Polsen HPA-4X2 4-Channel Stereo Reference Headphone Amplifier
SKU: 45864144400

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

Sale price$3690.00 Regular price$4100.00
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Description

Polsen HPA-4X2 4-Channel Stereo Reference Headphone AmplifierFor Pro & Project Studio Applications Durable & Compact Design 1x 1 4" TRS Stereo Input Stereo RCA Inputs 4x 1 4" Stereo Headphone Outputs Low Noise Circuitry Independent Amp Circuits Per Channel Link Feature Daisy Chains Multiple Units Stereo Mono Switch Includes 4x Mini Plug Adapters 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

  • For Pro & Project Studio Applications
  • Durable & Compact Design
  • 1x 1/4" TRS Stereo Input
  • Stereo RCA Inputs
  • 4x 1/4" Stereo Headphone Outputs
  • Low-Noise Circuitry
  • Independent Amp Circuits Per Channel
  • Link Feature Daisy Chains Multiple Units
  • Stereo/Mono Switch
  • Includes 4x Mini Plug Adapters

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. Each of its four channels features independent volume control in the form of a volume knob as well as independent amp circuits, allowing for a wide frequency response of 20 Hz to 20 kHz and low distortion at high volumes, while assuring no signal loss when all 4 headphone outputs are used simultaneously. 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. It mono button allows for mono signal compatibility. For its headphone outputs, it features four 1/4" TRS connectors. To assure compatibility with a variety of headphones, Polsen includes four 1/8" 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 1/8" 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
Included stereo mini cable for connecting devices with 1/8" output (use included 1/4" adapter)
UPC: 847628577695
Channels 4
Input Connections 1x 1/4" (6.3 mm) TRS master input
1x L,R RCA
Output Connectors 4x 1/4" (6.3 mm) TRS headphone outputs
Maximum Input Level +14 dBV
Maximum Output Level 22 dB, per channel
Input Impedance 1 k?
Output Impedance Minimum 10 ?, per channel
Signal to Noise Ratio >98 dB
THD <0.007%
Power 12 V DC, 150 mA
Dimensions (L x W x D) 3.00 x 3.75 x 1.20" (76 x 95 x 30 mm)
Weight 10.4 oz (295 g)
Packaging Info
Package Weight 1.3 lb
Box Dimensions (LxWxH) 7.2 x 3.9 x 2.5"
In the Box
Polsen HPA-4X2 4-Channel Stereo Reference Headphone Amplifier
  • Stereo Mini Male to Stereo Mini Male Cable
  • 4 x 1/8" (3.5 mm) Stereo Mini to 1/4" (6.3 mm) TRS Stereo Adapter
  • DC 12 V/150 mA Power Supply
  • Limited 1-Year Warranty
All product and company names are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 45864144400

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4.3 ★★★★★
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A
Verified Purchase
Amazon Customer
Carnegie, US
★★★★★ 5
Flexibility and clean desk space!!!
Bought three of these for my home office. Two for Synology NAS drives and one for a Mac Studio. The size ranges make this the perfect product to get everything off my desk. A little difficult to install with the desk upright so I suggest turning it on its side or over completely. In my case, I have these in sit stand desks which is great.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 24, 2025
W
Verified Purchase
William Lech
Port Orchard, US
★★★★★ 4
Decent bracket, Non-beveled screw holes cause complications
The screws that secure the mount to the underside of the desk stick out enough to cause the inner dimensions to change. I had to use the next hole down to increase the size of the bracket to accommodate my device, resulting in a less secure mount than desired. If the holes were beveled so that the screws fit more flush with the mount I'd be able to give it 5 stars. But the inner dimensions are not entirely as advertised due to the screws. Quality is up to standard otherwise, installation is relatively straightforward, price point is fine for a bracket of this size.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 18, 2025
K
Verified Purchase
Kris
Natrona Heights, US
★★★★★ 5
Great mount!
Great under desk NAS mount. Adjustable and sturdy, easy to install. Worked well for my Qnap TR-004 four slot DAS. I used 5/64 drill bit for the holes. Since my desk has a rear lip I reused rear stopper bit as a headphone hanger. I bend it slightly to a hook shape.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 6, 2025
B
Verified Purchase
Brian
Draper, US
★★★★★ 5
Tucks my NAS away
Sturdy and a major space saver. Worth the money to free up valuable desk space. Held my 6 bay QNAO NAS perfectly. Highly recommend.
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Reviewed in the United States on November 28, 2025
C
Verified Purchase
Christopher Shaw
Carnegie, US
★★★★★ 5
Perfect for under-desk NAS/DAS
Worked perfectly for my TerraMaster D320 DAS
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 20, 2026

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