Happy to share that my Marantz 1504 (got from avshop) was able to connect to the internet and enjoying Internet radio and AirPlay using iTunes via AirPort Express's ethernet cable. Not on the main router. So I am very surprised and happy at the same time and don't need to run a lan cable from 20 meters away.
On the other hand, nagsisi ako di ako kumuha ng SR5008. sana dinagdagan ko na lang when I got my 1504 weeks ago since 5008 has HDAM.