No sound change after switching the gain switch?

The gain switch on the V3 MONO only works with the RCA input. When using RCA mode, switching the gain setting will noticeably change the volume. (If it's already set to RCA mode, the output level from the preamp is usually sufficient.)

Would the noise still occur if no audio input cables are connected?

Try replacing the audio source, using well-shielded audio cables, and switching to a different speaker.

Doesn't work in standby mode?

Use a separate power supply and power strip for each V3 MONO to avoid ground-loop noise affecting the standby function; if the light dims but the unit doesn't automatically shut down, please try replacing high-quality RCA cables.

V3 MONO don't have volume control or knobs?

Yes. V3 MONO is a pure power amplifier, it is recommended to use it with a DAC, preamplifier, or player with volume control.

V3 MONO is a mono channel amplifier. To achieve 2 channel amplifier effect, two V3 MONO are needed to connect two speakers.

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Fosi Audio V3 Mono Power Amplifier for Home Audio Speakers, Mini Monoblock Class D Amp with TPA3255, 240W for HiFi Home Theater AVR Receiver Component, RCA/XLR Balanced Inputs 48V/5A Power

Product ID: 643218284

Details

Item dimensions L x W x H
14.5 x 10.8 x
Manufacturer
Fosiaudio
Maximum supply voltage
48 Volts (DC)
Minimum supply voltage
48 Volts (DC)
Voltage
230 Volts

⚡240W peak power @4Ω

🔗RCA/XLR balanced inputs

🧊Full-body heat dissipation

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฿21579

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Sold byAmazon ThailandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎧 Elevate your home audio game — power, precision, and pristine sound in a sleek mini monoblock!

NEXT LEVEL COOLING - Innovative full-body heat dissipation and dual side vents keep your amp cool during marathon listening sessions.
POWERHOUSE PRECISION - Delivers a robust 240W output to drive your high-performance speakers with crystal-clear accuracy.
FLEXIBLE CONNECTIVITY - Supports both balanced XLR/¼" TRS and RCA inputs with easy gain switching for seamless integration into any setup.
AUDIOPHILE GRADE ENGINEERING - Incorporates premium TPA3255 chip and elite Japanese & German components for ultra-low distortion and pristine sound fidelity.
CUSTOMIZABLE SOUND SIGNATURE - Swap out stock op-amps to tailor your audio experience, from Sparkos to Burson, for true personalized hi-fi.

The Fosi Audio V3 Mono is a compact Class D power amplifier delivering up to 240W at 4Ω, designed for audiophiles building multi-channel home theater systems. Featuring the advanced TPA3255 chip and premium components, it achieves ultra-low distortion (THD 0.006%) and high signal clarity (SINAD 101dB, SNR 123dB). Its innovative full-body heat dissipation and dual ventilation ensure stable high-power output, while versatile RCA and balanced XLR inputs with gain selection offer flexible connectivity. Customizable op-amp support lets users fine-tune their sound signature, making it a powerhouse mini amp for serious home audio enthusiasts.

Specifications

ASIN	B0D31M3DXY
Best Sellers Rank	#13,971 in Electronics ( See Top 100 in Electronics ) #30 in Home Audio Amplifiers
Brand Name	Fosi Audio
Country Of Origin	China
Customer Reviews	4.3 4.3 out of 5 stars (282)
Included Components	Quick Start Guide
Item Dimensions	14.5 x 10.8 x 4 centimeters
Item Weight	750 Grams
Manufacturer	Fosiaudio
Material Type	Metal
Maximum Supply Voltage	48 Volts (DC)
Minimum Supply Voltage	48 Volts (DC)
Model	V3 Mono
Mounting Type	Freestanding
Number of Channels	1
Output Power	240 Watts
Part Number	un pezzo
Specification Met	CE
Supply Current	1.04 Amps
Voltage	230 Volts
Warranty Description	2 years

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