Nad M 3 Brochure
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and mono settings. Tone controls offer bass and treble adjustment, as well as a spectral tilt option that is highly effective at correcting the tonal balance of many recordings by simultaneously increasing the bass and decreasing the treble (and vice versa) to create a warmer (or cooler) balance. We have also included a second set of preamp outputs and a switchable high pass fi lter for the internal amplifi er, to allow easy implementation of an active subwoofer or biamplifi cation. The rugged chassis is built using thick 2mm mild steel plates with a front panel employing extruded aluminum and die-cast zinc in its construction. Special attention was paid to the control of mechanical resonance, as this can affect sonic performance. Special isolation feet use aluminum and silicon rubber in a vibration damping confi guration. All signal connectors are heavy duty gold plated types specifi cally engineered for the NAD Masters Series components. Finished inside and out, the M3 utilizes powder coating and advanced automotive paint fi nishes, creating an enduring and elegant mechanical package. PREAMP DESIGN The preamp uses all discrete low noise high impedance J- FET buffer amps and very high quality reed relay switches at the preamp input. Special high current low output impedance Class A gain modules provide tremendous dynamic headroom and high output current, combined with a exceptional S/N ratio in excess of -100dB (IHF). The volume attenuator is very unique in that it uses discrete 1% precision resistors that keep impedance (and noise) very low. It is arrayed in 3 stages to reduce the residual noise in each amplifying stage and prevent the cascade effect of noise that is present in most preamp designs. This circuit also provides the balance control, and as a result channel separation is superb and inter-channel cross talk is virtually eliminated. These resistor arrays are switched using 15 volt digital switches under software control, keeping all attenuation at the ideal point in the circuit architecture. Low impedance stepped tone controls provide +/- 5 db of boost/cut in the bass and treble regions, or can be confi gured to provide variable slope, or spectrum tilt at +/- 3dB per decade. Biamp function allows the use of a second amplifi er or active subwoofer PreOut 2, and offers a high pass fi lter function on PreOut 1, with selectable 40Hz, 60Hz, 80Hz, 100Hz or Full Range options. These are analog 2nd order fi lters confi gured around the low impedance differential Class A output stage of the preamp. This output stage also employs proprietary distortion cancellation circuitry. A balanced line input is also provided using identical JFET buffers feeding a discrete differential amp and yielding common mode rejection in excess of 80dB. Separately regulated DC supplies are derived from the dual mono power supply. Copper buss bars and discrete regulators keep circuit noise to an absolute minimum throughout. The display and digital functions operate from an independent power supply to prevent any interference with the analog signal path. POWER AMP HIGHLIGHTS The M3 features a Dual Mono design with separate unregulated, and discrete regulated supplies for different stages of the 2 channels. The twin custom-made Holmgren toroidal transformers use proprietary magnetic shielding technology. High current rectifi ers feed low ESR 105C fi lter capacitors. NADs PowerDrive technology measures load impedance continuously on each channel and adjusts the power supply voltage for maximum undistorted dynamic power into the connected speaker at all times and under all operating conditions. The signal processor also continuously measures temperature and average long term power and, based on this information, chooses the optimum voltage. PowerDrive allows the M3 to sound far more powerful than its already impressive 180 watt per channel rating would suggest. Totally effortless sound, even at elevated levels, is the hallmark of the PowerDrive amplifi er. The M3 utilizes a wideband current-mode Class A voltage amp featuring large open loop compensated bandwidth, and running from low noise stabilised power supplies. NADs patented current amp output stage starts with < 0.02 % static and dynamic distortion open loop (before feedback), even into 3 ohms at 20-20k at all levels. By utilizing small amounts of feedback the circuit returns distortion levels at all audible frequencies that are at limit of measurement – less than 0.002%! The super rugged output stage features 4 pairs of 150W discrete bipolar output transistors per channel, for 50A peak undistorted output current. Massive heat sinking assures a lifetime of trouble free operation.
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Pre-Amp Section Line level inputs Input impedance (R+C) Balanced Input impedance (R+C) Input sensitivity, rated power Frequency response (-3dB - 70kHz)* Line level outputs Output impedance Tape Signal/noise ratio Tone Controls Bass Treble Spectral Tilt Power Amp Section Continuous output power into 4/8 ohms † Rated Distortion (THD 20Hz - 20kHz) Clipping power ‡ IHF dynamic headroom at 8 ohms IHF dynamic power at 8 ohms IHF dynamic power at 4 ohms IHF dynamic power at 2 ohms Damping factor (ref. 8 ohms, 50Hz) Input impedance Input Sensitivity (for rated power into 8 ohms) Voltage gain Frequency response; 20Hz-20kHz -3dB at: Signal/noise ratio; ref 1W Signal/noise ratio; ref rated power Physical Specifi cations Dimensions (W x H x D) Net Weight Shipping Weight 150k//500p 120k//100p 446mV <+/-0.3dB 10 Source Z + 1k ohm >110dB (AWTD) ±5dB ±5dB ±3dB 2 x 180W (22.5dBW) 0.004% 220W (23.4dbW) 3dB 300W (24.7dBW) 520W (27.2dBW) 700W (28.4dBW) >150 20k ohm/ 680pF 1.38V 29dB +/-0.03dB >80kHz >107dB (AWTD) >130dB 17 1/8 x 5 1/4 x 15 3/16 (435 x 135 x 386mm) 51.8 lbs (23.5 kg) 67.0 lbs (30.5kg) Preliminary Specifi cationsPreliminary Specifi cations Preliminary Specifi cationsPreliminary Specifi cations