How do I convert an analog audio signal for use with digital speakers?

Question

I just bought an old turntable, and it's output is a standard two cable audio analog output. (That is, one red cable and one white, just like a playstation. I think it's called RCA.) I don't want to use a full amp and analog speakers, since my apartment is small and space is limited. I have a brand new pair of computer speakers I want to use, but it connects to a computer with a single, lime green input cable. (So both the turntable output and speaker input cables are male pieces, neither is a female.) I want to know if there is an adapter I can use to convert the signal, where to get it, and how much it costs.

Also, I have a pre-amp that accepts the male piece outputs from the turntable, provides power (it plugs in at least) and has two FEMALE piece outputs (still one red, one white) on the other side. My speakers have their own power supply, but I do have this piece if it is helpful. Any thoughts are appreciated.

Answer 1

You DO need that pre-amp.  It should be a "Phono Pre-Amp" that not only changes the signal level, but also changes the ohmage so it will work with a regular stereo, or set of speakers.  

On the output of the pre-amp you need to get an adapter that will accept the to phono inputs and convert them to a female 1/8th inch jack.  They may not sell this exact piece at Radio Shack.  You may need to buy a few pieces to put it together yourself.

Answer 2

You need a stereo-RCA to 3.5 mm adaptor (also called PC audio), available at Radio Shack and other stores.