A Bluetooth speaker that sounds really great?

+1 on JBL Boombox portable wireless blue tooth waterproof, cary it anywhere, yard work, garage, around the fire, down on the dock   Holds charge for days and days.

Get the big one, Boombox 4 is current model.   They go on sale for -100 often.

i have a small one for travel.

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.