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Matrix M-Stage HPA-3U+ Class A Headphone Amplifier and USB DAC (Ships in 3-4 weeks)

Matrix Audio

  • R 8,990.00
  • Save R 1,000

Matrix Audio have released the HPA-3U Plus (USB) 24bit/192kHz DSD DAC + Headphone Amplifier to their M-Stage product line

The M-STAGE HPA-3U + is a biggest evolution since the introduction of the M-Stage headphone amplifier series.

The HPA-3U+ has a new appearance and a new circuit design that results in radical improvement in audio performance.

Usability improvements include three gain level options to suit the different impedance and sensitivity of various headphones

The M-STAGE HPA-3U+ is the most stable XMOS U series USB controller on the new USB module and supports 24 bit/192kHz sample rate PCM signal playback, DOP mode DSD playback capacity and DSD ASIO Native playback.

The unit is also compatible with iOS and the most Android devices.

The M-STAGE HPA-3U+ has an excellent structural design to quickly dissipate the heat of power transistors via the shell. The driver stage uses the constant precision current source. This also ensures the stability of the unit.

The full symmetric circuit layout results in an isometric path for the audio output of the two channels. This parallel output effectively reduces the output impedance of the output stage and improves driving capability and extended dynamic range.

The M-STAGE HPA-3U + uses an Alps 27 series volume potentiometer, Wima and Nichicon audio grade capacitors, a Noratel toroidal transformer and precision non-inductive resistance.

Each carefully selected component ensures that the HPA-3U+ presents the perfect sound and also provides stabily and reliability

  • Sample rates supported USB: 16-24Bit @44.1kHz/48kHz/88.2kHz/96kHz/176.4kHz/192kHz ~ DSD64 DSD128 (DoP & ASIO Native)
    • Gain Adjustment: 5dB/10dB/20dB
    • Frequency Respone: 20Hz - 20kHz (+0.01dB/-0.04dB)
    • SNR: -112dB A-Weighting
    • Distortion: 0.0003% at 1kHz 1VRMSA-Weighting
    • Output Power: 2800mW/33Ω, 420mW/300Ω, 210mW/600Ω at THD+N=0.01%
    • Output Impedance: line out 51Ω / phones out 0.2Ω

ASIO drivers are available for: Windows XP/ Windows Vista/ Windows 7/ Windows 8 - 8.1/ Windows 10
*Apple OSX & Linux have native support and do not require a driver.

AC 115/230 volts 50/60Hz - 25 watts
Weight: 3.75lb / 1.7kg
Dimensions: 11.2" x 5.6" x 1.9" / 285mm × 142mm × 49mm

Included accessories: Disk with Driver & User Manual, PowerCord, USB Cable


Line Output

>-112dB at 20Hz-22kHz A-Weighting
<0.0003% at 1kHz 1VRMS A-Weighting
Frequency Response
Output Impedance

Headphone Output

>-112dB A-Weighting
<0.0003% at 33ohms 90mW 1kHz A-Weighting
Frequency Response
Output Impedance
Output Power
2800mW at 33ohms / 420mW at 300ohms / 210mW at 600ohms at THD+N=0.01%

Gain Control

5=5dB 10=10dB 20=20dB

USB Input

USB Chip
XMOS U-Series Asynchronous USB Chip
D/A Chip
>-110dB A-Weighting
<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
AC250V/500mA 5×20mm


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


Driver&User Manual Disk
Power Cord
USB Cable

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