So I've just bought my first turntable, a project primary e and the guy at the store told me it has an inbuilt pre amp so I just need to connect it to speakers with their own power source (I've connected it to my edifier R1700BTs). But the sound is super low so now I'm a bit confused. Do I need to buy an external pre amp? Some sites say there's a phono/line switch but I can't see it anywhere. Help!