JBL Flip 4 Bluetooth speaker review: Better-than-expected sound in a compact, waterproof enclosure

There's nothing quite like feeling as though you got more than what you paid for. That's how you'll feel if you drop a C-note on JBL's Flip 4 Bluetooth speaker. Small, easy tote, and waterproof to the point of being submersible, this speaker sounds like it's considerably bigger and much more expensive. It can easily fill a large bedroom with sound, and it can also hold its own outside. But the Flip 4 is more than just loud.