Full range for listening to music in my opinion bottoms somewhere around 40Hz. Very seldom do actual instruments go below that. Exceptions are church size pipe organs + synthesizers, neither of which I listen to. To hear all of a bass guitar and even a bass drum though, Full size speakers sound much better in my opinion, especially outside, unless they’re 20 yrs old like mine are.
Movies are another story, explosions etc, but I won’t be watching movies outside.
I currently have 20 yr old full size 3 way pioneers (top of the line in their day)in my garage/shop that I put outside when it’s nice out and they work just fine range wise, but their age shows – muddy bass from yrs of beating up the 12” drivers. Plus they’re a pain to move around.
So this is going to be a challenge, b/c even if they made a pair I liked, I’d still have to figure out how to secure them enough to keep them from getting ripped off. Or just get indoor speakers and live with the extra 10 min of work every time I want to listen…