Can My DVD Player / TV / Stereo does not have an 3.5mm AUDIO OUT. It only supports the old RCA (white&red) jacks for AUDIO OUT. What can I do?

Easy!  If your audio source device does not have a 3.5mm jack for AUDIO OUT, then you will need to purchase an RCA to 3.5mm adapter cable (sold separately from several sellers in eBay for just a few dollars!) in order to  to make it work.