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In addition to PCI and PCIe internal sound cards, Creative also released an external USB-based solution (named X-Mod) in November 2006. X-Mod is listed in the same category as the rest of the X-Fi lineup, but is only a stereo device, marketed to improve music playing from laptop computers, and with lower specifications than the internal offerings.
The USB specification defines a standard interface, the USB audio device class, allowing a single driver to work with the various USB sound devices and interfaces on the market. Mac OS X, Windows, and Linux support this standard. However, some USB sound cards do not conform to the standard and require proprietary drivers from the manufacturer.
It is also possible to connect the player to a PC with Windows, Mac, Linux OSes and devices in order to function as a USB DAC. With its built-in Wolfson WM8740, the FiiO X3 can drive headphones with any impedance ranging from 16 to 300 ohms. The player also offers gapless playback, and hardware (non-DSP) bass and treble controls. [2]
The sound card with the external DAC consumes 75 W, and thus is the first sound card from Creative that requires auxiliary power, using a 6-pin PCI-E connector to supply power to the external DAC. The card was officially released on July 10, 2019, to celebrate 30 years since the introduction of the original Sound Blaster.
It used external power (9 volt battery) and could be turned on/off by software. Contrary to the Covox Speech Thing which had no FIFO buffer , the Disney Sound Source features a 16-byte FIFO allowing for autodetection and flow control, which clocks digital output to the resistive DAC at a fixed sample rate of 7 kHz ±5%.
Support for playing music from external streaming platforms such as Pandora, Napster, Last.fm and Sirius were also added. The devices in general have two operating modes; either standalone where the device connects to an internet streaming service directly, or to a local computer running the Logitech Media Server or a network-attached storage ...