Different designers have taken different approaches to dealing with what might be the greatest problem faced by all box speakers - the internal pressure behind the cone.
Some go for ported designs like Harbeth with their proprietary radial cone material.
Some go for sealed boxes like ATC with their highly acclaimed midrange unit.
Others, like the fabulous Kerr Acoustic K320s I heard a couple of months ago feature transmission line loading. As do the highly regarded PMC brand.
And then there's some who go for partial or total open baffle designs. There was a lovely sounding model from ProAc a few years which had nothing behind the midrange. It's difficult to think of any popular open baffle designs but the Linkwitz LX521.4 and the previous model the Orion must be in the running also.
Some go for ported designs like Harbeth with their proprietary radial cone material.
Some go for sealed boxes like ATC with their highly acclaimed midrange unit.
Others, like the fabulous Kerr Acoustic K320s I heard a couple of months ago feature transmission line loading. As do the highly regarded PMC brand.
And then there's some who go for partial or total open baffle designs. There was a lovely sounding model from ProAc a few years which had nothing behind the midrange. It's difficult to think of any popular open baffle designs but the Linkwitz LX521.4 and the previous model the Orion must be in the running also.