Interesting info on Subwoofer tech

[kaptein oubaas]

https://www.facebook.com/SVSound/videos/1239298812825421/

or

https://www.svsound.com/pages/16-ultra-series?utm_source=SVS+Newsletter&utm_campaign=e5c9f7bd18-Newsletter_January_2017&utm_medium=email&utm_term=0_932c6e125c-e5c9f7bd18-79807257&mc_cid=e5c9f7bd18&mc_eid=ca2407d11c#janlittleguys