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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Fosi Audio 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

Fosi Audio 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: 593516485

Details

Item dimensions L x W x H
15.5 x 18.4 x
Manufacturer
Fosi Audio
Maximum supply voltage
48 Volts (DC)
Minimum supply voltage
24 Volts (DC)
Voltage
48 Volts

🔊235W max power output

🔗Balanced XLR & 1/4" TRS inputs

❄️Advanced heat dissipation system

COP 1111385

Duties & taxes included

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Sold byAmazon ColombiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎶 Unleash studio-grade power in a sleek mini amp — your speakers’ new best friend!

NEXT LEVEL COOLING - Upgraded chassis with side vents and dust covers ensures stable, high-power performance without overheating.
DUAL MODE POWERHOUSE - Switch effortlessly between stereo (155W) and mono (235W) modes to match your audio setup and maximize output.
CUSTOM SOUND SCULPTING - Swap op-amps to tailor your audio signature—perfect for the discerning ear craving personalized sound.
PRO GRADE CONNECTIVITY - Balanced combo inputs (XLR & 1/4" TRS) reduce noise and interference for crystal-clear sound every time.
AUDIOPHILE APPROVED COMPONENTS - Premium TPA3255 Class-D chip with Japanese and German capacitors delivers pristine clarity and ultra-low distortion.

The Fosi Audio ZA3 Balanced Stereo Amplifier is a compact yet powerful 2-channel Class-D amp featuring up to 235W output in mono mode. It supports balanced XLR and 1/4" TRS inputs for low-noise connectivity, advanced heat dissipation for sustained performance, and customizable op-amps for personalized sound tuning. Ideal for desktop, bookshelf, or floorstanding passive speakers, it offers audiophile-grade components and flexible dual-mode operation, making high-fidelity sound accessible and scalable.

Specifications

ASIN	B0CLP4T5L7
Best Sellers Rank	#4,174 in Electronics ( See Top 100 in Electronics ) #3 in Home Audio Amplifiers
Brand Name	Fosi Audio
Customer Reviews	4.5 4.5 out of 5 stars (1,298)
Item Dimensions	15.5 x 18.4 x 5.1 centimeters
Manufacturer	Fosi Audio
Material Type	metal
Maximum Output Power	235 watts
Maximum Supply Voltage	48 Volts (DC)
Minimum Supply Voltage	24 Volts (DC)
Model	ZA3
Mounting Type	Surface Mount
Number of Channels	2
Number of Items	1
Number of Packs	1
Output Power	235 Watts
Part Number	ZA3
Specification Met	RoHS
Unit Count	1 Count
Voltage	48 Volts

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COP 1111385

Duties & taxes included

In stock

Sold byAmazon ColombiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Colombia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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