http://www.creative.com/press/releases/ ... ?pid=12620
Creative (NASDAQ: CREAF), a worldwide leader in digital entertainment products, today announced that it has invented the Creative Xmod, a device based upon its X-Fi® Xtreme Fidelity™ audio platform that improves music playback quality for MP3, WMA, iTunes or AAC songs to beyond the original CD quality. The Creative Xmod is a small device just about the size of a candy bar. It connects between stereo speakers or headphones and either a PC, Mac, iPod, ZEN™ or any MP3 player, and it dramatically improves the listening experience by upconverting the music during playback to the X-Fi Xtreme Fidelity standard - very high-quality 24-bit surround audio.
The Creative Xmod enhances the low and high frequencies while improving audio dynamics for cleaner, richer sound that surpasses the original audio CD. Without requiring to install any software, it takes just seconds to connect to a PC or Mac, allowing users to instantly improve the playback quality of their music to the X-Fi Xtreme Fidelity experience. For connecting iPod, ZEN or any MP3 players to the Creative Xmod, an optional AC power adaptor is required.
More info here:
http://www.creative.com/products/produc ... duct=15913
Personally, the Xmod sounds like a DSP with an automatic equalizer that boosts the highs and lows.