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

BH #POHPA4X2 • MFR #HPA-4X2
33 reviews
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 as well as a stereo mini cable that, when used with one of the included adapters, allows you to connect a device with a 3.5mm output.

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
Includes stereo mini cable for connecting devices with 3.5mm output (use included 1/4" adapter)
UPC: 847628577695

Polsen HPA-4X2 Specs

Form FactorTabletop
Number of Headphone Channels4-Channel
Connectivity
Analog Audio I/O1 x 1/4" TRS Input
1 x Stereo RCA Input
4 x 1/4" TRS Headphone Output
Performance
Maximum Input Level+14 dBV
Maximum Output Level22 dB
ImpedanceInputs:
1 Kilohm
Outputs:
≥ 10 Ohms
THD< 0.007%
SNR≥ 98 dB
Power
DC Input Power12 VDC at 150mA
Physical
Dimensions3 x 3.8 x 1.2" / 9.5 x 7.6 x 3 cm
Weight10.4 oz / 295.0 g
Packaging Info
Package Weight1.195 lb
Box Dimensions (LxWxH)8.25 x 4.85 x 2.8"

Polsen HPA-4X2 Reviews

Surprisingly Great and Compact Amp

By Robert
Rated 5 out of 5
Date: 2023-01-04

I have this hooked up with my PC's Line Out with Realtek Audio Console and with my AKG K240s, sound quality is very nice. Construction of the amp is solid, all ports are secured and dials are easy to turn. I would recommend buying a four channel amp like this instead of a single channel for its versatility for use cases such as podcasting or studio work. Overall, very happy with this purchase.

Poorly Shielded, BadGround

By Alex
Rated 2 out of 5
Date: 2021-09-15

I've had this headphone amp for a few months now, and I've been able to put it to the test for many uses through my audio set up. I've listen to music, produced music, watched videos, etc. It does the job well, with different outputs from studio monitors to headphones, however since the very beginning I noticed a cross-feed from one output to another, meaning that whenever I turn up the knob for my headphones, a small amount of sound comes from the speaker output even if it is are all the way down. Now, even after a few months, I've been getting a consistent hum for all outputs. I've done my best to eliminate other interference but did not have any success until I unplug everything from it and ran the sound directly to my headphones and speakers from my interface. As such, I don't recommend getting this if you're looking for something to supplement your home studio.

Small, inexpensive, excellent sound

By Peter
Rated 5 out of 5
Date: 2021-09-06

In the category of small and inexpensive headphone amps, this one is a winner. It is well made, includes all the necessary cables and adapter plugs, is loud enough for almost any headphone and delivers pristine sound. I have used it with Teams, Skype and zoom video conferences where multiple people want to listen in with differing levels of loudness without disturbing others. Even attaching it to a laptop delivers excellent sound to a single headphone at a loudness level that exceeds what a laptop can deliver over the 3.5mm audio-out connector. I tested the amp with Sony, Sennheiser and AKG headphones and in all cases the sound was as good as can be expected.

BIG Results in a Small Package

By Neil
Rated 5 out of 5
Date: 2021-09-01

Original intent was to downsize space-wise (which it did)--HOWEVER pleasantly SUPRISED at the Audio oomph.BIG Sound in a small Package!!

This is an Amazing Product.

By Vijai
Rated 5 out of 5
Date: 2021-07-02

It can do more than you think it can do. It improves your sound so much better. It cleans the sound and make it punchy and better. I like this little piece of equipment. It is really worth it.

B&H NEVER DISAPPOINT

By Winston
Rated 5 out of 5
Date: 2021-05-28

Really needed this for my podcast setup and it works great thanks b&h

Fantastic

By Chava
Rated 5 out of 5
Date: 2022-09-29

Serves it's purpose well!

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!

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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&amp;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 &amp; Heath ZED-10FX mixer?
Asked by: Mike
Hello: Yes you can. 1. Connect direct from your headphone jack on the Zed Fx to the 1/4inch on back of your Polsen. 2. Use a left right RCA from monitor out puts to your Polsen. Either way will give you good results. #1. is the easiest way. Hope this was helpful.
Answered by: DAVID R.
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 &quot;enough impedance for 300 ohm headphones&quot;, but of having enough voltage. Having &quot;enough&quot; 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: 2023-01-08

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 &quot;minimum 10 ohm&quot; 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 &quot;output level = 22dB&quot; 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 &quot;22dB&quot; alone does not.
Answered by: Nicholas
Date published: 2019-04-15
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