Fosi Audio ZA3 Class D Integrated Amplifier

Here we have a small and simple Class D integrated amplifier from Chinese company Fosi Audio. It is in very good condition and is supplied in original packaging along with manual, PSU, mains cable plus our normal three month warranty.
Fosi Audio Say….
At Fosi Audio, behind every innovation, there’s a story. The birth of the ZA3 amplifier is just such a story, centred 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.
We listened, we reflected, and we took action. After countless design sketches, numerous prototype developments, and a comprehensive regime of rigorous testing, the blueprint of the ZA3 amplifier gradually took form. Every adjustment and detail refinement was a thoughtful response to our customers’ input. We didn’t just listen to their needs; we immersed ourselves in their passion for quality sound. Our goal was to not only meet but exceed their expectations, crafting an amplifier that embodies their pursuit of auditory excellence and aligns with our dedication to superior sound.
ZA3 is more than just a product; it’s the crystallization of joint efforts between Fosi Audio and our users. We proudly say that every customer is a co-designer behind this amplifier. From the balanced XLR input to the support for mono mode, every feature of ZA3 is crafted to meet audiophiles’ most authentic audio experience. At Fosi Audio, we believe that true innovation stems from listening to the heart, fuelled by shared passion and pursuit. ZA3 is our commitment to excellence, and a shared audio legend that we write together with you.
Integrated with the high-end Texas Instruments TPA3255 Class-D amplifier chip, when powered by a 48V PSU and connected to 4Ω impedance speakers, it delivers a rated output power of 310 watts (155 watts per channel) in stereo mode and 235 watts in mono mode. You can also pair two ZA3 amps to create a stereo system.
The ZA3 incorporates a side-vented perforated heat dissipation design, facilitating efficient air circulation and significantly enhancing heat dissipation performance. Internally, it integrates audiophile-grade capacitors, inductors, and resistors, ensuring stable output for high fidelity audio. Furthermore, the ZA3 boasts a replaceable op-amp design, enabling users to effortlessly roll between various op-amps to tailor their musical experience to individual preferences.
The ZA3 is a mini amplifier designed for audiophiles, and we believe it will take you on a delightful journey into the world of Hi-Fi music.
Specifications:
Channel: 2.0
Amplifier Chip: Texas Instruments TPA3255
Input: RCA, XLR, 1/4″ TRS
Output: Speaker Output (supports banana plug or bare wire connection), Active Subwoofer Output
SINAD: 89 dB
SNR: ≥ 106 dB
Dynamic Range: ≥ 106 dB
THD: < 0.006%
Speaker Impedance Compatibility: 2 – 8 Ω
Rated Power Output: With 48 V/5 A PSU Stereo: 155 W x 2 @ 4 Ω; Mono: 235 W x 1 @ 4 Ω
Frequency Response: 20 Hz – 20 kHz (± 0.1 dB)
Input Voltage Range: DC 24 – 48 V