digital analog converter

hey guys! So my 12 year old is super into vintage electronics. His dad recently passed away and he had an old box tv in his room at his dads House that he would play his wii and Nintendo on. When his dad died, his beloved box tv got thrown out. So i searched everywhere and finally found him an...

So i got a pretty dated car and it has 2 RCA ports, R and L audio. And i need to connect an AUX 3.5mm jack to the car, so i found this Single RCA Male to Double AUX Female adapter. Will it work plugged into just one port (ex. R port) And will the sound come out normal?

I bought this converter https://www.amazon.de/gp/product/B01MXSK8YX/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1 and another two actually. I Tried to connect Them with my jbl es 20 speakers which are connected to the amplifier. The tv is a Samsung ue65ks8080. And changed the settings audio...

I have an HDTV with optical out. Trying to connect to a mini amp that only has RCA inputs. Question is, if I connect the TV to an analog to digital converter, then connect the converter to the amp, can I control the TV volume from the TV remote? TV is an LG 55LM4700. amp is a lepai LP-2020A+...