I am currently looking at buying the Sennheiser X320 gaming headset for my xbox 360. However, I am using a pc monitor which doesn't have any RCA ports. What components will I need to buy in order to use this headset with my pc monitor? P.S I already have a 2.5mm to 3.5mm jack to cover one problem with this headset, I just don't know what I need to get the RCA ports to work with my monitor.