4.1 does NOT have dolby digital, 5.1 does and has bass redirection. ive never used the Kx driver but 5.1 does have better quality if in 5.1 mode. if u have 5.1 speakers, its possible to make a 5.1 emulated sound channel, but live 5.1 gives true 5.1 i dont know what the kX driver does nor do i care
