Out door environments don't have room gain to help speakers reproduce bass. So you need to place your speakers against a sturdy wall if available to get some bass. Secondly Your speakers will need to be very efficient because it takes a lot more energy for speakers to be effective out doors because there is no enclosed room to re- enforce the sound. You want Something close to or exceeding 100 db per watt. jBL. EV, and very efficent ALtec LAnsing, even KLipsch come to mind. Plus the speakers need to be water proof. I guess larger JBL or EV with at least 12 or 15 inch woofer. I don't know if KLipsch makes professional outdoor Herseys any more. Proessional LA Scalas would be just to expensive. EV use make a 15" pool side coax speaker that worked well against a wall out doors and was close to 100 db efficient. Of course the sound can never be over 55 db, Slow, A weighted at the property line in some cities after 10 PM at night. WE have these rules but know one seems to enforce them when there is a neighborhood party going on. The party just gets larger as curious folks stop by to see who got married or became 15, or who has been married 20, 30, 40, or 50 years or maybe just engaged. .