Can I run an ethernet cable directly from an IMAC 10.5.8 port to Yamaha 671 ethernet port without using a router? I have Airport Express in another room and its only ethernet port is used for a Verizon DSL modem connection. The MAC gets a WIFI from Airport Express signal to function. My objective is to get Itunes from the MAC to network to the Yamaha via an ethernet cable. If it is not possible to do a direct connection, can I use a TP Link TL-WR700N router (or another inexpensive router) instead of second Airport Express which is more expensive.