Fosi Audio ZA3 Balanced Stereo Amplifier

About The Fosi Audio ZA3 Balanced Stereo Amplifier

The Fosi Audio ZA3 is a next-generation powerhouse that blends flexibility, precision, and style into one compact package. As the brand’s first amplifier to support both stereo and mono modes, it’s built to adapt to your setup - whether you want rich, detailed stereo playback or the extra punch of a mono configuration. With up to 180W per channel in stereo or a thumping 235W in mono, plus balanced inputs to keep your signal clean and noise-free, the ZA3 is a serious step forward for Fosi. Add in its premium audiophile-grade components, refined cooling design, and thoughtful features inspired by user feedback, and you’ve got an amp that’s as smart as it is powerful.

Dual-Mode Innovation

This new generation mini amplifier offers both stereo and mono modes, and 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 ground breaking heat dissipation design, Fosi upgraded the 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.

Our Review

The Fosi Audio ZA3 is a compact yet mighty amplifier that combines smart design, serious power, and audiophile finesse in one sleek package. As Fosi’s first model to offer both stereo and mono modes, it’s built to suit whatever your setup demands - from rich, spacious stereo sound to the extra muscle of a mono configuration. With up to 155W per channel in stereo or a hefty 235W in mono, plus balanced inputs for a clean, noise-free signal, the ZA3 delivers performance that punches well above its size. Premium components like the TPA3255 chip, high-grade capacitors, and precision inductors keep the sound clear, dynamic, and distortion-free, while the upgraded cooling system ensures it stays stable even under heavy use. It’s a thoughtful, flexible, and powerful little amp that shows just how far Fosi has pushed their craft.

Main Features & Specifications

• Design: Compact High Performance Balanced Stereo/Mono Amplifier
• Output Power
  • Stereo: 2 x 155 Watts @ 4Ω
  • Mono: 1 x 235 Watts @ 4Ω
• Input Modes: Single Ended RCA, Balanced XLR, ¼” TRS
• Output Modes: Speaker Output (supports banana plug or bare wire connection), Active Subwoofer Output
• Frequency Range: 20Hz-20kHz (±0.1dB)
• (THD) Total Harmonic Distortion: ≤0.006%
• (SNR) Signal to Noise Ratio: ≥106dB
• (SINAD) Signal to Noise and Distortion: 89dB
• Dynamic Range: ≥106dB
• Chip Set: Texas Instruments TPA3255 Amp Chip
  
• Power Supply: 48V 5A
• DC Input Range: 24-48V
• Included Accessories: 48V/5A Power Adaptor, User Manual
• Dimension (WxHxD): 155 x 51 x 184mm
• Weight: 0.83 kg
• Manufacturer's Warranty: 2 Years

Note: Features & Specifications Subject To Change Without Notice. E&OE.