Pro-Ject Head Box S2

How do I need to connect this headphones amp if I’m using a pro-ject tube S2 preamp for a turn table?

If I have a turntable without a pre ampifier, can I use this or do I need a seperate pre amp as well? And if this can do the job of a pre amplifier, can I use it as just that? Like, can I connect my turntable to this and then to my amlifier and speakers?

Does it support 250 ohms