If you want the cheapest studio monitors possible, you should check out the PreSonus Eris 3.5s, which unbelievably are available for less than £/$100 for a pair. I've put together a comprehensive FAQ ...

might also have a pair of XLR outputs – like the Presonus Studio Live AR8C. As we'll see, it doesn't really matter which type of output your interface has, as long as your studio monitors has ...