The Masters Series – M25 Seven Channel Power Amplifier
- THX Ultra 2 Certified
- 7 X 160 watts Full Disclosure Power,
20Hz - 20kHz, at less than 0.03% THD with all
channels driven simultaneously into 8/4 Ohms
- PowerDrive™
- Dynamic power of 220 watts at 8 Ohms, 385
watts at 4 Ohms, and 485 watts at 2 Ohms
- NAD’s Custom-Made “Holmgren” transformer
- NAD Soft Clipping™
- Precision low noise Input Level Controls
- Custom 5 way Binding Posts
- 12V Trigger for advanced control options, 1 in
- Detachable AC cord
MASSIVE POWER
More power is always better when it comes to sound quality. Power is
required not only to play loudly, but also to play cleanly without audible
distortion. When an amplifier is asked for more power than it was
designed to deliver, it can only respond with distortion.
Fortunately the M25 is one of the most powerful amplifiers on the market
today designed for home use. With a minimum of 160 continuous watts
per channel, all channels driven simultaneously, from 20Hz to 20kHz at
rated distortion of 0.03%, the M25 easily delivers lifelike sound levels
even in large home theatre rooms. It handily meets THX’s most stringent
certification level, Ultra 2.
Unlike most surround sound receivers (NAD’s own receivers are a
rare exception) that only rate power with 1 or 2 channels running, or
use very short term measurements, the M25 can deliver its full rated
power continuously for hours on end. Custom designed heat sinks and
thermostatically regulated variable speed fans keep things cool under the
most severe operating conditions. A unique fan circuit that tracks signal
level, actually shuts down the fans during quiet passages to prevent any
mechanical noise from interfering with the program material.
But it’s not just the quantity of power that is important, it is also the quality
of power that determines whether you can hear just a fiddle sound, or the
unique character of a Stradivarius violin.
SOPHISTICATED CIRCUITRY
The M25 is comprised of 7 individual ‘Monoblock’ amplifier channels. Each
channel uses a balanced junction FET input stage resulting in exceptionally
low levels of noise and distortion. NAD employs a unique electronic
ground isolation circuit to prevent ground loop noise in the system – a
common problem in complex multi-channel systems. This circuit offers
high input impedance for negligible loading on source components which
results in less noise and distortion in the real world.
A fully complementary differential class A voltage amp with a push pull
cascode output stage, provides ample current to drive the triple emitter-
follower output stage. This circuit topology offers very low distortion
combined with high current capability.
