Thanks, Petros - so now we know
MM
There is a tv - and there is a BV.
The idea of BeoSound Shape is upmixing a stereo signal to the true image band on the wall. This is done by BeoSound Core in which the upmixing algorithm is essential. For what use is then a two channel speaker output on PL or optical useful? BeoSound Essence provides the same sources as the Core and you don't have to pay for the upmixing. I regard PL and optical input to the Core much more useful. Then I could connect it to my BeoSound 9000.
The upmixing is not done by the BeoSound Core, but by the BeoSound Shape amplifiers. If you have a "small" setup with up to 4 speakers, you could skip the BeoSound Core and just connect your BeoSound 9000 via powerlink. The amplifier is "pre-configured" for the upmixing and distributing to 4 speakers. However, if you go to higher number of speakers / amplifiers, the BeoSound Core is used for passing the correct settings to the amplifiers. So, in that case (of more than 4 speakers) you would need a BeoSound Core, at least of initial configuration of the BeoSound Shape and assignment of roles to the different speakers / amplifiers, based on your individual shape.