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== candidates ==USB sound "cards" are actually external boxes that plug into the computer via USB. They are more accurately called audio interfaces rather than sound cards. The USB specification defines a standard interface, the USB audio device class, allowing a single driver to work with the various USB sound devices on the market. == Low End Consumer Grade ==Commonly used as a substitute for the built in sound card on laptop computer, however, may provide a sound interface for any PC with a USB port. The inexpensive lower end versions are designed primarily for producing sound. Sometimes consumers seek out a surround sound USB adapter when their laptop has only stereo out capabilities. [[Image:wiki_USB-7-1-Sound-Card.jpg]] === Creative Labs Xmod USB Sound Card ===[[Image:wiki_soundblasterusb.jpg]] It connects in seconds to your notebook, PC or Mac to create an Xtreme Fidelity sound system. A true plug-and-play device, there’s no software installation necessary, and you can begin enjoying the richness of X-Fi right off the bat. Even if you have a computer with a good speaker system already, the Xmod improves the sound coming out of those speakers by widening frequency response and brings back the detail lost by compression and mastering the original performance. == Professional / Studio Grade ==For studio grade recording, digitizing music, phono to CD, microphone recording, mixing, as well as producing extremely high quality, low noise audio - these adapters are a different animal than the low end USB sound cards described above.[[Image:wiki_E-MU0404USB2.jpg]][[Image:wiki_pb_7_AUDMAU2425.jpg]]=== RatocSystem RAL-2496UT1 ===[[Image:wiki_RAL-2496UT1.jpg]]Features a Digital Sampling rate of 16/24bit and 44.1/48/88.2/96kHz. When this hits the U.S. market is may be one of the top cards available.* http://en.akihabaranews.com/26123/audio-systems/ratocsystem-new-external-usb-sound-card-with-headphone-amp* USB Audio Interface