will splitting 1 jack audio into output and input reduce quality?

[cameron1764]

i have these headphones:https://www.plantronics.com/gb/en/product/rig-400-pro-hc
It has 1 output, so I can only use them as headphones (output) or microphone (input) at a time.
I want to use them on pc and use them both simultaneously.

I found out that I can use one of these splitters: https://www.ebay.com.au/itm/3-5mm-AUX-Female-to-2-RCA-Male-Splitter-Cable-Stereo-Audio-Adapter-Cord-Lead-/311446098848?oid=111201679129.

Will using that splitter reduce the audio quality? I am trying to get the best out of dolbey atmos

 

[Alabalcho]

It shouldn't, but it will cost you $1.49 to try.