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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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

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: 641505874

Details

Item dimensions L x W x H
5.71 x 4.24 x
Manufacturer
Fosi Audio
Maximum Supply Voltage
48 Volts (DC)
Minimum Supply Voltage
48 Volts (DC)
Voltage
230 Volts

⚡240W peak power @4Ω

🔊THD as low as 0.006% for pristine sound

❄️Advanced full-body heat dissipation

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VT58294

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Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Item dimensions L x W x H
5.71 x 4.24 x
Manufacturer
Fosi Audio
Maximum Supply Voltage
48 Volts (DC)

Description

🎶 Power your sound, own the room — don’t just listen, experience it!

COOL UNDER PRESSURE - Full-body heat dissipation and dual side vents keep your amp running stable during marathon listening sessions.
POWERHOUSE PRECISION - Delivers a robust 240W output to drive your high-performance speakers with crystal-clear fidelity.
CUTTING EDGE PFFB TECH - Innovative Post-Filter Feedback tech eliminates load dependency, ensuring consistent, distortion-free audio.
AUDIOPHILE GRADE COMPONENTS - Built with premium TPA3255 chip and elite capacitors for ultra-low distortion and exceptional sound clarity.
EFFORTLESS MULTI CHANNEL EXPANSION - Mini monoblock design lets you easily build 2-5 channel home theater systems tailored to your space.

The Fosi Audio V3 Mono Power Amplifier is a compact yet mighty Class D monoblock delivering 240W at 4Ω, engineered with advanced PFFB technology and premium audiophile components for ultra-low distortion and high-fidelity sound. Its innovative full-body heat dissipation design ensures stable performance during extended use, while versatile RCA and XLR inputs support seamless integration into multi-channel home theater setups. Perfect for discerning millennials craving powerful, clean audio with sleek, space-saving design.

Specifications

ASIN	B0D31M3DXY
Best Sellers Rank	#41,588 in Electronics ( See Top 100 in Electronics ) #233 in Audio Component Amplifiers
Brand Name	Fosi Audio
Customer Reviews	4.4 out of 5 stars 290 Reviews
Included Components	Fosi Audio V3 MONO Power Amplifier; 48V/5A Power Supply Unit; User Manual
Item Dimensions	5.71 x 4.24 x 1.57 inches
Item Weight	750 Grams
Item dimensions L x W x H	5.71 x 4.24 x 1.57 inches
Manufacturer	Fosi Audio
Material Type	Metal
Maximum Supply Voltage	48 Volts (DC)
Minimum Supply Voltage	48 Volts (DC)
Model	V3 Mono
Mounting Type	Surface Mount
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	24-month manufacturer

Reviews

R**Y

2.04.2026

R**S

15.09.2024

P**L

13.10.2025

G**L

18.07.2025

S**E

23.01.2026

M**D

7.08.2024

C**.

10.01.2026

W**S

18.08.2025

S**A

27.03.2026

J**D

6.01.2026

U**N

31.03.2026

G**.

22.01.2025

J**S

20.02.2026

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