A Bluetooth speaker that sounds really great?

Sonos satellites and sub move in and out easily. We do it all the time when bbqing. Plenty of fidelity. Sub adds icing on the cake and easy to grab with one hand. We also have the big JBL disco boom box with the stand and microphones. More for the kids and karaoke and can blast from 50 yards away. Not my cup of tea. 

I really like my ultimate ears wonderboom.  It is surprisingly musical.  I tried using two for stereo, but actually, listening to one alone sounded better. Strange. It only does Bluetooth, not Wi-Fi.

Thanks for the recommendations guys; I will definitely check into the Boombox as that WiFi option sounds fantastic.

I have the Big Marshall. 

One note on the Audioengine B2 speaker -- it requires an AC connection. It is not battery powered. But it is a good speaker for its size and cost.