Fosi Audio ZA3 Stereo Amplifier, Mini 2-Channel Amp for Subwoofer, Home Theater, Passive Speakers, 48V Power Supply
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Fosi Audio ZA3 Stereo Amplifier, Mini 2-Channel Amp for Subwoofer, Home Theater, Passive Speakers, 48V Power Supply

|7 ratings
Fosi Audio ZA3 Stereo Amplifier, Mini 2-Channel Amp for Subwoofer, Home Theater, Passive Speakers, 48V Power SupplyFosi Audio ZA3 Stereo Amplifier Mini 2 Channel Amp for Subwoofer Home Theater Passive Speakers 48V Power Supply
SizeZA3

Key item features

  • Versatile Modes: Offers dual-mode innovation with stereo output up to 155W and mono output up to 235W, allowing flexible adaptation for diverse audio needs.
  • Enhanced Connectivity: Features balanced input with XLR and 1/4" TRS support to minimize interference, and a 12V trigger-in for synchronized device operation.
  • Premium Components: Utilizes a TPA3255 Class-D amp chip, Japanese NCC, ELNA, German WIMA capacitors, and Japanese Sumida inductors for exceptional audio quality.
  • Optimized Cooling: Incorporates an upgraded heat dissipation system with a larger chassis, side vents, and dust covers for sustained high power output stability.
  • Customizable Sound: Supports op-amp rolling with five swappable DIP8 dual op-amps for personalized sound tuning and enhanced audio experience.
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Specs

Audio power amplifier class, Class D AmplifierRms power rating, 155 WSpeaker config., 2.0Peak audio power handling, 500 WBrand, Fosi AudioRec. use, Studio, Commercial, Residential

About this item

Product details

Fosi Audio ZA3 Balanced Stereo Amplifier Home Audio Component Mini 2 Channel Mono Amp TPA3255 is designed for audiophiles seeking superior sound quality and versatility. Featuring dual-mode innovation, it delivers up to 155W in stereo mode and 235W in mono mode, making it ideal for subwoofer desktop setups, home theaters, and passive speakers. With balanced input and trigger-in connectivity, the ZA3 minimizes interference and streamlines device synchronization. Built with audiophile-grade components like Japanese NCC capacitors and the TPA3255 Class-D amp chip, it ensures exceptional clarity and low distortion. Enhanced heat dissipation and op-amp rolling capabilities allow users to customize their audio experience, making the ZA3 a perfect choice for bookshelf, tower, and floorstanding speakers.
  • Dual-Mode Innovation: This new generation mini amplifier offers both stereo and mono modes, adapts flexibly to your diverse needs, allowing seamless mode switching. In stereo mode, it delivers a robust output of up to 155W, while in mono mode, the power soars to a maximum of 235W. Pair two ZA3 units in mono configuration to create a powerful audio system, significantly enhancing your listening experience.
  • Richer Connectivity: Debut amplifier with balanced input and trigger in, the ZA3 features a balanced combo audio signal input connector supporting both XLR and 1/4" TRS plugs. This design minimizes interference and reduces noise floor. The 12V trigger-in connector enables synchronization with other devices, streamlining the process of turning on/off without individual operations.
  • Audiophile-Grade Components: The ZA3 features the TPA3255 high-end Class-D amp chip and utilizes premium Japanese NCC, ELNA, and German WIMA capacitors, and Japanese Sumida inductors for exceptional audio quality. With a SINAD rating of up to 89dB, an SNR of up to 106dB, and a low noise floor of only 150μV, it delivers exceptional clarity and low distortion.
  • Advanced Heat Dissipation: Based on V3's groundbreaking heat dissipation design, we upgraded ZA3's cooling system by featuring a larger chassis, moving vents to the sides, and adding dust covers to achieve better ventilation for a sustained and stable high power output.
  • Enhanced Scalable Fun: Personalize your audio experience with the op-amp rolling feature! The ZA3 stocks five swappable op-amps for left and right channel outputs, balanced input, and subwoofer output. Experiment with compatible DIP8 dual op-amps such as Sparkos SS3602, MUSES02, OPA2604, OPA2134PA, OP249, AD827, RM4558, LM4562, LME49720HA, etc. to fine-tune your sound to perfection.
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Specifications

Audio power amplifier class

Class D Amplifier

Rms power rating

155 W

Speaker config.

2.0

Peak audio power handling

500 W

Warranty

Warranty information

24-Month Warranty

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Customer ratings & reviews

5 out of 5 stars
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Showing 1-3 of 4 reviews

Oct 27, 2025
Reviewer name: Ryan
Item details
Size: ZA3+ZD3
Sold and shipped byFosi Audio
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Great bang for the buck!

This is the best DAC you can get for the money. The amp is powerfully and rock solid. I currently own a ZP3, ZD3 and two ZA3's. Paired with Klipsch rp-600m, rp-250c and r-10sw.

Incentivized Review
Helpful?6BT121U42K3L5232128654
Feb 17, 2026
Reviewer name: scott
Item details
Size: ZA3
Sold byFosi AudioDelivered byWalmart
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

good good good

just as reviewers said, it sounds

Incentivized Review
Helpful?6BT121U42K3L5232128654
Mar 27, 2025
Reviewer name: Stephen
Item details
Size: ZA3
Sold and shipped byFosi Audio
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Very surprising and powerful

very nice build quality and sound. i have 2 units set up in mono mode and the sound stage is wide very detailed. shipping was fast must have been in a warehouse in the area. i would recomend this amp as it sounds as good as my reference setup 150 Wpc class A\B power. Find it hard to believe the sounds that these little amps produce they drive my Canton Crono's with no issues. i purchased mine with the 48 volt 5 amp power supply. I listened to music in the 70 to 90 db level with no issues

Incentivized Review
Helpful?6BT121U42K3L5232128654
Current price is $149.99
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4.3 stars out of 5, based on 2003 seller reviews(4.3)
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