I occasionally supply a Bluetooth-enabled CD player (Tascam CD-200BT) in a rack.
I've always tried to spec a plexiglas door to allow good reception at the front of the unit.
But now a school says they want solid steel door on the new Gymnasium rack because flying basketballs might break the Plexiglas. (Not worried about athletes hitting the rack, as it's tucked in beside the bleachers.)
Do you think the Tascam would receive the Bluetooth signal from Coach's iPhone if the rack is closed with steel door? Coach could be anywhere about the Gym, which is sized for a single basketball court.
I noticed that Denon DN-300Z CD/BT/AM/FM deck has a remote Bluetooth antenna. Never played with that model.
The 300Z is great.
The antenna is removable, but not 'remote' by default, however it is removable so you'd have to find an extension cable for it.
That should take care of your problem though
Jason