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Asus Xonar Essence STU External Sound Card View larger

Asus Xonar Essence STU External Sound Card



Asus Xonar Essence STU External Sound Card

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Asus Xonar Essence STU External Sound Card

Product Specifications

Asus Xonar Essence STU - USB DAC ( Digital-to-Analog Converter ) + headphone amplifier ; 120dB SNR , asynchronous USB audio . built-in 600ohms headphone amp , outputs : 6.3mm headphone out + RCA ; inputs : AUX + SPDiF ( coaxial + optical ) + USB , 2x dedicated volume control knobs for speaker + headphone , with vertical stand

Product Range Features (Actual Product Features May Differ)

Following considerable positive feedback from customers on the excellent sound quality of Xonar Essence ST/STX sound cards, we developed the Xonar Essence STU USB external digital-to-analog converter and headphone amplifier. Based on the acclaimed design of Xonar Essence ST/STX and going beyond their already high standards, it offers even more premium audio quality plus easy controls and connectivity for discerning music lovers who needs a good DAC and headphone amplifier to drive the full capabilities of their high-end headphones.


  • Excellent audio quality as inherited from acclaimed Xonar Essence ST/STX
  • Precision clock tuning technology and asynchronous USB transfer ensure jitter-free fidelity
  • Integrated 600ohm headphone amplifier optimizes sound detail with two gain settings
  • 120dB Signal-to-noise ratio (SNR) delivers high definition audio clarity
  • Dedicated jumper switch allows direct audio delivery to your power amplifier, by-passing DAC volume controls
  • Three swappable Op-Amps enable tonal character tuning based on personal taste

Product Range Specifications (Actual Product Specifications May Differ)

  • Audio Performance
    Output Signal-to-Noise Ratio (A-Weighted) (Front-out) :
    120 dB
    Output THD+N at 1kHz (Front-out) :
    >0.00036 %(-108 dB)
    Frequency Response (-3dB, 24bit/192KHz input) :
    10 Hz to 48 KHz
    Output/Input Full-Scale Voltage :
    Unbalanced Output : 2 Vrms ( Vp-p)
    Headphone : 7 Vrms ( Vp-p)
  • Bus Compatibility
    USB 2.0 high-speed
  • Chipset
    Audio Processor :C-Media CM6631A High-Definition Sound Processor
  • Sample Rate and Resolution
    Analog Playback Sample Rate and Resolution :
    44.1K/48K/88.2K/96K/176.4K/192KHz @ 16bit/24bit
    ASIO Driver Support :
    44.1K/48K/88.2K/96K/176.4K/192KHz @ 16bit/24bit
  • Connectivity
    Analog Output
    1 x 6.3 mm jack (1/4") Headphone out
    2 x RCA (Un-Balanced)
    2 x S/PDIF in (1 x Optical (Toslink)/1 x Coaxial)
    1 x Aux in 3.5mm jack (1/8”)
  • Operating System
    Windows® 8 , 32bit/64bit
    Windows® 7 , 32bit/64bit
    Windows® XP , 32bit/64bit
    Mac OS X *
  • Accessories
    6.3mm to 3.5mm stereo adapter x 1
    Driver CD x 1
    Quick Start Guide x 1
    USB cable x 1
    Power cord x 1
    Power adapter x 1
  • Note
    Swappable operational amplifier:
    ●I/V: LME49720 x 2
    ●LPF: LM4562 x 1

    Output impedance:
    ●Line out: 100 ohm
    ●Headphone out: 10 ohm

    ●Crystal clock: 12MHz
    ●Oscillator: 45.1584MHz (44.1kHz);49.152MHz (48kHz)

    Power supply type:
    ●Power consumption(Max): 12W
    ●Power input jack: DC in 12V
    ●Power input range: AC 90~264V


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