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: 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 output

🔗Supports RCA & XLR balanced inputs

🧊Advanced full-body heat dissipation

R5198

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Description

🎧 Elevate your sound game — because your speakers deserve the power to impress.

COOL UNDER PRESSURE - Innovative full-body heat dissipation keeps your amp running flawlessly during marathon listening sessions.
POWERHOUSE PRECISION - Unleash 240W of crystal-clear Class D amplification for your ultimate HiFi setup.
FLEXIBLE CONNECTIVITY - Seamlessly switch between RCA and XLR inputs with gain control to tailor your audio experience.
CUSTOM SOUND SIGNATURE - Swap out op-amps like Sparkos or Burson to personalize your sonic fingerprint and stand out in your circle.
AUDIOPHILE GRADE COMPONENTS - Premium TPA3255 chip with Japanese Nichicon & German WIMA capacitors for ultra-low distortion and pristine sound.

The Fosi Audio V3 Mono Power Amplifier is a compact, high-performance Class D monoblock delivering 240W at 4Ω, designed for audiophiles and home theater enthusiasts. Featuring cutting-edge PFFB technology, premium components, and advanced cooling, it supports both balanced XLR and RCA inputs with customizable op-amps, ensuring superior sound fidelity and flexible integration into multi-channel systems.

Specifications

ASIN	B0D31M3DXY
Best Sellers Rank	#19,103 in Electronics ( See Top 100 in Electronics ) #93 in Audio Component Amplifiers
Brand Name	Fosi Audio
Customer Reviews	4.4 4.4 out of 5 stars (313)
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
Manufacturer	Fosi Audio
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	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

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R5198

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered 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 South Africa.

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