AliexpressThe Fosi Audio ZA3 is a compact class-D passive-speaker amplifier built around a TPA3255 amplifier chip. This selected variant contains one ZA3 amplifier and a user manual, but no power supply. It is intended for a compact desk or stereo system using analog sources and two passive speakers. Check the complete system requirements before ordering, because the amplifier needs a separately purchased DC supply and compatible connections.
Connections and system role
The ZA3 provides analog RCA inputs and balanced XLR/TRS combo inputs. Its speaker binding posts connect to passive speakers, while the subwoofer output is intended for an active powered subwoofer with its own amplifier. A 12V trigger input supports compatible system control. One amplifier operates in stereo for two passive speakers; dual-mono operation requires two amplifiers and suitable power supplies.
- Use a suitable analog source output or a separate DAC for a computer.
- Match speaker impedance, load, and wiring to the manufacturer’s guidance.
- Turn the system off before connecting or changing speaker wiring, then begin with the volume low.
- Balanced inputs may help with a particular system, but they do not guarantee an audible improvement or eliminate every noise source.
Specifications
| Model | Fosi Audio ZA3 |
|---|---|
| Amplifier type | Class-D passive-speaker amplifier |
| Amplifier chip | TPA3255 |
| Input connections | RCA and balanced XLR/TRS combo |
| Speaker configuration | Stereo or mono mode |
| Other connections | Passive-speaker binding posts, active-subwoofer output, 12V trigger input |
| Power requirement | Compatible 24–48V DC supply, purchased separately |
What is included
The selected No Power Supply package includes one ZA3 amplifier and one user manual. It does not include a PSU, P3 preamp, second amplifier, power adapter, speakers, or audio and speaker cables. Images showing additional equipment or a paired setup should not be treated as package contents.
Practical limitations and buying checks
This is not a USB DAC, Bluetooth receiver, Wi-Fi streamer, or headphone amplifier. Do not connect a passive subwoofer as though the subwoofer output supplies speaker power. Before buying, confirm that your source has a suitable analog connection, select a reputable DC supply with the appropriate connector, polarity, and current capability for the manufacturer’s requirements, and budget for speakers, speaker leads, source cables, and the PSU. No measured sound quality, distortion, SINAD, or output-wattage result is established here; manufacturer performance estimates vary with test conditions and power supply.
US listing and buying checks
Price checked: November 7, 2026. Observed listing price: 87.30 USD. The selected No Power Supply; one ZA3 amplifier from Fosi Audio Official Store showed free US shipping. Estimated delivery was November 14–22, 2026. The checked signed-in account allowed up to three items at the displayed price. This was a product-page observation, not a completed checkout or a delivery guarantee. Reselect the exact option, confirm shipping to your address, and review taxes and final charges. AliExpress prices vary by variant, seller, account, destination, promotion and time.
For context, see our guide to different types of audio upgrades. For sale timing, use the November sale calendar; check the US promo-code catalog separately. No coupon has been checkout-verified for this selected item.
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