Low end bluetooth devices usually go up to 10 meters, but this is an high-end product, it might go up to 20 meters.
However, I'm not too sure about that as I don't own those speakers ! It's quite expensive so you might ask someone who owns those. Still, there's a 3.5 jack input so you might use it.
Perhaps the RuarkAudio MR1will suit you.
These are small 2way speakers that are amplified and got blutooth connection for 400$.
http://www.proporta.com/ruark-mr1-active-bluetooth-speakers
You'll then need a bluetooth key on your PC.
You can add easily a subwoofer thanks to the subwoofer...
First post here, nothing fancy, just cheap yet good stuff.
Speakers : Prodipe Pro8v2
USB Audio Interface : Focusrite Scarlett 2i4
Mic Preamp : ART Tube MP
Mic : Shure SM58
I know that the speakers are big, I need stands for them.