Decaf is a guy who cleans up songs (removes clipping), re-balances levels, creates an even dB level from song to song and throughout frequencies within a song, lowering shrill highs, taming over accentuated mids... it is so much more than hitting bass boost and selecting slow 10%. The music is clean, un-clipped and much safer than the standard music you can find on the internet, therefor it is a must have for anyone with a ported enclosure for their sub. The songs are also labeled with frequency's such as "32" or "41" which indicates the frequency that the song peaks at, which is helpful on several levels, which is why they are a must have for any mobile music library. Unlike decaf, producers do not follow guidelines, they don't all go to the same school, or even attend one for that matter. The enormous variation in mixes is what frustrates him and fuels him to continue, finding interesting obscure songs that aren't all radio pop, showing the vast range your system can have. ram-designs.com/decaf/ <---- download the files here. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.