yes this is a dup. thread but I want an answer:

Can anyone explain these to me? I couldn't find an explanation on stereophile's site as to how they classify a speaker as A, B, C, etc. Are prices taken into account? I have heard there is such thing as Class A frequency limited, which I am assuming means it sounds good above 100 hz or some other arbitrary freq. If anyone can explain this to me that would be great, and especially if you have a link to stereophile's own explanation of their rankings.