Is it possible to use the trigger out from the Fosi Audio ZD3 to two pieces of ZA3 amplifiers?

Yes, use a dual 3.5mm male splitter cable to trigger the ZA3 to switch on synchronously.

How to set up a system using two ZA3 units in mono mode?

- Connect the RCA (XLR) cables to the right-channel RCA (XLR) input ports of the two ZA3 units, and link the speaker wires to the right-channel binding posts.

ZA3 recommendations for replacing op-amps in mono mode?

If you're using RCA mode, please replace only the right op-amp. For XLR mode, swap the right and XLR channel op-amps.

No front light on ZA3 though there is light on the ac adapter.

Long press the volume button for 2 seconds to power it on.

The power on LED light on my ZA3 is dead.

Check if the LED is misaligned with the front panel hole, especially if the op-amp was recently changed. Misalignment could cause the LED not to be visible through the case.

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ZA3 Balanced Stereo Amplifier Home Audio Component Mini 2 Channel Mono Amp TPA3255 for Subwoofer Desktop Home Theater Bookshelf Tower Floorstanding Passive Speakers with 48V Power Supply

ZA3 Balanced Stereo Amplifier Home Audio Component Mini 2 Channel Mono Amp TPA3255 for Subwoofer Desktop Home Theater Bookshelf Tower Floorstanding Passive Speakers with 48V Power Supply

Product ID: 593516480

Details

Item dimensions L x W x H
6.1 x 7.24 x 2
Manufacturer
Fosi Audio
Maximum Supply Voltage
48 Volts (DC)
Minimum Supply Voltage
24 Volts (DC)
Voltage
48 Volts

⚡235W max power output

🔗Balanced XLR/TRS inputs

❄️Advanced heat dissipation

SAR 849

Duties & taxes included

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Description

🎧 Power your passion with precision and style.

CUSTOMIZABLE SOUND TUNING - Swap op-amps to personalize your audio signature and stand out in your sound community.
NEXT LEVEL COOLING SYSTEM - Enhanced chassis design with side vents and dust covers ensures stable high-power performance.
DUAL MODE POWER FLEXIBILITY - Switch effortlessly between 180W stereo and 235W mono modes to match your audio setup.
AUDIOPHILE APPROVED COMPONENTS - Premium TPA3255 chip with Japanese and German capacitors delivers pristine, low-distortion audio.
PRO GRADE BALANCED CONNECTIVITY - XLR and 1/4" TRS inputs reduce noise for crystal-clear sound in any environment.

The Fosi Audio ZA3 is a compact, high-performance stereo amplifier featuring dual-mode operation with up to 235W output, balanced XLR/TRS inputs for noise-free connectivity, and premium audiophile-grade components. Its advanced heat dissipation system ensures reliable, sustained power, while the op-amp rolling feature offers customizable sound tuning, making it ideal for desktop, home theater, and bookshelf speaker setups.

Specifications

ASIN	B0CLP4T5L7
Best Sellers Rank	#6,356 in Electronics ( See Top 100 in Electronics ) #26 in Audio Component Amplifiers
Brand Name	Fosi Audio
Customer Reviews	4.6 4.6 out of 5 stars (1,279)
Included Components	Fosi Audio ZA3 Power Amplifier x1；48V5A Power Adapter x1；User Manual x1
Item Dimensions	6.1 x 7.24 x 2 inches
Manufacturer	Fosi Audio
Maximum Output Power	235W
Maximum Supply Voltage	48 Volts (DC)
Minimum Supply Voltage	24 Volts (DC)
Model	ZA3
Mounting Type	Surface Mount
Number of Channels	2
Output Power	235 Watts
Package Type Name	Cardboard Box
Part Number	ZA3
Specification Met	FCC
Unit Count	1.0 Count
Voltage	48 Volts
Warranty Description	24-month manufacturer

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