What speakers would be loud enough?

I'm constantly having parties in my backyard however no docks that I connect my iPhone too are ever loud enough. What is recommended? And I want it like heaps loud. I've seen some amps that you can connect an iPhone too but even then I don't know how loud they are and what watts are recommended! Please help!

Also are car amps used in your backyard? What is the difference?

I think a home theater set will work

The bigger ones.

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