Just to answer the original quesiton on the adapter...I was recently looking for the very thing you were. I couldn't find any pre-built, so I ended up buying jacks at an electronics store (Radio Shack has them) to make my own adapters.
(I wound up not needing them and my project wasn't the same as what you're trying to do)
I can't speak about the airport express, but the nuForce looks like it should do the trick if the APX works as I would think it does. Depending on your needs and budget, something new and super digital down to a used receiver from goodwill could work.
So I bought a used amp connected that to the speakers now have a 3.5mm cable directly connected to the laptop. Would it be possible to instead connect the 3.5mm cable to the APX so that I can stream my music from itunes to the receiver?
If you have a airport express it's output jack is the same as on the back of your Mac. It is "line level".
You need an amplifier to drive a passive speaker. Almost any amplifier will do and a very simple one is best. I use an Audio Source AMP-100 to drive a pair of Polk Audio speakers connected to my Yamaha keyboard. The amp is more than powerful enough and sounds good and is not expensive. Also this amp is a good building block for a larger system and you can always use it later for just about anything.
THe amp takes RCA inputs so you need 3.5mm stereo to RCA cable. These are easy to find and not expensive. Sweetwater is a good place to buy the cable because they sell these with no shipping cost. But I bet Amazon has them as well. OK I just checked type "3.5mm rca split" into Amazon's search box and you get about 50 to choose from.
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