Headphone to RCA

I'm looking to interface the headphone jack on my laptop with an RCA jack on my TV. I already have a cable that goes from 1/8th inch stereo to stereo RCA. The problem is, the volume is terribly low and loud noises (such as explosions during a movie) cause the output to saturate and the volume drops even more. So I figured I could build a simple op-amp circuit. I've been looking everywhere for the electrical characteristics of the headphone jack and the RCA jack but I can't find anything! Apple's website lists the characteristics of their headphone jack as having a peak output of 4.5Vp-p with a 10 ohm source impedance. Of course, I have a Compaq laptop, but I figured mine is probably about the same, at least with respect to the peak output voltage (which is all that really matters with an op-amp since 10 ohms is nothing). Also mentioned that headphones have an impedance of 32 ohms so I thought I might make the input impendance of my little amp 32 ohms. But I can't find anything about the RCA jack. In particular, it'd be nice to know what the max voltage is that it expects. I wouldn't want my amp to drive it too high. Any information or other insight would be great!