Outdoor Garage Speakers

I presently have Bose AM 5 series one speakers mounted on my garage and want to upgrade. I definitely need more bass but don't want to go too big. They are mounted underneath on sides of garage. I am running 130 watts into them. My yard is roughly 400 square feet of decking plus rest of yard. Any suggestion greatly appreciated.......

Budget is approx half $500.

regards Bacardi