Making A Clear Bass Bost

How can i make a clear bass bost like this http://www.youtube.com/watch?v=mg53mC7xdQA.
The bass bost effect isn’t the best way to do that. So can you explain me how?. i want listen the lyrics, not a RAWRAWRAW… I couldn’t find a tutorial who results clear. Thanks

To make a clear bass sound, keep the level below 0 dB so that it does not distort.
In that example, note that the bass is very loud but does not extend beyond the top/bottom of the track. In comparison the vocal has a very low level.
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