First off, I like to appeal to all concert and show organizers in the country. I know it is your goal to earn from your events or facilities (i.e. bars) but I'd like to address that the sound system is just as important as the artists and hosts you pay when producing a show.
Just to make it clear, I believe in free trade. No one is stopping anybody from putting up a sound system utilizing Raon speakers, Behringer mixing consoles, counterfeit Shure mics, and a crapload of Marshall MG amps and Planet Z cymbals and drums with 5-year old drumheads. But once these cheap sound system providers quote you rock bottom, don't let the low prices appeal to you. Doesn't mean that if your show artists' tech riders do not require high end or even mid-high equipment, with 3 monitors for each onstage, doesn't mean you shouldn't raise the bar yourself as a listener to live music. Show organizers must make the audience and the players happy, and a half-assed sound system is gonna cause the big disconnect amongst everyone. Please be aware of industry standards as well as proper stage layouts, and the required loudness for the venue. Cutting corners on the sound system is not the smart thing to do if an event is music-based.