Back to spiker's question, there's a lot more going on than simple number and size of drivers in a speaker. The single 8" driver in a three-way speaker could potentially achieve better bass response than a pair of 5.25" drivers in a two-way speaker, but factors such as the quality of the individual drivers, the enclosure designs, and the crossover designs (just to name the ones that occur to me) could just as easily yield better extension for the two-way speaker. The number of drivers in the two-way speaker becomes just one of many contributing factors.

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