Required crisper voice in Flash

I have included a voice file in my flash presentation. But the voice is not crisper. The included file is not as crispier as the original sound track. the original sound track is in .wav format. Why this distortion happens? Is there a way to make it sound like the original track?

regards

in the library, right-click on the sound file, and select properties.

in the pop-up window, you will see a choice for compression. set this to how you want it, and use the test button to check it.

remember, higher quality = higher filesize.