While in the speaker/electronics repair business; I saw quite a number of cheap(read, "junk") speaker systems, pass through my shoppe. Without exception: they all were crossed over with one cap on the mids(when applicable), and one cap on the tweets(6db/oct, 1st Order crossovers). Then to; they were(invariably) the least expensive aluminum and paper caps available. Ditto, for every console or portable stereo that I've ever seen or worked on. While the 6db/oct slope offers the least, in terms of phase shift in a x-over; that's not the system designer's goal, in the vast majority of cases(cheap, being the rule). The exceptions to this(of course) are the higher end designers, that utilize a cap costing(perhaps) fifty times the price of all the components in the other's entire system. KUDOS, to those. Leonardo de Vinci is supposed to have said, "Simplicity is the ultimate sophistication", and Albert Einstein stated "Things should be made as simple as possible, but not simpler." Were either into speaker design; they would probably use a 6db/oct slope, or a single driver system.
