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

Product ID: 641505874

Details

Item dimensions L x W x H
5.71 x 4.24 x
Manufacturer
Fosi Audio
Maximum Supply Voltage
48
Minimum Supply Voltage
48
Voltage
230 volts

⚡240W peak power output

🌀PFFB tech for ultra-low distortion

❄️Full-body heat dissipation design

€ 336.68

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Description

🎧 Elevate your home audio game — power, precision, and pristine sound in one sleek amp!

COOL UNDER PRESSURE - Advanced full-body heat dissipation and dual side vents keep your amp running stable during marathon listening sessions.
PREMIUM COMPONENTRY - Built with TPA3255 chip plus Japanese Nichicon & ELNA capacitors and German WIMA for pristine audio purity.
POWERHOUSE PRECISION - Delivers a robust 240W @4Ω to drive your high-end speakers with crystal-clear authority.
NEXT GEN SOUND CLARITY - Innovative PFFB feedback tech crushes distortion and elevates frequency response for audiophile-grade fidelity.
FLEXIBLE CONNECTIVITY CUSTOMIZATION - Supports balanced XLR/TRS and RCA inputs with gain toggle, plus swappable op-amps for your signature sound.

The Fosi Audio V3 Mono Power Amplifier is a compact Class D monoblock delivering 240W at 4Ω, engineered with cutting-edge PFFB technology to minimize distortion and maximize sound fidelity. Featuring premium components like the TPA3255 chip and high-grade capacitors, it ensures audiophile-level performance. Its innovative full-body heat dissipation design and dual ventilation maintain stable output during extended use. With versatile RCA and balanced XLR/TRS inputs plus customizable op-amps, it’s the perfect powerhouse for building or upgrading your HiFi home theater or multi-channel audio system.

Specifications

ASIN	B0D31M3DXY
Best Sellers Rank	#26,116 in Electronics ( See Top 100 in Electronics ) #119 in Audio Component Amplifiers
Brand Name	Fosi Audio
Customer Reviews	4.2 4.2 out of 5 stars (331)
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 g
Manufacturer	Fosi Audio
Material Type	[metal]
Maximum Output Power	240 watts
Maximum Supply Voltage	48 volts_of_direct_current
Minimum Supply Voltage	48 volts_of_direct_current
Model	V3 Mono
Mounting Type	Surface Mount
Number of Channels	1
Number of Items	1
Output Power	240 watts
Part Number	un pezzo
Specification Met	CE
Supply Current	1.04 A
Voltage	230 volts
Warranty Description	24-month manufacturer

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€ 336.68

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered 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 Greece.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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