It's actually quite astonishing when you consider all the product lines that Asus offers: laptops, netbooks, slim media PCs, desktops, servers, monitors, graphics cards, sound cards, routers, computer cases... the list literally goes on. What gives me a slight expression of disbelief is the range of target markets, from hard core overclockers, to young school children, average 'noobs' and families, business elite, and science 'boffins' pushing the boundaries of research. The proliferation of Asus' products throughout households and businesses around the world proves this is no "jack of all trades, master of none" company. It's among the top five computer manufacturers in the world.The same world that has gone Hi-Def crazy, with consumers tripping over each other for the latest TV technology; I still find it strange that most people either have a very poor or mediocre sound system or simply use the TV's built-in speakers. People can hear the difference between a cheap sound setup and high-end system, but it's as though people have forgotten about sound quality.Well, I'll tell you who hasn't forgotten: Asus, with its solid line of high-end sound cards which perform spectacularly for listening to music and as part of a computer-based home cinema. The Xonar Xense One builds on the success of the Xonar Essence STX, featuring the same headphone amplifier, but this time a modified Sennheiser PC 350 headset is included as part of the package. As I have previously reviewed the Xonar Essence STX, I have high hopes and expectations for the Xonar Xense One, but wonder what changes Asus have made to tailor this sound card for gaming. I am also intrigued to find out how Sennheiser PC 350 performs alongside it, and how it compares to other headphones and headsets.