A3 Audio Amplifier, USB/SD/FM/AUX, 2-Channel

Description

A3 USB/SD/FM/AUX 2ch Audio Amplifier Multifunctional A3 stereo amplifier — a compact and versatile solution for home, cafes, offices, and small audio setups. It supports multiple input formats (USB, SD cards, radio, FM, AUX), plays audio directly, and amplifies the signal to two channels for connecting speakers.

Specifications

Parameter — Value/description

Format — Stereo amplifier, 2 channels (Left + Right)

Supported inputs — USB, SD/microSD slot, AUX/Line-in, FM radio

Playback formats — MP3 / WAV / (and others — to be confirmed)

Output power — (specify rated power per channel, e.g. 2×50 W or other)

Frequency range — (e.g. 20 Hz – 20 kHz

to be confirmed for the model)

Signal-to-noise ratio — (specify if known)

Harmonic distortion (THD) — (if data available)

Power supply voltage — AC 220 V/DC (if external power is supported)

Housing material — Metal / aluminum / plastic

Dimensions/weight — (specify if known)

Functions and features

Media inputs — connect USB flash drives and SD/TF cards with audio files

FM radio — built-in receiver for listening to radio stations

AUX/Line-in — connect external audio sources (phone, tablet, laptop, etc.)

Volume control, channel balance

Signal stability — overheating and overload protection (if provided)

Easy installation — compact dimensions, mounting holes (if present)

High-quality amplification — clean sound without distortion (when operating within the stated power range)

Advantages

Versatile device — replaces several components at once

Easy to use — mode switching, input selector

An excellent solution for sound in small rooms

Convenient connections — supports USB / SD / AUX

Built-in FM radio as an extra feature

What's included

• A3 USB/SD/FM/AUX 2ch amplifier
• Power cable / adapter (if an external power source is provided)
• User manual