Price: $179.99 - $142.49
(as of Aug 19, 2025 12:11:55 UTC – Details)
Product description
The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. 2 Channel Amp Merchant Video
Amplifying Your Voice, Shaping Our Innovation
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.
Input: RCA, XLR, ¼”TRS; Output: Stereo, MonoFrequency Response: 20Hz-20kHz (±0.1dB); Rated Power Output: Stereo 180W*2 @4Ω; Mono 235W @4ΩPower Adpater Dimensions：7.6 x 3.54 x 1.5in
SNR≥106dB; THD<0.006%; SINAD: 89dB
Flawless XLR Balanced Input Support
Delivers pure sound, initiating a high-definition auditory adventure with unmatched clarity.
PBTL Mono Mode Support
More power output to elevate your stereo HiFi system to new heights.
1 Home Audio System
2 XLR Input
3 Monoblock
4 Stereo Mode
5 Mono Mode
TI TPA3255 Amp Chip Integrated
Enabling superior sound and ultra-low distortion across the audio band with Class-D efficiency.
12V Trigger Sync Interface (3.5mm)
Easy one-click power management with smooth sync across devices, unifying your audio system.
1 TPA3255 Chip
2 High-End Components
3 Front Panel
4 Rear Panel
5 Vents
Swappable Op-Amps
Compatible with DIP8 dual op-amps. Roll them to get your preferred sound signature.
Advanced Heat Dissipation Design
Enhanced cooling with larger chassis, whole-body heatsink, and side ventilation with dust covers.
Separated Digital & Analog Modules
Optimized circuit board layout protects core audio modules from interference for a purer sound.
Logarithmic Potentiometer
Helps to achieve a fine volume tuning to match human ear’s auditory characteristics.
1 Power Rating
2 Op-Amps
3 Heat Dissipation
4 Circuit Board
5 Taper A Pot
Fosi Audio ZA3 Friendly Solution Guide
1. Addressing Functional Issues
Left Channel and Mono Setup Problems:
–Mode Selection: Ensure you’ve selected the correct mode using the switch on the right side of the ZA3. For stereo sound, the switch should be in the downward position; for mono, it should be upward; –Cable Connections: Double-check all input and output cables for secure connections. Faulty or improperly connected cables can cause sound issues； –Power Supply: Make sure you’re using the appropriate power supply for your device.
Power On/Off Issues: Power Switch Operation: To turn your ZA3 on or off, press and hold the volume knob for 2 seconds. This feature might be different from other devices you’ve used, so it’s important to familiarize yourself with this operation.
2. Enhancing Audio Sound Quality
Insufficient Power and Sound Output: –Volume Adjustment: If the sound is too low, try turning the volume knob clockwise to increase the volume to an appropriate level; –Power Supply and Mode: Understand that the power output varies with different power supplies, speaker impedances, and operating modes. Adjust accordingly to achieve the best sound quality.
Not Meeting Expectations: –Audio Source Quality: For better sound, use high-quality audio files and avoid compressed formats like MP3, which can sound worse when amplified. –Speaker Placement: Position your speakers at least 30cm away from walls or corners to avoid muddy bass sounds. –Subjective Perception: Remember that audio quality can be subjective. Experiment with different audio sources and settings to find what sounds best to you.
3. Overcoming Compatibility Limitations: Incompatibility with Speakers or System: Check Impedance: Ensure your speakers’ impedance is within the 2 to 8 ohm range supported by the ZA3 for optimal performance.
Lack of Additional Inputs and No Signal Output: Input Options: The ZA3 supports RCA and XLR inputs. It does not have a DAC function, so it won’t provide a signal output. Make sure your audio source is compatible with these inputs.
Power Adapter Size: Adapter Purpose: The 48V/5A power adapter is designed to meet the higher power requirements of the amplifier, ensuring it delivers its full potential. Its larger size is necessary for this purpose.
Crafting Your Dream Audio System
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Customer Reviews
4.7 out of 5 stars 712
4.5 out of 5 stars 1,288
4.6 out of 5 stars 1,160
4.5 out of 5 stars 1,307
4.6 out of 5 stars 189
4.5 out of 5 stars 78
4.5 out of 5 stars 23
Price
$142.49$142.49
$79.99$79.99
$89.99$89.99
$49.99$49.99
$170.99$170.99
$94.99$94.99
$89.99$89.99
Type
2.0 CH Mono Amp
2.0 CH Amp
2.0 CH Amp
2.0 CH Amp
DAC+ Preamp
Preamp
DAC
MAX Power Output
190W x2/ 300W x1
300W x 2
300W x 2
50W x 2
–
–
–
Input
RCA+XLR+¼”TRS
RCA
RCA
RCA
USB+HDMI (ARC)+COA+OPT+BT
3 RCA
OPT + COA + USB
Output
Passive SPK +Sub-out
Passive Speakers
Passive Speakers+Pre-Out
Passive Speakers
XLR + RCA
RCA + Pre-Out
RCA + Powered Subwoofer Output
Treble & Bass Control
✘
✔
✘
✘
✘
✔
✘
THD
<0.006%
≤ 0.3%
<0.003%
≤ 0.04%
<0.00008%
≤ 0.003%
≤0.00012%
SNR
≥106dB
≥ 90dB
≥110dB
≥ 98dB
≥126dB
≥ 110dB
≥121dB
Terminating Impedance
2-8 Ohm
2-8 Ohm
2-8 Ohm
2-8 Ohm
—
—
—
Power Adapter
48V/5A
32V/5A
32V/5A
19V/4.74A
12V/1.5A
12V/1.5A
—
Work Voltage
AC 110V – 240V
AC 110V – 240V
AC 110V – 240V
AC 110V – 240V
DC 12V
DC 12V
DC 5V
Dual-Mode Innovation: This new generation mini amplifier offers both stereo and mono modes, adapts flexibly to your diverse needs, allowing seamless mode switching. In stereo mode, it delivers a robust output of up to 180W, 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 groundbreaking heat dissipation design, we upgraded 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
Enhanced Scalable Fun: Personalize your audio experience with the op-amp rolling feature! The ZA3 stocks five swappable op-amps for left and right channel outputs, balanced input, and subwoofer output. Experiment with compatible DIP8 dual op-amps such as Sparkos SS3602, MUSES02, OPA2604, OPA2134PA, OP249, AD827, RM4558, LM4562, LME49720HA, etc. to fine-tune your sound to perfection
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