I am the original owner of this amp and even though it has never given me any trouble I had it serviced in Dec. 2007 including upgrading the relays, replace the input caps and modify the power circuit to give a smoother sound with better bass dynamics. I had two of these units at the time and this one came back sounding clearer, with deeper tighter bass.Check out my feedback on Audiogon & Ebay under the same moniker. This is a wonderful classic amp. Usually 100 wpc but if you bridge it you get 400 wpc. Anyway the dynamic power is enormous, up to 1600 watts!. The 2200PE was the most powerful amp NAD made until the 2600 Monitor. Frankly I believe the 2 are nearly the same if you compare the specs! From the original ad: (If ever an amplifier could be said to be “digital ready,†this one can. Its readiness is not merely a matter of being louder than other amplifiers, although not many others could match it in sheer decibel level, but of its virtual immunity to overload with whatever program peaks an amplifier might encounter, even on Compact Discs.). This unit is in very good condition, I just pulled it out of my system about ten days ago so I know that it is working as it should. The cosmetics are above average, a couple tiny nicks on the top of the front face. It functions beautifully and runs relatively cool under load thanks to the enormous heat sinks inside, not having a fan is a big plus IMO. It is extremely quiet no buzz or hum and works best driving low efficiency speakers. It is ready to go for many more years! I will include the owner’s manual and Stereo Review test. I can also email the service manual. I will ship it insured and double boxed for safe delivery. I only charge for actual shipping costs, not the materials. This is a heavy unit about 35# so I will only ship in the U.S. and Canada. The Key: Real-World Design
Examined from one perspective, the 2200PE is a very conservatively rated 100 watts/channel power amplifier that has an extraordinary +6 dB of dynamic headroom, meaning that it can produce more than four times its rated power during musical transients. Looked at another way, the 2200PE is a super-amplifier that produces between 400 and 800 watts per channel for music (depending on speaker impedance), but contains an “intelligent†power supply that gives it the modest size, heat dissipation, and cost of a conventional 100 W/ch amplifier. The key to the design of the 2200PE, as with all NAD amplifiers, is that its design goes beyond conventional specifications and laboratory tests to provide optimum performance under the conditions of everyday use, NAD amplifiers are designed, first and foremost, to reproduce the dynamically varying waveforms of music-not just sine-wave test tones. They are designed to deliver undistorted power to loudspeakers of any impedance-not just to an 8-ohm test resistor. NAD’s engineers have always recognized the importance of supplying high levels of output current to drive the low and complex impedances of real loudspeakers. NAD premiered the use of Soft Clipping™ in solid-state amplifiers to prevent harsh distortion when the demands of the musical signal exceed the amplifier’s limit. This feature can be turned off if your listening involves moderate peak power levels. All NAD amplifiers feature high dynamic headroom for the transient sounds in music. The NAD 2200PE is a truly “dynamic†power amplifier. Its heart is the unique PowerTracker control circuit (patent pending), which automatically adjusts the amplifier’s maximum power output according to the dynamic character of the signal that is being amplified. As befits a product designed for the reproduction of music, the NAD 2200PE achieves its maximum power output of 400 to 800 watts per channel when amplifying wide-range musical signals that contain peaks IO to 20 dB above the average level. But when the amplifier is fed a high and constant signal (i.e. a sine-wave test tone instead of a musical waveform), its maximum output automatically declines to avoid overheating, and eventually levels out between 100 and 200 watts per channel. High-voltage, high-current design
Current flowing through the voice-coil is what causes a speaker to produce sound, and NAD was the first manufacturer to emphasize the importance of high output current capacity-unrestricted by so-called protection circuits-to cope with the complex, reactive impatience that many speakers present. The NAD 2200PE can produce peak output currents exceeding ±50 Amperes on demand, together with peak output voltages of ±95 volts to handle the most dynamic signals. Bridging
The NAD 2200PE is so powerful in the normal stereo mode that few listeners will ever need more. For special situations the two channels of the 2200PE can be bridged to form a mono amp of truly immense power by just a switch on the back. Its rated continuous sine-wave output is 400 watts, while its dynamic power output exceeds 1200 watts into 8 ohms and 1600 watts into 4 ohms.
Two 2200PEs in bridged mode (delivering over 3 kilowatts into a pair of 4-ohm speakers) would cost about the same as an ordinary 400-watt amplifier. Specifications POWER AMP SECTION
Continuous output power into 8 ohm 100W (20dBW)
Rated distortion (THD 20Hz - 20kHz) 0.03%
Clipping power (maximum continuous power per channel) 140W
IHF Dynamic headroom +6dB
IHF dynamic power (maximum short term power per channel) 8 ohm 400W (26dBW)
4 ohm 600W (28dBW)
2 ohm 800W (29dBW)
Damping factor (ref. 8½, 50Hz) >100
Input impedance 25k½ / 1000pF Input sensitivity (for rated power into 8½) 700mV
Frequency response 3Hz - 80kHz / +0, -3
Signal/noise ratio ref. 1W >91dB
ref. rated power >111dB
THD (20Hz - 20kHz) <0.03% Bridged Mode
Continuous output power into 8 ohm 400W (26dBW)
IHF Dynamic headroom at 8e +5dB
IHF dynamic power (maximum short term power per channel) 8 ohm 1200W (31dBW)
4e 1600W (32dBW) Physical Specifications
Dimensions (W x H x D) 420 x 123 x 370mm
Power consumption (120V 60Hz) 770W
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