Hi and welcome to Beoworld! The answer is 'yes' - the RCA line-in has auto-sense which will trigger the PL and Beolabs.  You may well have to set up autosense (sensitivity etc) in the menu, accessible from most browsers or the B&O app.  You will also have to set up whether the output should be fixed volume or controllable (via remote or B&O app).

Quick response! Thank you motoGuy. Im no new member but a very quiet one. ;] Are there more optional devices with that feature, besides the Beosound Essence MK1 and MK2 you know of?

Ah, I should have checked - you registered nearly 4 years ago, and may well have been on the old forum too! Here's another device that will carry out the same function:  https://shop.oneremote.dk/shop/69116-powerlink-aux-adaptor/ Or you could look for a second-hand B&O Playmaker - they have auto-sense on the aux input:  https://bangolufsenassistentgohe.blob.core.windows.net/manuals/SOUND_SYSTEMS/PLAYMAKER/UG_Playmaker_EU_US_current.pdf

My first registration is older then that, but not of any importance.^^ Thanks again, very helpful!

Hi, I'd like to add that Autosense in my Playmaker is a little bit wobbly in my case: Airplay start do work. Line in do work. But cross switch do not work at all. If I've use line in then Airplay Auto sense doesnt work anymore. Nor if I stop Analogue in nor if it is just hjiacked with an airplay signal. I need the to select the entries with the remote. Maybe a local issue but needs to be said if your use the Playmaker in heterogenous setup. Cheers.