Final Cut Pro Audio to Flash Encoder

Ok, I have been working on perfecting the web site video spokesperson like you see on pagegravy.com.

I have perfected everything with the green screen, keying, apha channel, etc. The last obstacle for me has become the sound. Check out pagegravy.com.

Wow, their sound is awesome. How did they get it that good? Are they using an audio filter to acheive that effect? I use very high end seinheisser wireless lavaliers and they sound alright in final cut ( I would like to know some good filters to use to sweeten it up) but by the time it makes it out of the flash encoder it's not that great. I need my audio to sound amazing like on pagegravy.com. Have you guys tried anything as far as audio goes? I need something to make my guy's voice jump on the web site.

Any suggestions? Help would be greatly appreciate. Thanks to everyone.