For almost all subwoofers, you do not need 1 to 2; just go from the output on the receiver to the (usually) left channel on the sub. Check the manual for your subwoofer.
The distance between your receiver and your subwoofer is typically long enough to warrant a shielded cable.
Do not buy from Amazon, because you do not know what kind of crap you are going to get. Buy from a vendor that knows what they are selling. E.g.: https://www.bhphotovideo.com/c/product/1320249-REG/svs_soundpath_rca_audio_interconnect_cbl_2m_soundpath_rca_audio_interconnect.html
