A Bluetooth speaker that sounds really great?

Couple years ago when Amazon had there yearly big sale, I bought a Bang & Olufsen Beolit 20. It's rather pricey, but sound quite nice.

I generally avoid apps, but the  Bang & Olufsen app allows custom tone adjustment. 

@audio-oldie ,

We have a DemerBox for outdoor use and extreme abuse on our whitewater raft. We bury the thing in water on a regular basis without issue.

They sound great (with the option of an open or closed port) and can be paired together with other DemerBoxes. The batteries seem to last forever, and can charge your device while you’re using it. 

www.demerbox.com

I have two Sonos five speakers configured to stereo on the patio and they sound great

my apologies the Sonos five speakers run on Wi-Fi not Bluetooth

I have a JBL Flip 5. Nothing, absolutely nothing the size of a beer can has a right to sound this good.

Say what you will about JBL, those Harman research dollars aren't spent in vain.