The BL5 calibration is quite different than this and is also internal to the speakers.
For this you need to go in to the B&O settings of the tv, sound & beolink, speaker groups and then pick the speaker group you have the 3's active in and then select speaker level. Then you'll hear a white noise in the selected speakers, take out your phone with any DB app and turn the volume up to your normally used setting. in the speaker level menu adjust each speaker so they play at the same volume at your seating position.
This ensures that each speaker is at least producing the same sound level at your seating position and the requested volume level. Does that make more sense?
