May I suggest another shelf set like you have, side by side, or one large enough to fill 3/4 of the space. Then I'd add just a few light weight accessories among silk plants on either side of the TV and more silk plants on the floor close to your speakers. This will help give your shelving more 'foundation' so the TV doesn't look visually like its top heavy.
Although real plants are much more desirable, they do not make great companions for TV systems. But please choose silk that has some variation of colour in its leaves.
Displaying your viewing paraphernalia in an artful manner will make it more interesting, especially if you add an occasional art piece or picture frame.

TV is too large for the shelving you have now. I would as Iconic suggested either add another or get a wider one. And also because it is clear it doesn't anchor the TV so bring the speakers in next to the shelves. I would skip silk plants but that is just my taste showing.

wonderful ideal, will try it...

I thought that this could be brilliantly implemented and your speakers and media integrated within the units or on the walls - hope this helps you to create something spectacular :) Val

looks nice, thank you..