To dealers who want to test the Entreq products, I systematically suggest to start with connecting the negative speaker input with a silver minimus. They all come back enthusiastic about the test.
So, for me, the obvious answer to your question is: yes, connecting speaker input is like a minimum you can do yielding unvariably a very positive effect.
Should it be separate boxes? Yes, very much preferred but it does not have to be Olympus minimus neither.
The sonic benefit is quite diverse actually but also speaker dependent: less glare in the treble, better tonality overall, tighter bass, lower noise floor yielding better micro-dynamics and wider sound staging.
Thank you for all responses
I will be.working soon with PO for getting some things bettered.