Questions about Pro-Ject Phono Box

On the preamp side, it's RCA input and output. This is also often the case with turntables. On the hi-fi side, it's very variable. Often RCA, sometimes jack or mini jack. I don't remember if cables were supplied in the packaging.

The Phono Box () from Pro-Ject is a phono preamplifier suitable for moving coil (MC) and moving magnet (MM) cartridges. The Pro-Ject Head Box S2 is a headphone amplifier that is usually connected to a line level output. The Phono Box provides a line level output that is compatible with a line input of the Head Box S2. This means that the Phono Box can be easily operated with the Pro-Ject Head Box S2 by connecting the output of the Phono Box to the input of the Head Box S2. This allows you to pre-amplify vinyl records via the Phono Box and then listen to the sound on your headphones via the Head Box S2. In short: Yes, the Phono Box can be used with the Pro-Ject Head Box S2, as the Phono Box as a phono preamplifier provides the appropriate line output for the Head Box S2.

In principle, you should be able to use any input, as they are technically the same. With the tape input, there are only 2 additional outputs so that you can also record. But I'm no expert...

Yes, it works perfectly. However, you need a 3.5 mm stereo jack to chinch connection cable to connect the preamplifier to the Play 5. Here are some instructions from SONOS: https://blog.sonos.com/de/schallplatten-ueber-sonos-hoeren/