It's now easier than ever to connect your portable music player — be it an iPod, satellite radio, or MP3 player — to your car stereo. And often, there's more than one way to connect it.

So now that you're faced with options, how do you determine the best way to connect? Some ways are easier than others and some ways will yield better sound than others. Here we'll take a look at the different ways to connect your music player to your car stereo and see which ones will yield the best sound.

In this article, we're not concerned with the source of the music itself. Obviously, music with less compression, like a track on a normal CD, will sound better than music that's heavily compressed, like the same song recorded as a small MP3 file. Likewise, some music devices do a better job of reproducing the music than others. That's irrelevant for us right now. Regardless of how compressed the music is or where it's coming from, you want it to sound its best over your car stereo. That's what we're going to examine here.

In the old days, it was easy: CD sounds better than cassette. And that's all there was to it. Today, we can choose not only from a wide variety of sources (iPod, satellite radio, MP3 players, and more), but also from an array of ways for piping the music from your source, whatever it may be, into your car stereo. The four most common methods are:

• wireless FM transmitter and hard-wired FM modulator
• auxiliary input
• Bluetooth® transmitter
• cassette adapter

There are a few associated questions to consider, as well. For example, is it worth the extra trouble to hardwire an FM modulator, when you also have the convenience of a wireless FM transmitter?

Read on, and we'll examine the details of each option.