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The Fosi Audio ZA3 is a breakthrough in compact high-fidelity amplification. Engineered for enthusiasts who demand precision and versatility, it features a fully balanced architecture and the high-end Texas Instruments TPA3255 chip. Whether used as a standalone stereo amp or paired as dual-mono blocks, the ZA3 delivers a level of sonic transparency usually reserved for high-end rack gear.
Dual-Mode Versatility: The ZA3 is a "chameleon" in your setup. Use it in Stereo Mode for a classic 2.0 desktop system, or flip the switch to Mono Mode to harness massive power for a single speaker. This allows you to scale your system by adding a second ZA3 later for a true dual-mono configuration.
Subwoofer Out: Includes a dedicated active subwoofer output with a built-in crossover, making it easy to create a powerful 2.1 or 0.1 home theater foundation.
XLR Balanced Input: To ensure a noise-free signal, the ZA3 features XLR balanced inputs that reject electromagnetic interference, ideal for long cable runs and professional DAC connections.
Premium Internal Hardware: Built with high-quality Japanese NCC and ELNA capacitors and German WIMA inductors, ensuring a stable power supply and a refined, airy high-end.
Replaceable Op-Amps: Features DIP8 sockets for Op-Amp rolling. Enthusiasts can swap the stock TI NE5532 for Muses02 or OPA2134 to fine-tune the sound texture.
Reinforced Cooling: The entire CNC aluminum chassis acts as a giant heatsink, complemented by an innovative side-ventilation design to ensure stable performance even during high-output sessions.
| Component | Specification |
| Amp Chip | Texas Instruments TPA3255 |
| Power Output | Stereo: 155W x2 @4Ω / Mono: 235W @4Ω |
| Input Mode | XLR Balanced, RCA Unbalanced |
| Output Mode | Speaker Out, Subwoofer Out |
| Frequency Response | 20Hz - 20kHz (±0.1dB) |
| SNR / THD | ≥ 106dB / ≤ 0.006% |
| Op-Amp | TI NE5532 (Replaceable) |
The Fosi Audio ZA3 represents the evolution of Class D amplification. It bridges the gap between affordable desktop audio and high-end Hi-Fi. By supporting balanced inputs and providing a Mono-block option, it gives you a professional path to upgrade your audio system without replacing your entire setup.
The next generation balanced dual-mode Class-D power
amplifier. Fosi Audio's first amplifier supporting both stereo
and mono modes.
At Fosi Audio, behind every innovation, there's a story. The birth of the ZA3 amplifier is just such a story, centered around our users. After the launch of the V3 amplifier, we gathered innumerable feedback from passionate audiophiles. They expressed a desire for us to develop an even better amplifier based on V3.
Enabling superior sound and ultra-low distortion across the audio band
with Class-D efficiency.
Compatible with DlP8 dual op-amps. Roll them to get your preferred sound
signature.
Replacing the op amps for both left and right channels in stereo mode, regardless of RCA or XLR inputs, will notably enhance sound quality.
Mono Mode: Only replacing the op amps for the right channel.
Using XLR input mode allows for further sound quality enhancement by replacing the op amps for the XLR channel.
If a subwoofer is connected, there's the option to replace the op amps responsible for the subwoofer channel.
Note: Carefully align the notch/the number '1' on the chip's cover with the 'O1' mark on the PCB.
Here is a tutorial video for your reference: https://youtu.be/VvYYwxAfBi4
