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The FiiO K13 is a desktop DAC, headphone amplifier, and preamplifier built around dual ESS ES9039Q2M DACs and a fully-balanced audio architecture. It supports PCM up to 32-bit/768kHz and DSD512 over USB, delivers up to 2400mW + 2400mW into 32Ω from its balanced headphone output, and adds Bluetooth 5.4 with LDAC, 10-band PEQ with Auto EQ, flexible digital connectivity, and AC or external DC power.
Two ESS ES9039Q2M DACs handle digital conversion, using ESS fourth-generation 32-bit HyperStream architecture. The DAC stage is rated for 130dB DNR and -120dB THD+N at the chip level, providing a capable foundation for high-resolution playback.
The K13 uses fully differential signal processing across the DAC, I/V conversion, low-pass filter, preamp buffer, and headphone amplification stages. OPA1656 op-amps handle I/V conversion, OPA1642 op-amps are used in the LPF and headphone amplifier stages, and TPA6120A amplifiers provide dedicated left- and right-channel headphone amplification. Gain control, pop-noise suppression, and headphone protection circuitry are integrated into the design.
The 4.4mm fully-balanced headphone output delivers up to 2400mW + 2400mW into 32Ω in high gain. Into 300Ω, it provides up to 600mW + 600mW. A 6.35mm single-ended output delivers up to 1220mW + 1220mW into 32Ω or 150mW + 150mW into 300Ω, giving the K13 output options for a broad range of IEMs and full-size headphones.
Low, medium, and high gain settings provide three independent volume curves for matching the K13 to different headphone sensitivities and power requirements. Headphone output and preamp volume levels can also be memorized independently, reducing adjustment when moving between headphones and a connected speaker system or power amplifier.
An XMOS XU316 USB interface supports PCM playback up to 32-bit/768kHz and DSD512. Coaxial input supports up to 24-bit/192kHz and DSD64, while optical input supports up to 24-bit/192kHz. The K13 can also provide coaxial digital output up to 24-bit/96kHz when operating in USB mode.
Bluetooth 5.4 reception supports LDAC, AAC, and SBC codecs for wireless playback from compatible phones, tablets, and computers. LDAC support provides a higher-bandwidth option for compatible Bluetooth sources while retaining the convenience of wireless input.
The XMOS XU316 platform supports a specially developed 10-band parametric equalizer across the K13's operating modes. FiiO's Auto EQ function can apply a target headphone curve, with further manual adjustment available through the FiiO Control app. A web interface is also available for PEQ adjustment when using USB input with EQ enabled. PEQ processing supports audio signals up to 24-bit/192kHz.
USB, optical, coaxial, and Bluetooth inputs allow the K13 to serve as the digital hub of a desktop audio system. Headphone, balanced XLR, RCA line, preamp, and coaxial digital output options extend its role beyond headphone listening, including connection to power amplifiers and active speakers. Output modes include PO, PRE, PO+PRE, and LO.
A built-in 30W AC power module supplies the K13 directly from mains power. An external 12V/2.5A DC input provides an alternative for use with a compatible external power supply. Internally, a multi-rail power architecture uses up to 18 low-noise LDO regulators and five DC-DC converters, with dedicated regulation for analog and digital circuitry.
The analog and power sections incorporate four ELNA RA3 series silk-film audio capacitors, eight WIMA film capacitors, and 24 low-temperature-drift MELF resistors. Two ACCUSILICON AS318-L femtosecond crystal oscillators operating at 45.1584MHz and 49.1520MHz provide clocking for the digital audio section.
The front-panel LCD displays information including sampling rate, volume, gain, input, and output mode. Adjustable RGB lighting can indicate the current sampling rate, with brightness, color, and pulsing behavior configurable through the FiiO Control app.
Kaksi etupaneelin nuppia tarjoaa suoran pääsyn äänenvoimakkuuteen ja valikkotoimintoihin. Mukana tuleva infrapunakaukosäädin tuo lisää hallintaa työpöydän tai kuunteluhuoneen toiselta puolelta, ja FiiO Control -sovellus tarjoaa pääsyn yhteensopiviin asetuksiin Bluetoothin kautta. Lisäksi käytettävissä on säädettävä 1–99 minuutin sammutusajastin.
K13:ssa on paksunnettu yksiosainen alumiiniseoskotelo, jonka yläpaneelissa on pyöreä valoaukko, joka paljastaa näkymän sisäiseen DAC-osioon. Mitat ovat noin 8.27 × 7.40 × 1.65 tuumaa (210 × 188 × 42mm) jalat mukaan lukien, ja paino on noin 2.12 lb (960g). Saatavilla on musta ja hopea viimeistely.
Ylikuumenemis- ja ylikuormitussuojaus aktivoituvat automaattisesti, kun epänormaalit käyttöolosuhteet havaitaan. Vahvistinpiiri sisältää myös kuulokkeiden suojauksen ja pop-äänien vaimennuksen.
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