One truth about working with A/V is you always need the cable or adapter you don't have in your toolbox. That's why we love these terminal-block RCA connectors so much. No soldering required! Use stranded or solid core wire and a small screw driver to create custom wiring jigs.
This is the RCA (Composite Video, Audio) Male Terminal Block. RCA is one of the most common A/V connectors.
We also have a (matching) RCA Female Jack Terminal Block!