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NADs PowerDrive- circuitry measures each channels
dynamic impedance individually and computes the optimum
power supply voltage required to drive the output stage for
maximum power and effi ciency. PowerDrive permits high
dynamic power and low impedance drive capability, while
maintaining ultra low (<0.03%) levels of distortion.
The M25 also incorporates NADs acclaimed switchable
Soft Clipping circuit.
Each channel has individual over
current, DC, infrasonic and ultrasonic overload sensing
and protection for complete reliability under even the most
severe operating conditions.
MASSIVE POWER SUPPLY
The M25 utilizes NADs proven Holmgren Toroidal
transformer design, in a massive size, to create a power
supply that offers very well regulated voltage, and truly
massive amounts of current. The Holmgren transformer
design utilizes proprietary low leakage fi eld technology
which is very low in both electrical noise (stray fi eld) and
physical noise (buzz).
Multiple 100,000 uF, 100V low ESR capacitors ensure a clean
DC voltage supply for very low noise and truly explosive
dynamics. Ultra low impedance copper buss bars are used
exclusively throughout for power delivery and grounding.
DETAIL ENGINEERING
It is the many small details that differentiate a really great
amplifi er from a merely adequate one. Buffered low
impedance level controls allow system fi ne tuning without
the distortion typical of most level control circuits. Custom
designed gold plated speaker binding posts offer multiple
connector options, while maintaining a large, corrosion-
free, low impedance contact area. Input jacks are also
custom designed for maximum performance. Even the feet
that support the M25 are engineered to fi lter out vibration
and provide maximum performance.
PUTTING IT ALL TOGETHER
The highly developed, yet elegantly simple circuitry of the
M25, is matched with a brute force power supply to create
one of the most powerful Home Theatre amplifi ers on the
market today. Yet all this power is balanced by a liquid
and transparent sonic signature that is subtlety nuanced
and insightful. The M25 simply adds another dimension to
surround sound that must be heard to be believed.
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Continuous Power, 20Hz-20kHz, all channels
driven simultaneously at 4/8 ohms
Rated Distortion (THD 20Hz-20kHz)
Clipping Power (0.1% THD)
IHF dynamic headroom at 4 ohms
IHF dynamic power at 8 ohms
IHF dynamic power at 4 ohms
IHF dynamic power at 2 ohms
Damping Factor
Input Impedance
Input Sensitivity
Voltage Gain
Frequency Response
Signal/Noise Ratio
Dimensions (W x H x D)
Net Weight
Shipping Weight
>160 W (22.0 dBW)
0.03%
>180 W
3.4dBW
>220 W (23.4 dBW)
>350 W (25.4 dBW)
>460 W (26.6 dBW)
ref. 8 ohms, 50Hz >180
1 Mohms;C = 180 pF
1250mV+/-50mV
29.0dB
20 Hz - 20 kHz ±0.2 dB
- 3dB at 3 Hz/70 kHz
>96 dB ref. 1 W
>118 dB ref. 160W
17 x 7 7/8 x 18 3/8
435 x 200 x 465.6mm
96.3 lbs (43.7 kg)
112.3 lbs (51.0 kg)
Preliminary Specifi cationsPreliminary Specifi cations
