As usual on this topic, you see people speaking up and comparing amps apples to oranges.
Depending on the efficiency of the speakers one uses, if very efficient, you probably won't need a 200 WPC amp. Then a light 15 WPC clean amp works well and it won't weigh anywhere near what a class A 200 WPC amp would weigh.
no matter how certain people try to get around the fact that electronic equipment is "engineered" and science and technology is absolutely present, they try to make one believe that technology and science aren't a part of it at all. mostly because they don't understand it.
Not taking anything away from Class D amps, if you stick with class A or A/AB amps, you are dealing with linear power supplies , large capacitors, heavy enclosures, heavy heat sinks. most of this is based on the science of power supply design and heat sink design necessary to get rid of unwanted heat from output transistors.
But, if space is an issue and you have efficient speakers, then by-all-means try Class D amps. they are lighter and getting close to well designed class A or A/AB amps. not there yet, in my opinion.
But, not everyone wants really heavy, large amps, so they are opting for lighter amps and more efficient speakers that don't require large output amps.
Well made transformers are not light or inexpensive. high voltage capacitors are not small. large output transistors require sufficient heatsinking.
shortcuts will result in lesser sound quality.
But, it depends on you and what you have (speakers, rooms size) and the sound quality of the music you prefer. Oh, and also, your budget.
enjoy
