Choose wisely: This was my choice in the late 1980's and I am still using them.
NAD 2200 Power Amplifier PE (an AB amp)
Date of manufacture : Jan 87 - Feb 89
(I own 5 of these & one earlier non PE [Power Envelope or for those down under: Power Tracking]). I typically run one for my pair of subs in a 2 ohm configuration. And one on each channel in a bridged mono 4 ohm configuration. Yes, that takes up 3. Sometimes I also run one per sub in a bridged mono 4 ohm configuration. The spare amp rotates in & out of the system or does duty on other projects. All are subject to being replaced by the spare for various periods of time.
These have traveled the world with me (USA, OCEANA, Islands in the Indian Ocean, Saipan, Guam and many other places and operated under many different conditions). In 2016 I decided to have a look see, figuring that they were long in the tooth. Many things were done to bring them to the best specs possible (since I had commissioned to have them gone through) without outright changing any of the circuitry. The results can be seen in Amir's NAD 2200 Review. The only outright failure that I ever had was a speaker relay (from wear). There are the questions of will parts for whatever amplifier that you choose be available in 10 or 15 years? At what cost? And will there be technicians that can repair it?
IMHO: It is worth it to spend more money up front to have better quality/reliability of the parts than to be down & waiting to upgrade the lesser parts in an inexpensive amp. As to the box it is in, if you are not going to use it as a seat, it doesn't need to be billet.
I don't own a class D yet, as I am concerned about reliability.
POWER AMP SECTION
Continuous output power into 8Ω *
Rated distortion
(THD 20Hz - 20kHz)
Clipping power
(maximum continuous power per channel)
IHF Dynamic headroom at 8Ω
IHF dynamic power
(maximum short term power per channel)
Damping factor
(ref. 8Ω, 50Hz)
Input impedance
Input sensitivity
(for rated power into 8Ω)
Frequency response
Signal/noise ratio
THD
(20Hz - 20kHz)
Bridged Mode
Continuous output power into 8Ω *
IHF Dynamic headroom at 8Ω
IHF dynamic power
(maximum short term power per channel)
PHYSICAL SPECIFICATIONS
Dimensions
(W x H x D)
Net weight
Shipping weight
Power consumption
(120 ~ 240V, 50/60Hz)
* Minimum power per channel, 20Hz - 20kHz, both channels driven with no more than rated distortion.
Dimensions are of unit's cabinet without attached feet; add up to 18mm for total height.
Dimension depth excludes terminals, sockets, controls and buttons.
© NAD Electronics. All rights reserved. E & OE
100W (20dBW)
0.03%
140W
+6dB
8Ω
400W (26dBW)
4Ω
600W (28dBW)
2Ω
800W (29dBW)
>100
25kΩ / 1000pF
700mV
3Hz - 80kHz / +0, -3dBdB
ref. 1W
>91dB
ref. rated power
>111dB
<0.03%
400W (26dBW)
+5dB
8Ω
1.2kW (31dBW)
4Ω
1.6kW (32dBW)
420 x 123 x 370mm
12.5kg
14kg
770W