HTPC - Logitech Z-5450 Wireless Speakers - Ceiling mounted speakers

[oz_surfer]

I have built a custom Win XP HTPC, with 6.1 audio card and Logitech Z-5450 Wireless Speakers.

I would like to add around 4-6 flat ceiling speakers @ 300mm diameter. Can this be done and hooked up to the HTPC?