What's the best study spot in Memphis?

I'm looking for a good place to study in Memphis, home is too crazy. The public library hours are too short, Starbucks is too loud, Republic Coffee is nice but I don't feel good about staying there for 6-7 hours ordering only one cup of coffee. I need a place that has wifi and is somewhat calm. The buzz of background conversation is OK, but super loud coffee machines are not. Does anyone have a suggestion?