose. (Check all connections,
both at the speakers and at the amplifier.)
Connecting cable pulled loose or making poor contact in socket.
Rotate plugs in jacks to restore contact.
Short-circuit in a defective connecting cable. Wiggle all cables,
especially where they enter plugs.
Loud buzz and hum.Dirty contact in a switch. Exercise all front-panel switches to
restore clean wiping contact.
Connnecting cable pulled partially out of its jack.
Defective connecting cable.
Hum in tape playbackTape deck located too close to amplifier (directly above or below).
Tape deck located too close to television set.
Plugs making poor contact in jacks.
Weak bass, diffuse stereo imagingSpeakers wired out of phase. Swap connections at the back of
ONE speaker.
NA D
7 |
ACEC
