· OWNER'S MANUAL
· MANUEL D'INSTALLATION
· MANUAL DEL USUARIO
· MANUALE DELLE ISTRUZIONI
· MANUAL DO PROPRIETÁRIO
REAR PANEL CONNECTIONS
WARNING:TO PREVENT FIRE OR ELECTRIC
SHOCK, DO NOT EXPOSE THIS APPLIANCE
TO RAIN OR MOISTURE
CAUTION: TO PREVENT ELECTRIC SHOCK DO
NOT USE THIS POLARISED PLUG WITH AN
EXTENSION CORD RECEPTACLE OR OTHER
OUTLET UNLESS THE BLADES CAN BE FULLY
INSERTED TO PREVENT BLADE EXPOSURE.
ATTENTION: POUR PREVENIR LES CHOCS ELEC-
TRIQUES NE PAS UTILISER CETTE FICHE
POLARISEE AVEC UN PROLONGATEUR, UNE
PRISE DE COURANT OU UNE AUTRE SORTIE DE
COURANT, SAUF SI LES LAMES PEUVENT ETRE
INSEREES A FOND SANS EN LAISSER AUCUNE
PARTIE A DECOUVERT.
The lightning flash with arrowhead, within an equilateral tri-
angle is intended to alert the user of the presence of unin-
sulated "dangerous voltage" within the product's enclo-
sure; that may be of sufficient magnitude to constitute a
risk of electric shock to persons.
The exclamation point within an equilateral triangle is intend-
ed to alert the user of the presence of important operating
and maintenance (servicing) instructions in the literature
accompanying the appliance
Note to CATV system installer: This reminder is provided
to call the CATV installer's attention to Article 820-40 of the
NEC , which provides guidelines for proper grounding and,
in particular, specifies that the cable should be connected
to the grounding system of the building, as close to the
point of cable entry as practical.
RISK OF ELECTRIC
SHOCK DO NOT OPEN
RISQUE DE CHOC ELECTRIQUE
NE PAS OUVRIR
CAUTION: TO REDUCE THE RISK OF ELECTRIC
SHOCK, DO NOT REMOVE COVER (OR BACK).
NO USER SEVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED
AFIN DEVITER UN CHOC
ELECTRIQUE, ET LES
QUI POURRAIENT EN
RESULTER, TENTEZ PAS
D'OUVRIR L'APPAREIL ET
DE TOUCHER AUX
SANS LA PRESENCE D'UNE
FRONT PANEL CONTROLS
A NOTE ON INSTALLATION
This unit may be installed on any sturdy, level sur-
face. Since its power transformers generate a mag-
netic hum field of moderate strength, a turntable
(especially one with a moving-coil pickup cartridge)
should not be located near the amplifier.
The amplifier requires ventilation. Do not obstruct
the air outlet grilles on the top or bottom covers, and
do not place the amplifier on a rug or other soft sur-
face. Do not place the amplifier in an enclosed situa-
tion such as in a bookcase or in a cabinet.
SAFETY WARNING: Please ensure that the
Volume controls at the rear of this amplifier are set to
minimum level (i.e. COUNTER CLOCKWISE, viewed
from the back panel).
If this piece of equipment is to be used in a multi-
room ouput of a NAD product, please ensure that
before turning on the system for the first time, the
Volume controls on any auxiliary amplifier ARE SET
TO THE MINIMUM LEVEL.
The multi-room output is not affected by the
Volume or Tone controls (Treble, Bass) of the main
system controls, so care must be taken to prevent
auxiliary amplifiers being driven at full output level.
WARNING TO UK USERS. If this appartus is not
fitted with a UK three-pin plug, do not attempt to
insert the attached plug into a UK mains socket.
Instead, cut the plug from the mains lead and attach
a fused UK three-pin plug using the following safety
advice on wiring.
IMPORTANT. The wires in this mains lead are
coloured BLUE and BROWN;
The colours of these mains lead wires may not cor-
respond with the coloured markings identifying the
terminals in your plug. In this case the BROWN wire
must be connected to the terminal which is marked
L(ive) or coloured RED. The BLUE wire must be con-
nected to the terminal marked N(eutral) or coloured
BLACK. No connection should be made to the termi-
nal marked E or coloured green or green and yellow
REAR PANEL CONNECTIONS
1. AC LINE CORD
Plug the AC line cord into a nearby wall outlet that
provides the correct AC power line voltage, or into a
switched convenience outlet on your preamp.
Each of the three independent stereo power ampli-
fiers within the 916 has its own pair of inputs and out-
puts. Before making connections to the amplifier,
make sure the POWER is switched OFF.
Connect the signal cable from the preamplifier, sur-
round decoder or other signal source to these inputs.
If you need fewer than six channels of amplification,
see BRIDGING (# 6).
3. LINE OUTPUTS
Each input has an accompanying line output which
will pass the signal on to another amplifier input or
other line-level device. The line outputs are buffered,
so that a low impedance or short circuit placed across
it will not affect the signal at the input. For multi-room
installations the line outputs may be connected to the
inputs of another pair of amplifiers within the 916 to
provide separate stereo amplification for one or two
other zones, each with its own level control (see # 4).
