Hybrid Digital Amplification: The NAD M22 stereo power
amplifier is using the latest nCore amplifier technology licensed from Hypex
which offers distortion below measurement, ultra-high damping factor, and
unconditional stability with any speaker. The result is tight, detailed sound
with amazing control and transparency. With nCore,
Hypex has refined their amplifier concept to new levels of perfection by improving the
modulator for more accurate feedback subtraction and PWM generation. The
all-discrete driver and output stage have also been improved for lower open-loop
THD as well as lower idling losses, normally conflicting requirements with
conventional IC driver circuitry. An added control loop incorporating an
integrator with adaptive clipping enables 20dB more feedback to be used across
the audio band because of its extremely low-phase shift resulting in a dramatic
reduction in distortion across the audio band. This is added to nCore's already
amazing characteristics of load invariance and high current capability, common
characteristics of great-sounding amplifiers.
PowerDrive: The M22 uses NAD's proprietary Digital
PowerDrive amplifier technology that allows substantial additional power for
short periods of time. Employing the latest generation of NAD's
digital PowerDrive, the M22 offers a minimum of 250W per channel with amazing
reserves of dynamic power at lower impedances. The M22 is capable of >300W
dynamic power per channel even in 8 ohms, and >600W in 2 ohms. It can
effortlessly power any loudspeaker to live performance levels with amazing
efficiency and low power consumption. Control for PowerDrive is derived by
sensing the average output power, applying a time constant, and then cleanly
hard clipping the signal thus limiting it to the rated continuous clipping power
over a sustained loading. By controlling the power envelope maximum clean power
is obtained for every operating condition.
Note: Research has shown that the peak to average power required to
faithfully reproduce music can be a factor of ten for well recorded
performances. Digital PowerDrive uniquely satisfies this requirement. Music
sounds more dynamic and "open" with PowerDrive because the musical transients
that are present in a live performance are not reduced in amplitude or
Unique Circuit Topology: The output stage is only one
of several circuits in the amplifier, and each must complement the other to
obtain optimal performance. The amp is DC coupled throughout, from input to
output, there is no capacitor in the forward signal path. Yet, it has a
beneficial 12dB/octave roll-off below 2Hz. It does this using a unique circuit
topology that is functionally a forward servo. It is however not a servo in the
traditional sense as it does not measure DC at the output and send back a
correction signal. Instead part of the input signal is fed to a side chain with
a second order low-pass filter. The output of this is subtracted from the
forward signal input to the second stage thus rejecting DC.
Dynamic Power Supply: The performance of the entire
signal path is critically dependent on the power supply; in this case a well
regulated, but not too tight, custom switch mode design. This allows maximum
dynamic power, very high current yet with very low distortion. Secondary
supplies are individually regulated and decoupled at each op-amp for lowest
possible noise and maximum dynamic range.
Balanced & Unbalanced Inputs: The NAD M22 offers balanced XLR and
unbalanced RCA connectivity.
Binding Post Speaker Terminals: The NAD M22 is equipped with four
gold-plated, color-coded binding post terminals to connect your speaker wire.
The binding post speaker terminals will accept bare wire (16-10 AWG),
pin-connectors, or banana plugs (single only).
+12V Trigger Input: The +12V Trigger input allows the M22 to be
switched remotely from "Standby Mode" to "On" and vice-versa by your
preamplifier or AV processor that is equipped with a 12V trigger output.
Auto Standby: The M22 can be setup to automatically go to standby mode
if there is no active source input for approximately 30 minutes.
Protect Mode: If the Protect LEDs turn red, this indicates that the
protection circuitry of the M22 has been engaged. This may occur if there is a
short-circuit in one of your speaker wires or excessive heat build-up.
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