Stereo Magazine - Directional subwoofer Conventional loudspeakers usually radiate low frequencies spherically, i.e. in all directions. ModalAkustik now produces a subwoofer that radiates the bass specifically to the front. It is called "
Open baffle (ripole) subwoofer in an unusual form factor? | pink fish media
Bad news for Ripole sub builders :-( | diyAudio
Vox Sub D15
Ripol nach Axel Ridtahler • vintage-audio Restaurierung aus Passion
RiPole Subwoofer
Test: Modal Akustik Musik Bass - Der knackige RiPol Subwoofer › HiFi-IFAs, Der Blog: Audio, Stereo & High End Magazin