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.

Manufacturer	Fosi Audio
Part number	un pezzo
Item Weight	750 g
Product Dimensions	14.2 x 10.67 x 4.09 cm; 750 g
Item model number	V3 Mono
Colour	Black
Material	[metal]
Voltage	48 Volts
Item Package Quantity	1
Plug profile	Surface Mount
Specification met	CE
Included components	48V Power supply
Batteries included?	No
Batteries Required?	No

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 InputsClimatePartner certified

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