HPA-3B
EN
Manual
www.matrix-digi.com
Over view
HPA-3B is a new member of the M-Stage series headphone amplifier, who is
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the first one full-balanced design of the headphone amplifier, supports
both single-ended output and differential output, use the adaptor plug to
be worked in a single-ended input mode, maximizing the performance of
the headphones.
Full-band of THD + N less than 0.0003%, SNR up to -114dB, bandwidth not
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less than 140k at -3dB gain, 0.4Ω , 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-3B!
Excellent structural design to quickly dissipate the heat of power tube via
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the shell, full symmetric circuit layout, fully differential signal path
amplification, driver stage is the precision constant current source, the
precision quad-unit potentiometer volume control, all above features to
make it has a better dynamic range and details than a single-ended
headphone amplifier.
The customized ALPS volume potentiometer, WIMA and NICHICON audio
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grade capacitors, NORATEL toroidal transformer, precision non-inductive
resistance, ever y carefully chosen components to make HPA-3B not only
presents the per fect sound, but also a more stable and reliable working
status.
1
The Front Panel
Balance Headphone Jack
Single-ended Headphone Jack
Working LED Indicator
Volume Knob
2
The Rear Panel
Gain Switch
Left Channel XLR Analog Input
Right Channel XLR Analog Input
Power Switch
AC Power Input
3
AC Power
HPA-3B compatible with AC 100-120V and AC 200-240V two voltage
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environments. Please set the voltage switch on the right position
according to your local voltage environment before using.
The voltage switch is on the left side, the two sections of the voltage switch
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are 115V and 230V, the following is the voltage range:
115V position is fit for AC100V-120V 50/60Hz
230V position is fit for AC220V-240V 50/60Hz
Please ensure the input voltage is in the right range before using, the
incorrect voltage input can damage your device.
The fuse of HPA-3B on the left side, press down and turn the fuse plug can
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take out the fuse.
For reducing the noises and getting the best playback effect, please use the
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three-phase source wires of the power cord which includes the ground
terminal, and ensure the ground is reliable connection.
4
Settings & Usage
Power On/Off
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Connected the power plug to the HPA-3B, turn on the power switch, the
working LED indicator will light up about one second, then the HPA-3B will
enter the working status.
Input Channel
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You can use standard XLR cable connect with the HPA-3B and also can use
the accessory adaptor plug connect with the HPA-3B via RCA cable .
Gain Control
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The gain switch on the front panel, can set the gain at 5dB, 10dB or 20dB.
Volume Control
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Using the volume knob to adjust the volume, to avoid excessive volume
causes hearing damage, please make sure the volume knob on the suitable
position before power on.
Headphone Output
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There have a 4-pin XLR headphone jack and a 1/4" headphone jack, can be
connected a balance headphone and a mono headphone at same time.
5
Settings & Usage
The definition of 4-pin XLR headphone interface：
The 1/4" headphone jack is a stereo inter face, please do not connect the
mono plug into it, otherwise it will have the risk to damage your device.
HPA-3B can eliminate the power on/off impact noise with its own
protection circuit, if a failure caused the amplifier output a higher voltage
that the working LED indicator will be off, in this case, please disconnect
the headphone plug quickly from the HPA-3B to protect your headphone.
6
Technical Specification
Balance Headphone Output
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SNR: ＞-114dB A-weighting
THD+N: <0.0003% at 300ohms 135mW 1kHz A-weighting
Frequency Response: 20Hz-20kHz(+0dB/-0.05dB)
Output Impedance: 0.6ohms
Output Power : 3800mW at 33ohms at THD+N=0.01%
1500mW at 300ohms at THD+N=0.01%
800mW at 600ohms at THD+N=0.01%
SE Headphone Output
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SNR: ＞-108dB A-weighting
THD+N: <0.0004% at 300ohms 325mW 1kHz A-weighting
Frequency Response: 20Hz-20kHz(+0.03dB/-0.1dB)
Output Impedance: 0.4ohms
Output Power : 2100mW at 33ohms at THD+N=0.01%
430mW at 300ohms at THD+N=0.01%
220mW at 600ohms at THD+N=0.01%
7
Technical Specification
Gain Control
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5=5dB 10=10dB 20=20dB
Power Specifications
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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 5x20mm
Other Specifications
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Dimension: 285mm×142mm×49mm
（L×W×H, including the protruding part）
Weight: 1.7kg
NOTE: For the improvement purpose, specifications subject to changes
without prior notice.
8
Customer Service
From the purchase date, we will provide you one-year-limited warranty，
warranty does not cover accessories.
Any fault caused by quality problems during the warranty period, we will
provide free maintenance. The free maintenance do not cover by incorrect
using, negligence, accidental damage and unauthorized modifications or
replace components.
For more information, please visit www.matrix-digi.com.
9
Ver.2 01506v1 .3
Xi'a n Matrix Ele ctronic Technolog y Co., Ltd.
A809 , No.22 Feng cheng 2nd, Xi'an Ec onomic and Tec hnologic al Deve lopment Zo ne, Shaanxi, Chin a
supp ort@matrix-dig i.com
info @matrix- digi.com
+86- 29-65693537
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