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Polsen HPA-4X2 4-Channel Stereo Reference Headphone Amplifier

BH #POHPA4X2 • MFR #HPA-4X2
34 reviews
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Polsen HPA-4X2 4-Channel Stereo Reference Headphone Amplifier
Key Features
  • For Pro and Project Studio Applications
  • Durable and Compact Design
  • 1x 1/4" TRS Stereo Input
  • Stereo RCA Inputs
The HPA-4X2 4-Channel Stereo Reference Headphone Amplifier from Polsen features a durable and compact design and can be used for a variety of professional and project applications including studio recording and stage monitoring, or any application that requires multiple headphone connections. Features include a wide frequency response of 20 Hz to 20 kHz with low distortion at high volumes and no signal loss when all 4 headphone outputs are used simultaneously. Each of its four channels allow for independent volume control. Thanks to its Link feature, you can daisy-chain multiple HPA-4X2s together to cater to your needed headphone count.
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Polsen HPA-4X2 Overview

The HPA-4X2 4-Channel Stereo Reference Headphone Amplifier from Polsen features a durable and compact design and can be used for a variety of professional and project applications including studio recording and stage monitoring, or any application that requires multiple headphone connections. Features include a wide frequency response of 20 Hz to 20 kHz with low distortion at high volumes and no signal loss when all 4 headphone outputs are used simultaneously. Each of its four channels allow for independent volume control. Thanks to its Link feature, you can daisy-chain multiple HPA-4X2s together to cater to your needed headphone count.

The unit features a 1/4" stereo TRS input and stereo RCA inputs. Its mono button allows for mono signal compatibility. For headphone outputs, it features four 1/4" TRS connectors. To assure compatibility with a variety of headphones, Polsen includes four 3.5mm to 1/4" adapters.

Durable, compact, and easy to use
High-output level for precise monitoring at high volume
Low-noise circuitry
1/4" TRS and RCA inputs
Four headphone jacks each with independent volume control
Wide frequency response (20 Hz to 20 kHz) for full-range stereo sound
Stereo/mono switch provides options for monitoring playback
Link feature to daisy-chain additional headphone amplifiers
No loss of signal when all four headphones are connected
UPC: 847628577695

Polsen HPA-4X2 Specs

Key Specs
Number of Headphone Channels
4-Channel
Headphone Output Power
Not Specified by Manufacturer
Audio I/O
1/4" (Headphone)
1/4" / RCA (I/O)
Form Factor
Tabletop
Number of Headphone Channels
4-Channel
Headphone Output Power
Not Specified by Manufacturer
Connectivity
Analog Audio I/O
4x 1/4" TRS Unbalanced Headphone Output
1x 1/4" TRS Input
1x Stereo 2RCA Unbalanced Input
Performance
Maximum Input Level
+14 dBV
Maximum Output Level
22 dB
Impedance
Inputs:
1 Kilohm
Outputs:
≥ 10 Ohms
THD+N
< 0.007%
SNR
≥ 98 dB
Power
DC Input Power
12 VDC at 150mA
Physical
Dimensions
3.8 x 3 x 1.2" / 9.5 x 7.6 x 3 cm
Weight
10.4 oz / 295.0 g
Packaging Info
Package Weight
1.05 lb
Box Dimensions (LxWxH)
8.25 x 4.85 x 2.8"

Polsen HPA-4X2 Reviews

Excellent headphone amp

By Gary
Rated 5 out of 5
Date: 2025-09-04

I have had one of these for three or four years now and it works perfectly. We are in a band that now has seven people and we have been recording at home. I needed an additional headphone amp so I bought another one of these Polsen amps. They are great. They have a jack for connecting two (or possibly more) of these in series. (Each one does need a separate power adapter). They are completely silent (no hiss) and the volume controls operate smoothly. I only have one complaint. The older one has a soft green LED on indicator light which is great. The new one has an excessively bright yellow LED. I don't understand manufacturer's obsession with putting super bright LEDs on electronic devices. Otherwise, these amps are perfect.

quality audio, solid construction

By Peter
Rated 5 out of 5
Date: 2021-12-31

With more people working from home, two or more people with this headphone amplifier can listen to a video stream without disturbing others. In a family Skype or zoom call, different family members can adjust the volume levels to their liking. And the sound quality is great. Attaching studio headphones to the 3.5mm analog out of my laptop provides a great sound experience, better than without extra amplification. Such a small and reasonably priced device with so many applications!

See any errors on this page?

question

Please explain the mono switch. What I'm looking for his a device that will mix the stereo channels into mono and deliver the mono signal to both headphones channels. Can this unit do that?
Asked by: Franklin B.
Yes. An input to either input jack will sum to mono on both L&R outputs (with the switch in mono ).
Answered by: Jerry O.
Date published: 2020-12-04

question

Can I connect this to the headphones out of my Allen & Heath ZED-10FX mixer?
Asked by: Mike
Yes! This is designed for multiple people to here a common audio feed and select their own volume level. We have a broadcast booth that each of our commentators have their headset plugged into this receiving the audio feed output from our mixer.
Answered by: GEORGE C.
Date published: 2018-08-25

Is it have enought impedance output for 300 Omhs ...

Is it have enought impedance output for 300 Omhs headphones?
Asked by: Danil
To drive higher impedance headphones(such as 300 ohm phones) a amplifier usually needs to produce a higher voltage swing. This is not a case of having "enough impedance for 300 ohm headphones", but of having enough voltage. Having "enough" depends on the sensitivity of the 300 ohm headphones and the voltage output capability of the amplifier, and how loud you prefer to listen. This amplifier can produce a RMS voltage swing of no more than 4.2 volts. That may be enough if you have sensitive headphones (more than 100dB/volt) and listen at safe levels. However, if your phones have low sensitivity(less than 96 dB/volt)and you want to listen at hearing-damaging heavy metal levels, then this amp won't be powerful enough.
Answered by: Nicholas
Date published: 2024-03-28

question

Will the mono switch help detect if one of the stereo channels is out of phase? In other words, if the left channel is 180 degrees out of phase from the right, this can be difficult to detect with headphones, but if the channels are summed to mono, the cancellation should be audible in each ear. Is this the case with this mono switch?
Asked by: New User U.
Since I am not aware of the circuitry they use in this box to output mono from a stereo source, it is hard to predict. However, the result will depend on what audio spectra are included in each of the (2 stereo) channels. With stereo, the left and right channel usually do not contain the same signals hence spectra, unless it is the same recorded test signal in each channel! So, what you would hear in headphones will depend on a lot of factors. If you have a way to provide an equal-power lower freq test signal to both channel inputs, then it might become obvious. Sorry, not a simple answer.
Answered by: Anthony D.
Date published: 2018-08-25

question

What exactly does Output Impedance Minimum 10 ?, per channel mean? I'm trying to find out the actual impendance output of this amp and I don't know what they mean by minimum ? Can anyone clear this up for me? Thanks.
Asked by: Anonymous
The provided specifications for this headphone amplifier are poor. The "minimum 10 ohm" spec implies that the amplifier is capable of being used with headphones with an impedance as low as 10 ohms, not that its actual output impedance is 10 ohms. Since the manufacturer does not specify actual output impedance, probably the only way to determine it is to actually measure it directly. Also, the "output level = 22dB" is totally meaningless. A figure of 22db represents a level change, not an absolute power or voltage level. A spec. of 22dBu or 22dBV defines a signal level, but "22dB" alone does not.
Answered by: Nicholas
Date published: 2026-02-05
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