Go

Avoid the smaller turtlebox, go for the grande. It’s my current go to boat/outdoor speaker.  I’ve had multiple JBL boombox/party box’s and both the soundboks 4 and Go(loved both) but the turlebox grande fits the loud and portable niche well. 

Turtle box Grande. I have had the JBL party boxes, boombox3, wking, soundboks 4, SB Go, and no the turtlebox. The go was the best sounding in that environment, but lacked  being waterproof and salt spray long term was going to be an issue. The grande is 90% of the go’s sound while having better battery and a smaller footprint. There ARE other speakers that sound better, you’re not going for that, you want loud and tuned to cut through wind.  Turtlebox is very gimmicky/lifestyle as a brand and the OG turtlebox sounds terrible, but they dis make a good product with the Grande.

We did unforgettable after hour parties already - and when two Soundboks met, even better. But yes, I'd love to hear both / all five(?) systems in comparison. And in a better world, they would be cross-compatible anyways.

Check out the Soundboks Go. I have the full size Soundboks and nothing else even comes close although it is a bit big and heavy.

I have 3 Soundboks speakers, the SB2, SB3 and the SB Go. They all do very well for movies. Matter of fact they might be exactly what you're looking for, because they go extremely loud and don't have that deep Partybox bass. So here's my last suggestions, the [Soundboks Mix](https://soundboks.com/products/soundboks-mix)

Check out the new soundboks mix. A whole lot better sound than the old go and even the 4, because of the new tweeter. Wont get as loud as a 4, but much nicer sound and more portable size. Its size/weight is like a jbl 120, but it gets louder, is more durable/waterproof and better battery life.