Setting a speaker to large will mean that it ignores the crossover. Setting a speaker to small means that it will be using the crossover to redirect low frequency to the sub. If a processor has a single crossover point, all "small" speakers use that point. (Many processors in the past had only a single crossover that was typically not adjustable -- fixed at 80Hz or 100Hz. Systems like that would match your description of crossover / large speaker / small speaker fairly closely.) With the 1066 (and the Model 1050 receiver, as another example), the crossover can be adjusted, but all "small" speakers sill use that same crossover point. The 950's "triple crossover" lets you have a little more flexibility. Say you have a pair of large bookshelf speakers (Paradigm Ref. Studio 40's, for example) that can perform well down to say 40Hz, but your surrounds really can't get much below 100Hz really well. The triple crossover lets you select 100Hz for the surrounds, 40Hz for the mains, and perhaps 80Hz for the center.

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