HPA-3U⁺ is a biggest evolution since the M-Stage series headphone amplifier came out, the new appearance, the new circuit design and radical performance improvement to make it all difference.


Full-band of THD + N less than 0.0003%, SNR up to -112dB, bandwidth not less than 150k at -3dB gain, 0.2Ω ultra low output impedance, three gain level options to fit for the different impedance and sensitivity headphone, all of these excellence performance improvements to be born the brand new HPA-3U⁺!


The most stable XMOS U series USB controller on the new USB module, support 24 bit/192kHz sample rate PCM and 1Bit/5.6MHz DSD audio stream playback, it compatible with DoP and ASIO Native working modes, the biggest bright spot is that can be played with your iOS and the most Android devices.

Excellent structural design to quickly dissipate the heat of power transistors via the shell, to ensured the stability of the work; full symmetric circuit layout makes two channels audio have the isometric path; driver stage use the precision constant current source and establish stable working point; Parallel output of the output stage can effectively reduce the output impedance, and improved driving capability, extended dynamic range.


Alps 27 series volume potentiometer, Wima and Nichicon audio gradecapacitors, Noratel toroidal transformer, precision non-inductive resistance, each carefully selected components make HPA-3U⁺ not only presents the perfect sound, but also a more stable and reliable.

Matrix Audio HPA-3U⁺ Class A Headphone AMP & USB DAC

Colour: Black
  • Line Output

    SNR: >-112dB at 20Hz-22kHz A-Weighting

    THD+N: <0.0003% at 1kHz 1VRMS A-Weighting

    Frequency Response: 20Hz-20kHz(+0.01dB/-0.04dB)

    Output Impedance: 51ohms


    Headphone Output

    SNR: >-112dB A-Weighting

    THD+N: <0.0003% at 33ohms 90mW 1kHz A-Weighting

    Frequency Response: 20Hz-20kHz(+0.01dB/-0.04dB)

    Output Impedance: 0.2ohms

    Output Power: 2800mW at 33ohms / 420mW at 300ohms / 210mW at 600ohms at THD+N=0.01%


    Gain Control

    Gain: 5=5dB 10=10dB 20=20dB


    USB Input

    USB Chip: XMOS U-Series Asynchronous USB Chip

    D/A Chip: CIRRUS LOGIC CS4398

    SNR: >-110dB A-Weighting

    THD+N: <0.0009% at 1kHz A-Weighting

    PCM Sample Rate: 16-24Bit /44.1kHz 48kHz 88.2kHz 96kHz 176.4kHz 192kHz

    DSD Sample Rate: DSD2.8MHz/DSD5.6MHz(DoP and ASIO Native)


    System Support

    Windows XP/Vista/7/8/8.1 systems need to install the driver supplied

    Mac OS X 10.6.4 and above version have native support and do not require a driver

    Can be used with the most of Android devices via the OTG cable

    Can be used with iOS devices via the Lightning to USB Camera Adapter



    Power Voltage:

    230V position is fit for AC220V-240V 50/60Hz

    115V position is fit for AC100V-120V 50/60Hz

    Power Consumption: <25W

    Fuse: AC250V/500mA 5×20mm



    Dimension: 285×142×49mm L×W×H(Including the protruding part)

    Weight: 1.7kg



    Driver&User Manual Disk: ×1

    Power Cord: ×1

    USB Cable: ×1


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