The reason Cube (and most companies) do not make open baffle speakers is that it is not an easy sell. The baffle needs to be large, you need space behind the speaker or you do what Nelson does and add woofer below. They are selling a look....a lifestyle......slickness....they are not selling super hot rods.
Look at the crappy wire and banana plug Nelson is using....he is not a tweak, for sure......no Ground Enhancer, No Bybee, no wiring directly to the voice coil wire.....and not good wire......probably has the same banana things on the amp end of the speaker wire.....you know...so he change change wires or amps real fast.....Hot rodding is so easy.....and takes so little time....and the sonic rewards are amazing..........but, he just has no interest in it. He even told me so.