Classic Phantom pair - No low-mids, shoebox sound

[EmmanuelG]

Is there sound from the mid range unit at all? You'd easily hear when you put an ear close to the front of a Phantom.

Yes there is: I can hear and feel its vibrations with a gentle touch.

I tried mono listening of each Phantom to search for phase issues or only one of them's malfunction: no results.

I tried different places, from 60cm to 1,60m high, from 30 cm to 80 cm off the wall, and they sounded the very same. Sure in the middle the issue would remain.

have you tried a factory reset from the web interface page?
just to see if it is a software related problem or not.

How can I do that ? Is that a web page interface on each Phantom on the LAN ?