"This page ranks 42 party size Bluetooth speakers. If you’re looking at one of these, you need very deep bass or extreme loudness and can accept a large, heavy speaker. Most are overkill for typical use, the Boombox size is better for most people. Most are at least IPX4 unless noted. All need AC to charge. The best here have bass extension similar to a 10” woofer tower speaker."
my note: page has many links to youtube tests, and resources, does not seem to be advertising-related, though is biased towards JBL.