Specifically I need to connect a Wii (composite RCA plug output - 2 stereo sound, 1 video) console stereo output to my Logitech (3.5 mm male) computer speakers. This is a fairly common problem, Amazon has two different solutions:
2 x RCA Female / 1 x 3.5mm Stereo Female Adapter (CableWholesale)or
I ordered the second one because I needed a bit more versatility.
Now I'd also like to use my computer with the same speakers. I'm going to try using a headphone splitter in reverse -- so the sound sources will plug into the headphone jacks and the speaker will plug into the input jack. I think it might work ...
PS. The mess of a adapters and cables cost half as much as the Logitech computer stereo system. The profit margin on cables is impressive.