OT: Playing GiP data wirelessly.

[Budge]

Please indulge my OT question but some on this list are far better 
qualified to answer.

My problem is trying to play music to a large and oddly shaped room 
which is mainly circular with a conical ceiling and masonry walls in 
which two loudspeakers are not sufficient.

Leaving aside the complexities of multi-channel systems for now and just 
considering a normal stereo signal, how may I achieve channel separation 
and playing on different sides of the room.

There is power available at all the locations where a speaker might be 
placed but absolutely no way any cables can be trailed between 
speakers.  In other words I need a wireless system with in-built 
amplifiers.  I am assuming Bluetooth but could use wifi. The problem as 
I see it is that I only want one channel at each speaker.

Of course I could just use a combined mono signal and that may be the 
answer but hope some here will have better ideas and if multi channel is 
feasible I would welcome further advice.

Regards to all after long periods of absence from these pages,

Budge