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Stereo Power Amplifier

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NAD C 275BEE Details

NAD C 275BEE Stereo Power Amplifier: Greatly reduced noise and distortion
  • 150W x 2 Continuous Power into 4 ohms and 8 ohms
  • 250W, 410W, 600W IHF Dynamic power into 8, 4 and 2 ohms, respectively
  • PowerDrive™ circuit
  • Holmgren Toroidal Power transformer
  • All discrete circuitry
  • Class A Voltage Stages

The NAD C 275BEE 150-watt power amplifier boasts many upgrades and refinements taken directly from the highly acclaimed NAD Masters Series M3 Amplifier. These include application of Bjorn Erik Edvardsen's innovative and patented Distortion Canceling Circuit in the output stage and BEE Clamp in the power supply.

A carefully engineered PCB layout has reduced distortion and noise to unprecedented levels. Taken together, these improvements mark a sharp upturn in performance that simply must be heard to be fully appreciated!

Named an "Outstanding Product" by Hi-Fi News
The NAD C165BEE preamp and C275BEE power amp together won an "Outstanding Product" award in the September 2009 issue of England's Hi-Fi News magazine. "Given its price, it clearly represents classic 'budget esoterica': first class high fidelity for only a second class budget price."

PowerDrive design
The C 275BEE benefits from NAD's proprietary PowerDrive circuit topology, now well established and used throughout the NAD product range. PowerDrive allows the C 275BEE to deliver maximum performance under virtually any circumstances, independent of the loudspeakers it is driving. The circuitry automatically senses the impedance characteristics of the loudspeaker and will then adjust its power supply settings to best cope with that specific load.

PowerDrive is a practical approach to enable an amplifier to easily deal with musical dynamics and difficult speaker loads. It delivers the highly desirable characteristics of high dynamic power and low impedance drive capability in one affordable package.

Fast wideband amplifier stage
Getting high dynamic power from the power supply to your loudspeaker requires a fast wideband amplifier stage rugged enough to pass and control high peak currents without premature protection intervening. The safe operating limit for the C 275BEE has four times the capacity of the typical amplifier in this price range by using four pairs of 220W output transistors per channel.

Lowest levels of distortion and noise
The C 275BEE has the lowest levels of distortion and noise available in its price class and is easily capable of embarrassing far more expensive products. To prove it NAD uses Full Disclosure Power, the most demanding criteria for performance measurement. FDP specifies distortion under the most extreme conditions of low impedance loads and frequency extremes rather than the simple and easy 1kHz @ 8 Ohms test quoted by many of our competitors.

NAD uses this stricter performance criterion because it more closely matches the demands of real music and real loudspeakers. Maintaining specified distortion at 4 ohms and at 20 Hz and 20 kHz is several orders of magnitude more difficult to achieve than the simple 8 ohms and 1 kHz test.

Bridge option for more than double the power
While 150 watts-per-channel is very powerful for home use, there can never be too much power if you like your music loud and clear. An option to add more power in the future is to 'bridge' the C 275BEE and add a second C 275BEE for one of the most powerful home audio systems you'll ever encounter. Power goes from 150W x 2 to over 400W x 2! This also has the additional benefit of being 'dual mono', meaning each channel and each speaker is totally isolated from the effect of the other.

Real-world power specs
NAD takes a stand against the meaningless 'brochure power' touted by many of NAD's competitors by offering Full Disclosure power specs. NAD specifies minimum continuous power, across the entire audible range of frequencies, at rated distortion, for both 8 and 4 Ohms with all channels driven simultaneously. Perhaps even more importantly, NAD also specifies dynamic power at 8, 4, and even 2 ohms, which better describes the way the amplifier will perform in the real world, with musical signals and reactive loudspeaker loads.

Less distortion means more music
Noise and distortion mask the fine details of a musical recording robbing musical texture and dimension and replacing them with non-musical artifacts. NAD has spent the last 35 years perfecting their designs to have the lowest distortion and highest power in their price class.

NAD's competitors often rate distortion at only 80% of rated power, and even then can't match NAD's very conservative spec of 0.009% at any frequency within the range of human hearing. The noise spec is often 10 dB (100 times!) less than that of competing amplifiers. This is far from a trivial difference as fine detail and nuance (micro dynamics) are often obscured by noise in lesser amplifiers, robbing a performance of that illusive sense of 'realism'. It is that exciting feeling of being there at the live performance.

Custom Installation-ready
The C 275BEE is equipped with NAD's ATOLogic circuit which includes both a 12V-trigger system and signal-sensing turn-on option. This extra level of flexibility makes it easy to integrate the C 275BEE into automated control systems or simply enjoy the extra convenience of auto turn-on. Consumption is a very low <1W when in Standby mode.

Additional Information

Name NAD C 275BEE
Sub Title Stereo Power Amplifier
Manufacturer NAD
Manufacturer Part# C 275BEE

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Continuous average power output into 8 ohms: >150 W (ref. rated THD, 20 Hz – 20 kHz)
Rated distortion (THD 20Hz-20kHz): <0.008 % (ref. 20 Hz - 20 kHz)
Clipping power (max cont. power/channel): >170 W (ref. 1 kHz 1% THD)
IHF dynamic power: 8 ohm, 250 W (23.42 dBW); 4 ohms, 410 W (25.31 dBW); 2 ohm, 600 W
Damping factor: >180 (ref. 8 ohms, 50 Hz and 1 kHz)
Input impedance R and C: 100 k ohm / 100 pF
Input sensitivity (for rated output into 8 ohms): 1-2V
Voltage gain: 29 dB
Signal to noise ratio, A-weighted:, >102 dB ref. 1W; ref. rated power, >123 dB ref. 150W

Bridged (Monophonic) Mode
Continuous average power output: 8 ohms, 800 W; 4 ohms, 1200 W

Physical Specification
Dimensions: 17-1/8" wide, 5-1/4" high, 13-3/4" deep
Weight: 32.2 lb.