I’ve been a fan of Altec Lansing most of my life, largely stemming from the sonority of the company’s 15-inch 421A speakers that were a preferred woofer and bass guitar speaker for quite a while back in the ‘60s and ‘70s.

Whether that Altec Lansing company really has anything to do with today’s entity, I can’t tell you, but I do like the sound produced by its $100 Mini LifeJacket III. Rather a lot, I must say. This is a ruggedized and waterproof Bluetooth portable speaker with an IP67 rating, meaning it’s impervious to dust penetration and that no harmful amount of water will enter its enclosure when submersed in water down to one meter.

Fidelity

Nearly all the portable Bluetooth speakers I’ve tested have noticeable hot or dead spots frequency-wise. Some accentuate bass, some the mid frequencies, some lack top-end, and so on. The Mini LifeJacket III sounds relatively flat throughout most of the spectrum, with just enough extra top-end to give it some sizzle. There’s mild thump, but it’s not over-emphasized and it leans heavily toward the low mid-range. That may make the kids sad; then again, perhaps they’ll appreciate being able to understand the lyrics.
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https://www.macworld.com/article/3066814/speakers/altec-lansing-mini-lifejacket-iii-review-this-rugged-bluetooth-speaker-isnt-just-water-resistant-it.html