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

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 & single-ended inputs

🧊Advanced full-body heat dissipation

238580CFA

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Description

🎶 Power Meets Precision — Elevate Your Sound Game with Fosi Audio V3 Mono!

REVOLUTIONARY PFFB TECH - Experience ultra-low distortion and enhanced frequency response with cutting-edge Post-Filter Feedback.
AUDIOPHILE GRADE POWERHOUSE - Unleash 240W of crystal-clear Class D amplification for your premium home audio setup.
COOL EFFICIENT PERFORMANCE - Stay worry-free with innovative heat dissipation and auto signal sensing for energy-smart operation.
CUSTOMIZABLE SOUND SIGNATURE - Swap DIP8 op-amps to tailor your audio vibe — from Sparkos to Burson, your sound, your rules.
EFFORTLESS MULTI CHANNEL INTEGRATION - Seamlessly build 2-5 channel systems with flexible mono block design and balanced inputs.

The Fosi Audio V3 Mono is a compact yet powerful Class D amplifier delivering up to 240W at 4Ω, engineered with advanced PFFB technology to minimize distortion and maximize sound fidelity. Featuring premium Japanese and German components, balanced RCA/XLR inputs, customizable op-amps, and a smart cooling system, it’s designed for audiophiles seeking high-performance, flexible, and energy-efficient home audio amplification.

Specifications

ASIN	B0D31M3DXY
Best Sellers Rank	#40,432 in Electronics ( See Top 100 in Electronics ) #111 in Home Audio Amplifiers
Brand Name	Fosi Audio
Country Of Origin	China
Customer Reviews	4.3 4.3 out of 5 stars (308)
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 Output Power	240 watts
Maximum Supply Voltage	48 Volts (DC)
Minimum Supply Voltage	48 Volts (DC)
Model	V3 Mono
Mounting Type	Freestanding
Number of Channels	1
Number of Items	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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