Three, Denon (Envoi), Marantz (Voice Rover), and LD systems (Road Buddy).

Twice I A' B'd the Marantz and the Denon.. After Sam ash guys said there is a sound difference...

I found also that the Marantz was warmer .. where as the Denon was brighter (harsher slightly)... same settings and same playback device.......via Bluetooth.
I cannot rule out that maybe they had different preset EQ set for Bluetooth..(7 presets)..

Also the bass response was better on the Marantz (again maybe preset EQ was different)..