thumb|right|FiiO K9 headphone DAC + amplifier FiiO (FiiO Electronics Technology Company, Ltd.) is a Chinese consumer-electronics manufacturer headquartered in Guangzhou, founded in 2007. The company designs and markets portable and desktop audio equipment, including digital audio players (DAPs), headphone amplifiers and DACs, Bluetooth DAC/amps, and in-ear monitors (IEMs).
thumb|right|FiiO K9 headphone DAC + amplifier FiiO (FiiO Electronics Technology Company, Ltd.) is a Chinese consumer-electronics manufacturer headquartered in Guangzhou, founded in 2007. The company designs and markets portable and desktop audio equipment, including digital audio players (DAPs), headphone amplifiers and DACs, Bluetooth DAC/amps, and in-ear monitors (IEMs).
FiiO first gained notice for low-cost portable amplifiers and USB DAC/amps in its "E-series", notably the E17 "Alpen" (2011–12). From 2013 it expanded into DAPs with the X-series (X3, X5, and the modular Android-based X7), helping to popularise affordable hi-resolution players; later Android M-series players such as the M11 broadened codec support and introduced dual balanced outputs.
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