NAD Electronics S250 User Manual download pdf (Page 6)

7. SOFT CLIPPING

When an amplifier is driven beyond its specified power output it

normally produces “hard clipping” or distortion of the signal. Such

hard clipping, in addition to sounding unpleasant, can damage the

speakers in the system. The NAD Soft Clipping circuit gently limits

the output waveform, minimizing audible distortion and reducing the

change of speaker damage when the amplifier is overdriven. We

recommend that the Soft Clipping switch on the back panel of the

S250 be left in the ON position when system is being operated at

levels that might exceed the amplifier’s power capacity. The LED on

the front panel indicates if Soft Clipping has been engaged.

FRONT PANEL CONTROLS

1. POWER SWITCH

Press this button to switch the amplifier on or off. The Power LED

located just above the power button and Protection LED will light up.

After a few seconds, the Protection LED will turn off, indicating that

the amplifier is ready for use.

The S250 can also be remotely switched from On to Stand-by and

vice-versa using the 12V-trigger input on the back panel. For the

12V-trigger input to work, the S250 must first be turned on by

means of the Power switch, and the switch must be left in this

position. Using the 12V-trigger source component, switch its 12V-

trigger output to on and off. The S250’s trigger input will now follow

the source component’s 12V-trigger output. Ensure that the Auto

Trigger switch on the back panel is in the ON position and that the

12V-trigger input is connected properly.

NOTE: If no cable is attached to the 12-trigger input socket on the

S250’s back-panel, the Power Switch will operate as normal, even if

the Auto Trigger switch on the back panel is in the ON position.

2. SOFT CLIPPING LIGHTS

When the Soft Clipping circuit of the S250 is activated the indicator

LED’s on the front panel will light.

3. PROTECTION/STAND-BY LED

The Protection LED will light up every time the amplifier is switched

on. After a few seconds it will extinguish and the amplifier is ready

for operation. With the 12V trigger input activated (Auto Trigger

switch on back-panel set to ON position) the Protection LED will also

light up to indicate Stand-by status. In this mode, the Power LED will

be off.

This LED will also come on when one or more of the internal five

amplifiers go into protect mode, but the other amplifiers will

continue to function so it is likely you will still hear sound.

When the amplifier is switched off completely from normal operation

by means of the power switch, the Protection LED will light up and

will fade out in a couple of seconds.

NOTE: If you see the Protection LED light up during use, turn off the

amplifier immediately. Check if all speaker wires are connected

correctly and that none of the wires are damaged, causing a short

circuit. Another cause may be excessive heat build-up inside the

amplifier. Make sure there is adequate ventilation around the

amplifier and that none of its ventilation slots, top or bottom, are

blocked. After the amplifier has cooled down, it will function

normally again.

In case the Protection LED remains on despite the checks mentioned

above, turn the amplifier off and consult your NAD dealer.

NOTE: Looking through the S250’s top-cover you may be able to see

5 LEDs. During normal operation these will light up green. In Stand-

by mode all LEDs will light up red. Whenever one of the channels

goes into protection mode, the corresponding LED will also turn

from green to red. If this occurs, switch the amplifier off immediately

and check as indicated above for correct connection and/or heat

build-up.

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NAD Electronics S250 User Manual Page 6

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