I purchased a pair of Flip 4 to use in my Personal Fitness business when doing bootcamps in a gymnasium. Surprisingly, the pair of Flip 4's deliver great sound, and my class can still hear me fine as I shout out instructions. I pair them up, put them in stereo mode, and have them connected to my phone for easy volume control while I'm running around the gymnasium leading the bootcamp workout. At about 70% volume, they are loud and clear (I'm guessing 70% by the number of bars on my apple
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I also use the pair in a massage therapy room, where they deliver clear stereo sound and music during massage therapy sessions.
My only complaint, is that sometimes I'll hear some static, but not sure if it is due to low battery, poor internet connection, or poor bluetooth connection between phone and speakers. I usually let speakers run to about "1 dot" before charging. But I would say that 99% of time, sound is clear and no static. I would still recommend.
Very happy with speakers. I recently took the pair on a road trip in my 4Runner, and loved the sound for both music and audio book listening.
This review was originally posted to jbl.com.