Hybrid Digital Amplification: NAD has moved away from the
old-fashioned power-hungry linear power supplies and Class AB output stages that
waste nearly half of the energy consumed and produce heat rather than sound.
Instead, NAD has developed even better performing circuits based on switch mode
power supplies and Class D output stages. Once thought to be inferior to
traditional topologies, this new Hybrid Digital Amplifier design is very linear
over a wide bandwidth and provides consistent performance into all speaker
loads, providing a dramatic advancement over previous Class AB and Class D
- Customized Hypex UcD Output Stage: The C 268 stereo
power amplifier uses a customized version of the proven Hypex UcD output
stage operating in a fully balanced bridge configuration. This allows for
massive power with nearly un-measurable distortion and noise in the audible
range. Every detail of this design has been carefully planned and perfectly
executed to deliver every last drop of performance.
- PowerDrive Technology: The power supply of the C 268 is capable
of nearly 200 watts continuously and over 500 watts instantaneously,
allowing for short term musical transients. NAD's innovative asymmetrical
PowerDrive fully utilizes every last watt available with its vast reserves
of dynamic power available to accurately reproduce the most demanding music
without distortion or compression. It can also operate with any AC mains
voltage from 100V to 240V, and provides pure DC power to all the various
stages of the C 268. This highly efficient supply also provides near perfect
regulation of voltage across a wide range of conditions and provides a solid
noise-free foundation for the amplifying stages.
Full Disclosure Power (FDP): NAD uses Full Disclosure Power
(FDP), the most demanding criterion for performance measurement. FDP specifies
distortion under the most extreme conditions of low impedance loads and
frequency extremes, rather than the simple and easy 1kHz @ 8 ohms test quoted by
many of other manufactures. NAD uses this stricter performance criterion because
it more closely matches the demands of real music and real loudspeakers.
Maintaining specified distortion at 4/8Ω and at 20-20kHz is a much more
difficult achievement. The benefit of NAD's Full Disclosure Power is the total
elimination of audible distortion at any listening level. This provides pinpoint
imaging and realism with music and movies alike.
- Continuous Power:
- Stereo: 80 watts x 2-channel (@ 20-20kHz, into 4Ω
or 8Ω, with 0.03% THD, both channels driven)
- Bridged: 300 watts x 1-channel (@ 20-20kHz, into 4Ω or 8Ω,
with 0.03% THD, one channel driven)
- IHF Dynamic Power:
- Stereo: 120W into 8Ω / 200W into 4Ω / 250W into 2Ω (@ 1kHz
with 1% THD)
- Bridged: 500W into 8Ω / 560W into 4Ω (@ 1kHz with 1% THD).
Stereo or Bridged Mode: The NAD C 268 can be used as a two
channel amplifier in Stereo mode or a mono channel amplifier in Bridged mode.
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
Balanced & Unbalanced Inputs: The NAD C 268 stereo power amplifier is
equipped with balanced XLR and unbalanced RCA inputs. It can accommodate all
kinds of analog source components by offering ideal input impedance traits with
linear ultra-low-noise buffer amplifiers to prevent any sonic degradation that
may be caused by the source device's output impedance. The balanced XLR
connectors use this configuration - Pin 1: Ground, Pin 2: Positive (signal
live), and Pin 3: Negative (signal return).
Binding Post Speaker Outputs: The speaker output terminals
consist of four binding posts to connect a single pair of loudspeakers in Stereo
mode or only one speaker in Bridged mode. The amplifier supports 4Ω to 8Ω
speakers in Stereo mode and only 8Ω speakers in Bridged mode. These binding post
terminals will accept bare wire (up to 10AWG), pin-connectors, spade-lugs, and
banana plugs (single only). You'll need to remove the plastic inserts within the
binding-post terminals to connect banana plugs.
Stereo RCA Line Output: The stereo RCA line output allows
"daisy-chaining", so more than one amplifier can be used to add speakers to the
Controls: The NAD C 268 stereo power amplifier features Input Select
switch, Input Level knob, and Auto Sense Level switch on the rear-panel.
- Input Select: Use the Input Select switch to change the C 268 to
a "Fixed" or "Variable" output. With a "Fixed" output, the C 268's audio
output level is control by an external preamplifier. With a "Variable"
output, the C 268's audio output level can be adjusted using the Input Level
control knob on back of the power amp.
- Input Level: With the Input Select switch set to "Variable", the
Input Level control knob can be used to adjust the audio output level of the
- Auto Sense Level: The Auto Sense feature instantaneously turn the
C 268 to "Operating" mode from "Standby" mode if it senses a specific input
signal level applied to either the balanced XLR or unbalanced RCA inputs.
There are three Auto Sense levels - Low (0.85mV), Mid (1.7mV), and High
12V Trigger In/Out: The NAD C 268 is outfitted with a 12V Trigger
Input and Output, each consisting of a female 3.5mm jack. The 12V Trigger Input
allows the C 268 to be switched On remotely from Standby mode by a preamplifier
with a 12V Trigger Output. The 12V Trigger Output switches on a connected
external device that features a 12V Trigger input when the C 268 is powered on.
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