I have two solutions implemented for this in my house.
I have a B&O Master Link Distributor box, and I have B&O Wireless.
You can buy the B&O ML Distributor from your dealer - it is small (8.5cm x 14 cm x 2.5 cm [without cables, plus]), black and made of plastic - it is meant to be hidden away, and requires no power.
The B&O ML Distribuor has the following ML ports:
- Audio
- Video
- Link 1
- Link 2
- Link 3
- Link 4
My ML Distributor box takes my Beosound 4 ML cable and connects it to my Beoport ML and also to my B&O Wireless Trasnmitter by ML ... it could also connect to B&O Active controllers via ML or to a B&O TV via ML when I get one.
My B&O Wireless Transmitter sends signals to 3 B&O Wireless Receivers - each drives my speakers: BL 6000, BL 3, BL4.
Note the B&O Wireless units are switchable between Transmitter and Receiver.
The B&O Wireless unit is approximately the same cost as a B&O Active unit - it has (imho) a lower quality sound (and in my house gets zapped by the microwave) but it gives me flexibility on where I position the speakers and I don't have to worry about where I run my cables.
For my outdoor music I open one of two doors and crank up the volume on the BL 3s or the BL 4s ... or I could pick up the Wireless Receiver and its BL 4s and take them outside (I have an all weather power socket by the BBQ).
First B&O (1976) was a Beogram 1500 ... latest (2011) change has been to couple the BL11 with the BL6Ks *sounds superb*