Agreed, however there's clearly a balance here between something like turning milk into butter and patenting the maglev train. If you develop a sophisticated way that is unmatched by your competitors in which wireless speakers can transmit radio signals carrying audio. In a way that has little interruption across weak WiFi signals throughout a home and that's purely your business and innovation platform. Then I see no problem in it.
Heck Apple have a patent for a paper bag... my point is that its not necessarily about patenting turning milk into butter, but if you find a way to do it better than anyone has and you are a business that has put all of your R&D into perfecting that process in a market of other butter makers, then its fine. If they want your invention they can pay for it.
