On Sun, 30 Jun 2019 06:07:08 -0700 (PDT), Jeff Urban
wrote:

I prefer to use a hi-fi or entertainment contrivance that already
has proper external speakers and better bass/treble controls.

Bass and treble ? I have a design that will blow your mind.
If your public email is good I'll send you the print.

Are there graduate lab students or corporate scientists whove seen it and its results? Who are they and what are their findings?