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Back in the 70's I recall most speakers were sealed boxes. Today the vast majority are ported, except for subwoofers where sealed boxes compete with reflex designs. Offhand, the BBC mini monitor replicas are sealed and so are the expensive Magico line. There are also passive radiator designs. While there are not that many, they are a bit more mainstream with speakers from KEF and Goldenear, among others.
My personal hunch is ported speakers can be built with smaller cabinets, and cabinets are expensive. Likewise, a passive radiator costs more than drilling a hole in the box.
My personal hunch is ported speakers can be built with smaller cabinets, and cabinets are expensive. Likewise, a passive radiator costs more than drilling a hole in the box.