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ENGLISH

6

1  BALANCED    

• 

Use the BALANCED analog audio input of the M28 if the external 
source to be connected has BALANCED audio output.  Superior 
audio quality is ensured with the distinctive noise reduction 
capability of BALANCED connection with XLR jacks. 

• 

With BALANCED as the selected audio input, ensure that SELECT 
switch is set to BALANCED. 

• 

For optimum heat dissipation in an AV surround system, the 
following audio channel allocations are recommended: 
Channel 1 = Front Left speaker
Channel 2 = Surround Left speaker
Channel 3 = Surround Back Left speaker
Channel 4 = Center speaker
Channel 5 = Surround Back Right speaker 
Channel 6 = Surround Right speaker
Channel 7 = Front Right speaker

PIN CONFIGURATION OF BALANCED XLR JACK

Pin 1: Ground
Pin 2: Positive (signal live) 
Pin 3: Negative (signal return)

IMPORTANT NOTES

•  Always turn OFF the M28 and other components in the system before 

connecting or disconnecting anything to the BALANCED audio input 
jacks. 

•  Before switching ON the M28 from standby mode for the first time, 

make sure that the volume control of the external source is set to 
minimum level position. This prevents inadvertently beginning a session 
at excessive volume.  

·  Depending upon the source’s configuration, analog audio input 

connection can be made up to seven channels either via BALANCED or 
SINGLE-ENDED input ports. 

2 SINGLE-ENDED

• 

Use single-ended analog audio input for sources (preamplifiers or 
processors) that are not equipped with BALANCED analog audio 
output. 

• 

With SINGLE-ENDED as the selected audio input, ensure that 
SELECT switch is set to SINGLE-ENDED. 

3 PROTECT 

• 

When a specific channel goes to protect mode, the corresponding 
PROTECT LED will turn red.  The other amplifiers that did not go 
to protect mode will continue to function as indicated by their 
respective PROTECT LEDs illuminated in green.

PROTECT LED INDICATOR COLORS 

CONDITION

PROTECT LED COLOR

POWER INDICATOR (NAD 

LOGO) COLOR

Normal operation

Green

Bright/white

Overheat

Red (per applicable channels; 

other channels may remain 

green)

Bright/white

Short circuit

No light (all channels)

Red

IDENTIFICATION OF CONTROLS

REAR PANEL

© NAD  M28

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

ON

SPEAKER

SPEAKER

SPEAKER

SPEAKER

SPEAKER

SPEAKER

SPEAKER

4

5

6

7

8

9

10

1

2

3

ATTENTION! 

 

Ensure that the M28 is unplugged before making any connections. It is also advisable to power-down or unplug all associated components while making 
or breaking any signal or AC power connections.

Summary of Contents for M28

Page 1: ...Owner s Manual Seven Channel Power Amplifier M28 NAD M28 ENGLISH FRAN AIS ESPA OL ITALIANO DEUTSCH NEDERLANDS SVENSKA...

Page 2: ...An outside antenna system should not be located in the vicinity of overhead power lines or other electric light or power circuits or where it can fall into such power lines or circuits When installing...

Page 3: ...appliance with a protective earth terminal should be connected to a mains outlet with a protective earth connection RESPONSIBLE PARTY Lenbrook International 633 Granite Court Pickering ON L1W 3K1 Can...

Page 4: ...external source s volume control according to desired listening level SAVE THE PACKAGING Please save the box and all of the packaging in which your M28 arrived Should you move or otherwise need to tra...

Page 5: ...ANDBY The M28 can be setup to automatically go to standby mode if there is no active source input within 30 minutes Auto standby mode can be enabled or disabled by the following steps Enable Auto Stan...

Page 6: ...SINGLE ENDED input ports 2 SINGLE ENDED Use single ended analog audio input for sources preamplifiers or processors that are not equipped with BALANCED analog audio output With SINGLE ENDED as the sel...

Page 7: ...o the amplifier 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...

Page 8: ...the rear panel Unplug the mono plug No sound No input signal applied through the analog audio input ports Check that there is active input signal applied through the analog audio input ports External...

Page 9: ...Damping factor 750 ref 8 ohms 50 Hz and 1 kHz Input sensitivity 1 3V ref rated power Input impedance 47 kohms Balanced 23 kohms Single ended Signal noise ratio 102dB A weighted ref 1W Balanced 97 dB A...

Page 10: ...onal a division of Lenbrook Industries Limited No part of this publication may be reproduced stored or transmitted in any form without the written permission of NAD Electronics International While eve...

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