It's easy to see why the likes of Sony might look at JBL and Ultimate Ears' lineup of extremely rugged portable Bluetooth speakers and want in on the game. Many of the best Bluetooth speakers can now be relied upon in bad conditions as well as the home, after all – people are almost starting to expect it.
So, it's fleshed out its growing ULT range with the ULT Field 1, an impressively powerful little speaker that I've been using for a couple of weeks for this review. But can it act as a serious rival to more established options in the rugged market?
