NAD C270 - Manual

The all-new NAD C270 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 effi-
cient innovative design, simple circuitry and meticulous engineering.
“Building Block Concept”
For maximum flexibility, the C270 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 pow-
ered home theatre or stereo system.
Additional Features
The C270 also incorporates NAD's acclaimed switchable "Soft Clipping" cir-
cuit that significantly reduces the risk of damage to loudspeakers due to pro-
longed high power operation. The technological effort behind the C270
results in a relaxed unstrained musicality, with transparent high frequencies, a
deep solid bass foundation and a smooth well-integrated midrange. The out-
put 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 C270 is easily switched On or to
Stand-by from remote components featuring 12V trigger outputs. NAD's own
C160 preamp sport 12V trigger outputs, for instance. The inclusion of 12V
triggers make the C270 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 demand-
ing audiophiles.
Impedance Sensing Circuit (ISC):
The C270 also benefits from NAD's proprietary Impedance Sensing Circuit
(ISC) topology, now well established and used in many NAD models including
the highly reviewed C320 and C340. The ISC topology allows the C270 to
deliver maximum performance under virtually any circumstance, independent
of the loudspeakers it is driving. The circuitry automatically senses the imped-
ance of the loudspeaker and then adjusts its power supply settings to best
cope with that specific load.
With ISC topology, 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 to the mindless "brochure power" approach which does-
n't give a realistic indication of an amplifier's true capabilities. Instead, the
ISC topology 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 C270'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 C270 are fed from a separate low-noise,
high voltage discrete component regulated power supply, which effectively iso-
lates 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 mechani-
cal hum and stray magnetic field) and over-specified robust output devices
further lead to low noise and low distortion.
The C270 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 imped-
ance loads. What little distortion there is remains the same at 8 ohms or 4 ohms!
C 270 Stereo Power Amplifier
• 120W x 2 Continuous Power (8 ohms) • 210W, 340W, 450W Dynamic Power
into 8, 4 and 2 ohms, respectively • Bridgeable to 300W mono (8 ohms)
• 12V trigger input for remote Stand-by/On switching
• Both fixed and variable inputs, switch selectable
• Double set of loudspeaker binding posts to facilitate bi-wiring
• Impedance Sensing Circuit (ISC) topology • Toroidal Power transformer
• All discrete circuitry • All sockets Gold plated • Soft Clipping TM