Manual NAD M28 (page 7 of 10) (English)

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ENGLISH

PROTECT MODE

If one or more PROTECT LEDs turn red or become all extinguished, this

indicates that the protection circuitry of the M28 had been engaged.

Immediately press the Standby button, turn o Power switch and then

unplug the mains power cord from the mains power source. Undertake

the following

a Check if all speaker wires are connected correctly and that none of

the wires are damaged, causing a short circuit.

b Another cause may be excessive heat build-up inside the amplier.

Make sure there is adequate ventilation around the amplier and

that none of its ventilation slots, top or bottom are blocked. After

the amplier has cooled down, it will function normally again.

c In case one or more of the PROTECT LEDs or Power indicator remained

illuminated in red despite the checks mentioned above, immediately

press the Standby button, turn o Power switch and then unplug the

mains power cord from the mains power source. Have the unit inspected

by a qualied service technician before attempting to use it again.

4 SELECT

• Use this switch to select the type of analog audio input.

• SELECT switch settings

Upper position – SINGLE-ENDED input is selected.

Lower position – BALANCED input is selected.

WARNING!

Do not adjust the SELECT switch while the M28 is at operating mode.

Use SELECT switch to choose BALANCED or SINGLE-ENDED only when

the M28 is at standby mode or powered down.

5 +12V TRIGGER IN

• The +12V Trigger input allows the M28 to be switched remotely

from standby mode to ON and vice-versa by an ancillary equipment

such as a preamplier, AV processor, etc. The controlling device

must be equipped with a 12V trigger output to use this feature.

WARNING

The front panel o (Standby) button is disabled as long as the male plug

of the mono cable (with or without +12V DC) is connected to M28’s

+12V TRIGGER IN. Unplug the mono cable for the M28 to be normally

switched ON (or back to standby mode) using the front panel o

(Standby) button.

6 LED LEVEL (DIMMER)

• Toggle to reduce or restore Power indicator brightness or

completely turn it o.

7 FUSE HOLDER

• In the unlikely event a fuse needs to be replaced, unplug the mains

power cord from the wall. Then, remove all connections from the

amplier. Use a athead screw driver or similar to open the fuse

holder via the slot indicated. With the screw driver in place, push

and turn counterclockwise to open the fuse holder.

• Only replace the fuse with the same type, size, and specication.

IMPORTANT NOTICE

Do not use any substitute fuses of dierent types or with dierent

ratings or values. Failure to observe this precaution may cause damage

to the amplier circuits and may create a re hazard and/or defeat the

safety built into the amplier and may void the warranty.

8 SPEAKER

• The M28 is equipped with gold-plated, color-coded, transparent

and special high-current binding-post speaker terminals.

• Connect FRONT L, FRONT R, CENTER, SURR R, SURR L, SURR-BL and

SURR-BR speaker terminals to corresponding speakers. Make sure

the “+” (red) terminal and “-” (black) terminal are connected to the

corresponding “+” and “-” terminals of the speaker. Use extra care

to ensure that no stray wires or strands cross between posts or

terminals at either end.

• The M28 is designed to produce optimum sound quality when

connected to speakers with impedances within its operating range.

Please make sure that all the speakers are rated 4 ohms minimum

per speaker.

NOTE

Use stranded wire of at least 16 gauge (AWG). Connections to the M28

can be made with banana plugs or by using bare wire or pins. Use the

transverse hole through the post for bare-wire or pin connections. By

loosening the terminal’s plastic nut, make a clean, neat connection and

re-tighten carefully. To minimize the danger of short-circuit, ensure that

only 1/2-inch of exposed wire or pin is employed when connecting.

9 POWER

• Supply the AC mains power to the M28.

• When the POWER switch is set to ON position, the M28 goes to

standby mode as shown by the amber status condition of the

Power indicator. Press o (Standby) button to switch ON the M28

from standby mode.

• If you intend not to use the M28 for long periods of time (such as

when on vacation), switch o the POWER switch.

• The o (Standby) button cannot activate the M28 with the rear

panel POWER switched o.

10 AC MAINS INPUT

• The M28 comes supplied with two types of detachable mains

power cord. Select applicable type for your usage. Connect

corresponding end of the mains power cord to the AC mains input

of M28 and the plug connected to a mains power source.

• Always disconnect the mains power plug from the mains power

source rst, before disconnecting the cable from the M28’s AC

Mains input socket

IDENTIFICATION OF CONTROLS

REAR PANEL

SELECT

BALANCED

SINGLE-ENDED

PROTECT

ANALOG AUDIO INPUT

SELECT

BALANCED

SINGLE-ENDED

PROTECT

ANALOG AUDIO INPUT

SELECT

BALANCED

SINGLE-ENDED

PROTECT

ANALOG AUDIO INPUT

SELECT

BALANCED

SINGLE-ENDED

PROTECT

ANALOG AUDIO INPUT

SELECT

BALANCED

SINGLE-ENDED

PROTECT

ANALOG AUDIO INPUT

SELECT

BALANCED

SINGLE-ENDED

PROTECT

ANALOG AUDIO INPUT

SELECT

BALANCED

SINGLE-ENDED

PROTECT

ANALOG AUDIO INPUT

POWER

SPEAKER SPEAKER SPEAKER SPEAKER SPEAKER

SPEAKER SPEAKER

SELECT

BALANCED

SINGLE-ENDED

PROTECT

ANALOG AUDIO INPUT

SELECT

BALANCED

SINGLE-ENDED

PROTECT

ANALOG AUDIO INPUT

SELECT

BALANCED

SINGLE-ENDED

PROTECT

ANALOG AUDIO INPUT

SELECT

BALANCED

SINGLE-ENDED

PROTECT

ANALOG AUDIO INPUT

SELECT

BALANCED

SINGLE-ENDED

PROTECT

ANALOG AUDIO INPUT

SELECT

BALANCED

SINGLE-ENDED

PROTECT

ANALOG AUDIO INPUT

SELECT

BALANCED

SINGLE-ENDED

PROTECT

ANALOG AUDIO INPUT

POWER

SPEAKER SPEAKER SPEAKER SPEAKER SPEAKER SPEAKER SPEAKER

2 CHANNEL AUDIO OUT

UNBALANCED

R BALANCED

DIGITAL AUDIO OUTPUT

AES/EBU

S-VIDEO OUT

L BALANCED

POWER

COMPONENT VIDEO OUT

AUDIO OUT

L R

HDMI OUT1

HDMI OUT2

HDMI OUT1

HDMI OUT2

12V IN

12V OUT

DIGITAL AUDIO OUT

OPTICAL

COAXIAL

COMPONENT VIDEO OUT

12V IN

12V OUT

DIGITAL AUDIO OUT

OPTICAL

COAXIAL

POWER

100-240V ~ 50/60Hz

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NAD M28 Manual

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