The ELX200-18SP 18" Powered Sub seems like a great option for small and medium indoor events. Just one sub should be enough unless your playing for over 200 people. I think it's ideal for mobile DJs and bands. I am sure that there are louder 18" subs in the market, but not at this weight (64 lbs) and compact size. I've never considered a 18" sub before due to their weight, size and because they seem too boomy for my taste. When I heard this sub for the first time, I immediately knew that this was the "one". It's punchy and goes low enough for me without being too boomy. They work great with pop music, oldies, latin music (salsa, merengue, reggaeton, cumbia). However, since it doesn't go below 40 Hz, I don't think it's a good option for hip hop or EDM.