4. INPUT LEVEL
The amplifier is equipped with separate input level
controls for each channel. Before turning on the 916
for the first time, make sure all level controls are in
their normal full-clockwise position. Under some cir-
cumstances, other settings may be useful for:
(1). Level-matching. In a surround-sound or other
multi-amplifier system, reduce some of the controls
as necessary to balance the system with speakers of
(2). Extended volume-control range. Many stereo
systems have so much voltage gain that the speakers
(or your ears) are over-driven at any volume-control
setting higher than 11 or 12 o'clock. As a result you
are confined to using only the lower half of the vol-
ume control's range, where adjustments are impre-
cise and where channel-balance errors tend to be
greater. If all input-level controls are reduced, you
can turn up your preamplifier's volume control, mak-
ing effective use of most of its range. (Suggestion:
adjust the input level controls so that your preferred
maximum sound levels usually occur at about 2 or 3
o'clock on the volume control.)
As an added benefit, this procedure suppresses
any noise produced by the preamp's high-level cir-
cuitry (e.g. any residual hum or hiss that does not go
away when the Volume is turned down).
(3) Balance correction. Small errors in channel
balance can dramatically degrade the apparent
"depth" and "air" of the stereo image. Such balance
errors may be due to normal production-line differ-
ences in speaker sensitivity, differences in the
acoustic environment around the two speakers, and
slightly different distances from your chair to each
speaker. You can use the input-level controls to cor-
rect these fixed balance errors, freeing your preampli-
fier's balance control to correct balance errors in
Switch the preamp to mono and sit in your normal
listening location. Ideally the "phantom" central
image should seem to be floating in mid-air midway
between the left and right speakers. If it is located
off-center, closer to one speaker, turn down the input-
level control for that channel slightly in order to re-
center the phantom mono image. Then restore the
preamp to normal stereo operation.
5. SPEAKER CONNECTIONS
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 loudspeakers. Connect
NAD 916 MULTI CHANNEL
the loudspeakers with heavy-duty (16-gauge or thick-
er) stranded wire.
Connections may be made in either of two ways.
[See Figure 1.]
(1) Strip off a half-inch (1 cm) of insulation from
each speaker wire. In each conductor, twist the thin
strands of wire together. Unscrew the knob, insert
the bare wire into the opening at the base of the bind-
ing post, and tighten the knob until it grasps the wire
securely. Check to be sure that no loose strand of
wire is touching the chassis or an adjacent terminal.
Or, (2) Install banana plugs on your speaker
wires, and plug them into the end of each binding
post. The terminals are separated by 3/4 inch
(19mm), so they will accept dual-banana plugs.
The Model 916 contains three separate stereo
amplifiers - six channels in all. To use each pair as a
conventional stereo amplifier, connect the wires from
the left-channel speaker to the CH 1 + and CH 1 - ter-
minals (or to the corresponding terminals on channels
3 and 5) and the wires from the right-channel speaker
to the CH 2 + and CH 2 - terminals (or to the corre-
sponding terminals on channels 4 and 6).
NOTE - Stereo speakers must operate in phase
with each other in order to produce a focused stereo
image and to reinforce rather than cancel each
other's output at low frequencies. When connecting
speakers, take care that the red (positive) terminal on
each loudspeaker is connected to the corresponding
red (positive) terminal on the amplifier.
Each pair of amplifiers within the Model 916 can be
"bridged" to form a single amplifier of about three
times the power per channel. If you currently need
fewer than six channels of amplification, use this fea-
ture to increase the available amplifier power. For
example, bridging two of the 916's pairs of amplifiers
will yield two mono amplifiers of 90W apiece for the
main channels and one stereo amplifier of 30W per
channel for a remote set of speakers. For surround
systems, connect two channels to the front speakers,
one to the center channel, one to the surrounds, and
use a bridged pair to drive the subwoofer.
To convert to bridged operation:
(1) Select the two channels to be bridged. In this
example we will use channels 3 and 4. Other pairs of
channels are bridged in the same fashion.
(2) Switch the POWER off.
(3) Disconnect any input and output cables from
channels 3 and 4.
(4) Set the bridging switch to ON.
(5) Select the cable from the speaker that is to be
driven by the bridged section of the 916. Connect its
"positive" conductor to the CH 3 + terminal and its
"negative" conductor to the CH 4 + terminal (i.e. to
the two red terminals). DO NOT connect any wires to
the black terminals (CH 3 - and CH 4 -).
CAUTION: In the bridged mode, wires must be
connected directly from the amplifier to the speakers,
not to a speaker switch, a headphone adapter, or any
other device that shares a common ground between
(6) Connect the signal lead from the source chosen
to be amplified by the bridging amplifier to the input
socket of the CH3 amplifier
(7) Turn the POWER on.
NOTE - If you are using two pairs of speakers on
one channel, or if you are in the bridged mode, we
recommend that the speakers have a nominal imped-
ance of 8
7. SOFT CLIPPING
When an amplifier is driven beyond its specified
power output it normally produces "hard clipping" of
the signal with harsh distortion and power-supply
buzz as the output transistors saturate. The NAD
SOFT CLIPPING circuit gently limits the output wave-
form and minimizes audible distortion when the
amplifier is overdriven. We recommend that it be
switched ON when playing music at levels that might
exceed the amplifier's power capacity.
Press this button to switch the amplifier on or off. A
green LED above the power button illuminates when
the power is on.