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I'd expect there to be a crossover to the sub built in, even though these are passive xovers. Still, whether or not that was the design, Ima try hooking up my Blue Sky sub just for fun.

By the way, Manny LaCarubba (Sausalito Audioworks), who's as good a speaker designer as there is, uses subs in his systems. The twist is that he uses multiple ones, not just a single one. So it's not just that era!

problem with multiple subs is that unless the subs are located right next to each other, there will be areas in the room (or space) with destructive interference and other areas with constructive interference.

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