NAD Electronics C270 User Manual download pdf (Page 5)

5. SPEAKERS A & SPEAKERS B

The NAD C270 is equipped with two sets of speaker connectors

wired in parallel to facilitate connection of multiple pairs of

speakers or “Bi-Wiring”. Use the Speakers A connectors for the

‘main’ speakers and use the Speakers B connectors for a second

pair, for example, extension speakers located in another room.

Under normal operation, connect the right speaker to the

terminals market ‘R +’ and ‘R-’ ensuring that the ‘R+’ is

connected to the ‘+’ terminal on your loudspeaker and the ‘R-’

is connected to the loudspeaker’s ‘-’ terminal. Connect the

terminals marked ‘L+’ and ‘L-’ to the left speaker in the same way.

In Bridge Mode, connect the single speaker to the terminals

marked ‘R +’ and ‘L+’ ensuring that the ‘L+’ is connected to the

‘+’ terminal on your loudspeaker and the R+ is connected to the

loudspeaker’s ‘-’ terminal. Refer also to section “Bridge Mode” in

this chapter (No. 6).

Always use heavy duty (16 gauge; 1.5mm, or thicker) stranded wire

to connect loudspeakers to your NAD C270. The high-current binding

post terminals can be used as a screw terminal for cables terminating

in spade or pin sockets or for cables with bare wire ends.

BARE WIRES AND PIN CONNECTORS

Bare wires and pin sockets should be inserted into the hole in the

shaft of the terminal. Unscrew the speaker terminal’s plastic

bushing until the hole in the screw shaft is revealed. Insert the pin

or bare cable end into the hole and secure the cable by tightening

down the terminal’s bushing. Ensure bare wire from the speaker

cables does not touch the back panel or another socket . Ensure

that there is only 1/2” (1cm) of bare cable or pin and no loose

strands of speakers wire.

NOTE: Make sure the speaker impedance is 4 ohms or more

when connecting only one pair of speakers; make sure the

speaker impedance for all speakers is over 8 ohms when

connecting two sets of speakers. In Bridge Mode, the impedance

of the loudspeaker should also be 8 ohms or higher.

Always turn the C270 and other components in the system off

before connecting or disconnecting speakers.

6. BRIDGE MODE

The stereo NAD C270 power amplifier can be configured to be

mono (Bridge Mode), more than doubling its output power: 2 x

120 vs. 1 x 300 Watt. This way, the NAD C270 can be used as part

of a high power stereo or home-theatre system, by connecting

adding additional power amplifiers.

Set the BRIDGE MODE switch to the “Bridge” position and

connect the speaker to the terminals marked ‘L +’ and ‘R+’

ensuring that the ‘L+’ is connected to the ‘+’ terminal on your

loudspeaker and the ‘R+’ is connected to the loudspeaker’s ‘-’

terminal. Connect the source to the Left MAIN-IN input.

In Bridged Mode the NAD C270 will produce approximately 300W

into an 8 ohm loudspeaker. In this mode, the amplifier sections

will react as though the speaker impedance has been halved. Low

impedance speakers (under 8 ohms) are not recommended when

using Bridge Mode, as these may cause the amplifier’s thermal

cut-out to operate if played at high levels.

The Bridge Mode indicator on the front panel (Fig. 2; No. 4) will

illuminate when the amplifier is in Bridge mode.

NOTES: Do not connect anything to the Right “Fixed In” or Right

“Variable In” sockets when Bridge Mode is selected.

Always turn the C270 and other components in the system off

before connecting or disconnecting anything to the “Fixed In” or

Variable In” sockets.

7. SOFT CLIPPING™

When an amplifier is driven beyond its specified power output, a

hard, distorted sound can be heard on very loud sounds. This is

caused by the amplifier cutting off or ‘hard clipping’ the peaks of

sound that it was not designed to reproduce. The NAD Soft

Clipping™ circuit gently limits the output of the system to

minimise audible distortion if the amplifier is overdriven.

If your listening involves moderate power levels you may leave the

Soft Clipping™ switch to Off. If you are likely to play at high levels,

that could stretch the amplifier’s power capability, then switch Soft

Clipping™ On.

The Soft Clipping™ indicator on the front panel will illuminate

when the amplifier is in Soft Clip mode.

8. 12V TRIGGER AUTO ON-OFF

The C270’s 12V trigger input allows it to be switched to On and

Stand-by remotely by an external component.

Set the 12V Trigger switch set to the “ON” position to activate the

12V Trigger input. When the switch is set to the Off position, the

12V trigger input is not active. Refer to section “12V Trigger In”

below for more information.

9. 12V TRIGGER IN

This input allows the C270 to be switched remotely to stand-by

and on or by ancillary equipment such as a preamp, AV processor,

etc. which are also equipped with a 12V trigger output.

For switching Stand-by/Power On of the C270 by an external

component, connect the12V-trigger input of the C270 to the

remote component’s DC output jack. The plug required is a

standard 3.5mm Mini-Jack plug (“mono”): The tip is the live or

+ connection, the shaft of the input jack is the 12V-trigger - or

ground connection.

NOTES: The C270’s 12V Trigger will work within a range of 6 to

15 V DC level and typically draws less than 10mA of current.

Check the specifications of the Trigger output terminal on the

remote component to ensure it is compatible with the C270’s 12V-

trigger input. NAD components equipped with 12V output triggers

are fully compatible with the C270’s 12V input trigger.

Before making any connections to any 12V trigger input or output,

make sure all components are disconnected from the AC mains.

Failure to observe the above may result in damage to the C270 or

any ancillary components attached to it. If in doubt over the

connections, installation and operation of the 12V trigger output

consult your NAD dealer.

10. AC LINE CORD

Plug the AC power cord into a live AC wall socket. Make sure all

connections have been made before connecting to mains.

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NAD Electronics C270 User Manual Page 5

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