While the market is packed with add-in cards offering gaming and "multimedia" experiences, there have been very few that aspire to offer "audiophile" quality. There are very good reasons for this: the amount of rogue radio frequency present in a typical PC makes it quite difficult to turn out a hi-fi product. In an industry dedicated to making things faster and more powerful, not many companies are focused on making the computing experience "better".
But sound cards are sound cards, right? You wouldn't expect much difference between one and the other. It just works. Well, Creative would like to disagree with that.
Creative's E-mu division has a lot of experience in the pro audio field, and a lot of the technology produced there trickles down into Creative's high-end consumer audio cards, including this: the X-Fi Titanium HD.
While Auzentech and Asus have had "audiophile" cards on the market for some time, it's taken Creative quite a while to catch up. Like cards from those two manufacturers, the Titanium HD also caters to tweakers, with features like swappable op-amps enabling users to experiment with different sounds, but this isn't the most interesting thing about the card.