Thank you gavman for that very helpful information.
I can say that my DIY boxes do seem to be as good as the Entreq Silver Tellus (if perhaps better). I have done a lot of research, and a lot of trial and error in the ingredients that I chose for my DIY versions. Combined they all make a big difference in the sound depth and all the other attributes you have referenced. With the Entreq and my 3 DIY versions I have been able to separate digital, analog and speakers.
All that being said I would like to try a Tripoint unit someday, but they are a little costly,
ozzy