( translated with Google translator)
665g an ultralight acoustic diffuser
It is technically possible to construct a very good light, omnidirectional loudspeaker on the entire audio band and with a realistic sound field, which can be realized with cheap materials that are easy to find and process.
(EP3243334) WAVEGUIDE ACOUSTIC DIFFRACTING DEVICE Application for filing of the European patent for: waveguide acoustic diffractor.
(EP3022945) WAVE-GUIDE ACOUSTIC TRANSFORMER - Application for filing of the European patent for: wave-guided acoustic transformer.