Fosi Audio ZA3
- 2 reviews
- Fosi Audio
Fosi Audio ZA3
- 2 reviews
- Fosi Audio
$129.90 $109.99
- Authorized Dealer · Tech Support · 30-Day Returns
Why it stands out
Best for
Not ideal for
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Setup guide
How to connect
What you should know
EMiUZEK buying notes
Frequently asked questions
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Official product information provided by Fosi Audio
The following product descriptions, specifications and images are provided by the manufacturer.
Fosi Audio ZA3 is a balanced Class D power amplifier that operates in stereo or high-power mono mode.
Its TPA3255 platform, XLR/TRS and RCA inputs, active-subwoofer output and scalable architecture make it a flexible foundation for compact HiFi systems.
Why it stands out
Four reasons this product deserves a place in a well-planned audio system.
Stereo or Mono Operation
Use one ZA3 for a conventional stereo system or two units in mono mode for a scalable dual-mono installation.
Balanced XLR/TRS Input
The combo balanced input helps reject interference and integrates with balanced DACs and preamplifiers.
Active Subwoofer Output
A dedicated line-level output simplifies adding a powered subwoofer to a stereo system.
Replaceable Op-Amps
Socketed op-amps let experienced users experiment with compatible DIP8 dual op-amps.
Best for
- Balanced DAC and preamp systems
- Stereo passive-speaker systems
- Dual-mono amplifier upgrades
- 2.1 systems using a powered subwoofer
- Installations using 12V trigger control
Not ideal for
- Users expecting Bluetooth, USB or digital inputs
- Buyers needing a headphone output
- Passive subwoofers without their own amplifier
- Buyers who have not checked whether their variant includes a power adapter
EMiUZEK Buying Notes
- ZA3 is a power amplifier and requires an external source or preamp with suitable volume control.
- The subwoofer output is line level and is only for a powered subwoofer.
- Check the selected variant: amplifier-only, 32V/5A and 48V/5A power options are listed separately.
Frequently Asked Questions
Can one ZA3 power a stereo pair?
Yes. Use stereo mode to power left and right passive speakers from one unit.
When are two ZA3 amplifiers required?
Use two units when building a dual-mono stereo system, with one amplifier assigned to each channel.
Can it connect to an XLR source?
Yes. The balanced combo input supports XLR and 1/4-inch TRS connections.
Can it power a passive subwoofer?
No. Its subwoofer output is line level and requires a powered subwoofer.
Does it include Bluetooth or a DAC?
No. Connect an external DAC, streamer or preamplifier through RCA or balanced input.
Does every option include a power supply?
No. Verify the selected product variant before ordering.
HOW TO CONNECT
Balanced stereo system
Source: Balanced DAC or preamp
Connection: XLR / 1/4-inch TRS
Output: Speaker terminals
Target: Passive speaker pair
Note: Set ZA3 to stereo mode.
Dual-mono system
Source: Balanced DAC or preamp
Connection: One balanced channel to each ZA3
Output: Speaker terminal in mono configuration
Target: One passive speaker per amplifier
Note: Use two ZA3 units and set both to mono mode.
2.1 stereo system
Source: DAC / preamp
Connection: RCA or balanced input
Output: Speaker outputs plus sub-out
Target: Passive speakers and powered subwoofer
Note: Do not connect a passive subwoofer to sub-out.
Technical Specifications
Amplifier
| Feature | Specification |
|---|---|
| Product Type | Stereo/mono Class D power amplifier |
| Amplifier Chip | Texas Instruments TPA3255 |
| Speaker Impedance | 2–8Ω |
| Modes | Stereo / PBTL mono |
Performance
| Feature | Specification |
|---|---|
| Rated Output with 48V/5A | 155W x2 at 4Ω stereo; 235W x1 at 4Ω mono |
| Rated Output with 32V/5A | 95W x2 at 4Ω stereo; 110W x1 at 4Ω mono |
| Frequency Response | 20Hz–20kHz (±0.1dB) |
| SINAD | 89dB |
| SNR | ≥106dB |
| THD | <0.006% |
| Dynamic Range | ≥106dB |
Connectivity and Power
| Feature | Specification |
|---|---|
| Inputs | RCA; XLR / 1/4-inch TRS balanced combo |
| Outputs | Passive speakers; active subwoofer line output |
| Trigger | 12V trigger input |
| DC Input Range | 24–48V |
| Power Options | 32V/5A or 48V/5A; variant dependent |
Recommended System Setup
| Setup | Connection |
|---|---|
| Stereo HiFi | DAC/preamp → ZA3 stereo mode → passive speaker pair |
| Dual mono | Balanced preamp → two ZA3 units → passive speaker pair |
| 2.1 system | Source/preamp → ZA3 → passive speakers + powered subwoofer |
Additional Product Content
| Feature | ZA3 | V3 Mono | TB10D |
|---|---|---|---|
| Amplifier Format | Stereo / mono selectable | Monoblock | Stereo |
| Amplifier Chip | TPA3255 | TPA3255 | TPA3255 |
| Inputs | XLR/TRS, RCA | XLR, RCA | RCA |
| Stereo from One Unit | Yes | No | Yes |
| Mono Mode | Yes | Always mono | No |
| Active Subwoofer Output | Yes | No | No |
| 12V Trigger | Input | No | No |
| Tone Controls | No | No | Bass, treble |
| Op-Amp Rolling | Yes | Yes | No |
| Best Use | Flexible balanced stereo/mono | Dedicated monoblocks | Simple adjustable stereo |
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