Interestingly, the S/PDIF outputs are also capable of carrying multi-channel surround formats such as Dolby or DTS, which means the Audiophile USB also has applications in computer-based home theatre. Bit depths of up to 24-bit are supported with sample rates from 8kHz to 96kHz, though there are some I/O limitations when working at high sample rates or high bit depths. Packaged as a small, silver desktop unit, the M-Audio Audiophile USB works via a standard USB connection and draws its power from an included 9V AC adaptor to provide two channels of analogue I/O, stereo S/PDIF digital I/O and set of MIDI In and Out ports. In situations where the I/O requirements are more modest, however, USB works perfectly well. For multiple simultaneous inputs and outputs, Firewire is the clear winner because of its greater bandwidth, although USB 2 will level the playing field somewhat when it becomes more widely supported. With the increase in popularity of 'slotless' computers, such as laptops and iMacs, several manufacturers of traditional soundcards and audio interfaces are extending their ranges to include external units connected by USB or Firewire. Now those without PCI slots can access similar features thanks to the new USB version. M-Audio's Audiophile PCI card is already a popular choice for musicians needing high-quality audio I/O.
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