Open baffle Sphärisch BOB use fullrange driver and bass driver.
Our first fullrange driver used here was FOSTEX type FE206En. It is made from bamboo paper. This driver is connected without a turnout.
Now we prefer driver with higher Xmax and Qts. For example SEAS Prestige or Exotic, TangBand…
As bass is used one of the few large drivers suitable for this type of enclosure that can currently get. Eminence Alpha 15A is connected through a low passage with only 6 dB increments to minimize components in the signaling path. It is only an inductor of 1.4mH induced by a 2mm2 wire.