Panasonic SC-TMAX towers

[Pogre]

Remember outdoors sound is different as it carrys further. If it were me I'd probably go with something like a JBL EON 10 and use a phone or laptop to as the source, in mono.

JBL EON610 | 10" (25 cm) Two-Way Multipurpose Self-Powered Sound Reinforcement

The EON610 leverages the latest technologies in cabinet materials, acoustic science, transducer design and user friendliness that delivers the extraordinary quality of a high-end studio monitor in a fully professional, highly flexible, easy to use, portable system for today’s working musicians...

www.jbl.com

That looks much more like a grown up toy. Has a 10" woofer too.

The way it's mounted reminds me of my Infinity Overtures.