The Ultimate Ears speaker lineup is getting quite crowded, having now reached six products with the recent introduction of the $249.99 Everboom. This speaker is a smaller, more portable take on the Epicboom that I reviewed late last year. And its core appeal is the same as any other UE speaker: you’re getting a rugged, waterproof speaker that’s cut out for both indoor and poolside parties. You can link the Everboom up with other UE speakers in party mode to play music in sync across all…