Unfortunately I'm wrong - I confused the P2 with the P1.
The P2 has one XLR, so in mono, connect it with a standard female to male XLR to a mixer output and you will have a balanced mono mix.
For stereo you will need an adaptor to convert two mixer balanced output XLRs into unbalanced feeds that you can then connect (via a two core plus earth mic type cable) to the pins of the XLR feediing the P2 .
I don't know if that is available off the shelf, but a simpler option might be to use a TRS jack to XLR male cable and plug it into the mixer headphone socket.
David
PS sorry for the misdirection.