For price and size (low) against quality and voume (high) you can't get anywhere near the Galaxy Hotspots.
The smaller little ones are actually louder than the bigger little ones, but only have treble and bass (no mid).
Two channels, XLR and 1/4" Jack, and they'll drive a passive monitor too.
If you're happy with mono get a powered one and a passive one. They don't clip together, but they go nicely in a small rucksack or even a big shoe bag.