Audiophile Setup with an Iphone 7

Thanks for the link. I read the Darko piece, but note (not for the first time) that he presents no hard evidence for what on theoretical grounds is a pretty implausible argument. I honestly do not think he is someone to take very seriously. Anyway, that is my take. See here for what I think is a far more solid review: http://archimago.blogspot.nl/2016/02/measurements-google-chromecast-audio_27.html

I am very pleased with my Pro-Ject Dock Box S Digital. Manufacturer's website:  http://box-designs.com/main.php?prod=dockboxsdigital. It is a discontinued product, but as of January 2018 Amazon still had a few at $199.00 US. The internal DAC is very good and the sound quality is noticeably superior to the iPhone 7's internal DAC or a bluetooth connection. The included remote is somewhat useful. Nice feature is that the phone charges while docked.

I bought mine a few years ago to replace an Arcam rDock-uni (which sounded even better), Unfortunately, I fried the Arcam by connecting it to the wrong DC adapter (DOH!) and repairing it was going to cost almost $300.

I use mine connected to an Exposure 2010S integrated AMP, B&W 705 "bookshelf" speakers, and a B&W ASW 700 subwoofer. 

Dear Gentlemen & Ladies,

Thank you all, once again, for such an interesting and informative discussion. It is being very useful...much appreciated all your contributions !

Best regards