Airport Express "wired client mode"
I own an AirPort Express 802.11n (1st Generation), so the old wall-plug but with 802.11 Draft N. The only thing I want to use it for, is for Airplay. Currently it is connected to my router in "client mode" over wireless, and my receiver is connected to it through the jack-interface. The Airport Express is only 1 meter away from the router.
Unfortunately the sound is very often stuttering, and sometimes it is hard to connect to Airplay at all. I will have to reboot my Macbook / router / Airport Express and then it will often work again for a while. In the meanwhile I have replaced my Macbook twice and also have a another router, so I don't think the problem is in one of those components.
Since I don't have problems with my wireless connection on my Macbook, I suspect that somehow the wireless connection between the router and the Airport Express is not stable.
I've done some research and I believe it is not possible, but I still have to ask: is it possible to have the Airport Express join my existing network using a wire (since it is very close to my router) and then still use it for Airplay? Or does the newest model maybe support this?
MacBook Pro with Retina display, OS X Yosemite (10.10.1)