I haven't got any experience using the BRAVEN BRV-X, but I heard the BRAVEN BRV-1 Waterproof Bluetooth Speaker is good. This one was even included in some of the professional gadget reviewers lists for the Best Waterproof Bluetooth Speakers of 2019. This Bluetooth speaker can be completely submerged underwater for up to 30 minutes with its IP67 protection, it is also shockproof and delivers 3W audio output with a 70mm passive hoofer. With a battery of 1400mAH, it can last for up to 12 hours of play time and also doubles as a power bank as they were saying. You might want to give it a try if you're still looking for waterproof speakers.