Only the Ecoboost engine has sound pumped through the speakers. The 5.0 has the tube.
I could do a search and find documentation on this but I am leaving that for you to do.
Yeah I don't know where this info is coming from but my 16 does not. If it was coming through the speakers it would be louder the closer you are to the actual speakers and I can attest that it is not. Don't know about other years, models etc but my Eco does not.