[Checkitman22]

I'm getting DT990s and a magni (already have a soundcard) and would like to know about hooking up multiple sources to the magni as well as splitting the sound from my headphones as well as my speakers and sound quality.
 
First is there an easy solution to hooking up my audio out from my TV as well as the audio out from my PC to my magni at the same time (not both on at the same time, obviously) with easy of being able to switch between the two without much hassle? And yes I consider unplugging one and pluggin in the other a hassle. I know there are auxiliary input selectors but I really don't want to spend 120 dollars on this it isn't that important to me.
 
Second would this splitter cause any difference in SQ if I got it? I need to split the sound to my speakers and magni.
 
http://www.amazon.com/Belkin-Speaker-and-Headphone-Splitter/dp/B000067RC4/ref=sr_1_1?s=electronics&ie=UTF8&qid=1374505927&sr=1-1&keywords=3.5+splitter
 
Finally would this be ok to send from the splitter to the magni?
 
http://www.amazon.com/gp/product/B002K8A75I/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=A1H9NMCPZH97BO