C 272 Stereo Power Amplifier

C 272 Stereo Power Amplifier
C 272 Stereo Power Amplifier
• 2 x 150W Minimum Continuous Power into 4/8 ohms
• 220W, 340W, 460W IHF Dynamic Power into 8, 4 and
2 ohms, respectively
• PowerDrive™
• High Current Holmgren™ Toroidal Power Transformer
• Bridgeable to 400W mono (8 ohms)
• Both fixed and variable inputs, switch selectable
• Double set of loudspeaker binding posts to facilitate
bi-wiring
• All Discrete Circuitry
• Gold plated RCA Connectors
• NAD Soft Clipping™
• 12V Trigger Input for remote Stand-by/On switching
• IEC Detachable Power Cable
• ATO Logic
The all-new NAD C 272 is part of a new range
of amplifiers, which will further enhance
NAD’s enviable reputation for state of the art
products at sensible prices. The key design
goals of the new range are PERFORMANCE
and RELIABILITY. Both are attained at a very
competitive price through efficient innovative
design, simple circuitry and meticulous
engineering.
“Building Block Concept”
For maximum flexibility, the C 272 can operate
in bridged mono mode, nearly tripling its single
channel stereo mode continuous power rating
into 8 ohms.This makes it an ideal choice for a
subwoofer amplifier or part of a high powered
home theatre or stereo system.
Additional Features
The C 272 also incorporates NAD’s acclaimed
switchable “Soft Clipping” circuit that
significantly reduces the risk of damage to
loudspeakers due to prolonged high power
operation. The technological effort behind the
C 272 results in a relaxed unstrained musicality,
with transparent high frequencies, a deep solid bass
foundation and a smooth well-integrated midrange.
The output relay protection circuit provides silent switch
on and off, together with non-evasive protection against
error conditions such as short circuits and overheating.
Using the 12V trigger input, the C 272 is easily switched
On or to Stand-by from remote components featuring
12V trigger outputs. NAD’s own C 162 preamp sport 12V
trigger outputs, for instance. The inclusion of 12V triggers
make the C 272 an ideal choice for demanding, high
quality Custom Install applications. Equipped with two
sets of loudspeaker binding posts, adding a second pair of
speakers becomes easy. The second set of binding posts
will also facilitate “bi-wiring” speakers, a practice popular
with demanding audiophiles.
PowerDrive™
The C 272 also benefits from NAD’s proprietary
PowerDrive amplification circuitry, now well established
and used in many NAD models including the highly
reviewed C 320BEE and C 350. PowerDrive allows the
C 272 to deliver maximum performance under virtually
any circumstance, independent of the loudspeakers it is
driving. The circuitry automatically senses the impedance
of the loudspeaker and then adjusts its power supply
settings to best cope with that specific load.
With PowerDrive, the relationship of voltage to current
is kept at an ideal proportion, eliminating the current
limiting distortion common in lesser designs. This also
gives it an unusual characteristic compared to traditional
amplifiers when measuring its continuous output power;
the RMS output power remains the same at 120 watts with
either an eight or a four-ohm load. This is not unusual for
NAD however. NAD takes a stance against the mindless
“brochure power” approach which doesn’t give a realistic
indication of an amplifier’s true capabilities. Instead,
PowerDrive is a practical approach to enable an amplifier
to easily deal with musical dynamics and difficult speaker
loads. More meaningful in the real world are the C 272’s
dynamic capabilities; up to 450 watts into 2 ohms and up to
70 amps current capability into 1 ohm!
Design Features
The input and driver stages of the C 272 are fed from a separate
low-noise, high voltage discrete component regulated power
supply, which effectively isolates them from the high current output
stage of the amplifier ensuring the lowest possible levels of noise
and distortion. Careful design incorporating sensible grounding
results in an amplifier with an exceptionally clean, noise free output
signal.
Other design features include the generous power supply with a
large toroidal transformer (less mechanical hum and stray magnetic
field) and over-specified robust output devices further lead
to low noise and low distortion. The C 272 exhibits extraordinarily
low levels of distortion at all power levels and under almost any
operating condition. Unlike most amplifiers, distortion does not
increase at the frequency extremes or even when presented with
low impedance loads. What little distortion there is remains the
same at 8 ohms or 4 ohms!
Power Amp Section
Power output Stereo Mode
2 x 150W (21.76dBW)
(8Ω within rated distortion)
0.02%
Rated distortion (THD 20Hz-20kHz)
180W (22.55dBW)
Clipping power
3dB
IHF dynamic headroom at 8Ω
IHF dynamic power at 8Ω
220W (23.42dBW)
IHF dynamic power at 4Ω
340W (25.31dBW)
IHF dynamic power at 2Ω
460W (26.62dBW)
>150
Damping factor (ref. 8Ω, 50Hz)
20kΩ/470pF
Input impedance
Input sensitivity (for rated power into 8Ω)
1.3V
Voltage gain
29dB
Frequency response; 20Hz-20kHz
± 0.3dB
Signal/noise ratio; ref 1W
>100dB
Signal/noise ratio; ref rated power
>120dB
Bridged Mode
Continuous average power output into 8Ω
300W (24.8dBW)
IHF dynamic headroom at 8Ω
2.2dB
IHF dynamic power at 8Ω
780W (27dBW)
IHF dynamic power at 4Ω
1132W (28.5dBW)
Physical Specifications
Dimensions (W x H x D)
17 1/8 x 5 3/16 x 13 13/16”
(435 x 132 x 350mm)
Net weight
24.8 lbs (11.2kg)
Shipping weight
31.3 lbs (14.2kg)
NAD Electronics International reserves the right to change specifications or features without notice. NAD is a registered trademark of NAD Electronics
International. All rights reserved. No part of this publication may be reproduced, stored, or transmitted in any form whatsoever without the written
permission of NAD Electronics International. © 10/03 NAD Electronics International.
www.NADelectronics.com
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