splitting input at receiver end

Hi all,I hope you can wrap your heads around this.

I game and skype regularly from my PC but using my 2.1,people who I'm skyping with get a lot of feedback from my end so I usually just switch to my headset but that means constantly unplugging etc.

From my PC, the audio output is a 3.5mm jack,this is split into 2 x RCA connectors before going into my amplifier.

What I've done is used one of these:
https://encrypted-tbn2.gstatic.com/...erNTgpajLUxXIAdgIaodTHVmmevGrjy4bypWmbPxWGPkn with a female 3.5mm jack inbetween the cable from the pc and the amp to split the signal to a 3.5mm jack so I can plug my headset into that.

It means that the audio plays through both the speakers and headset at the same time and I just mute whichever I don't use at the time.

Is this OK/safe to use?

That will work fine but if you have a receiver that supports digital input (S/PDIF or HDMI), use that instead. Also note that while the headphone jack on a digital receiver (if it has one) is more or less just an afterthought, it may still do better than onboard. Try it.