Hi guys, Welcome to the Advanced Video Search Engine, and you are watching 3D printing loudspeakers - RD Physics FR1 and FR2. That video is uploaded by DIY Audio by RD Physics at 2021-03-10T03:38:52-08:00. We are promoting this video only for entertainment and educational purpose only. So, I hope you like & enjoy it. [8SzxSlkaeaM]