Car MP3 Player Amplifier with USB/SD and FM Radio – 20W x 2 Stereo Receiver HY-400

This compact car MP3 power amplifier is a practical upgrade for any vehicle sound system. It plays MP3 music directly from a USB stick or SD/MMC card and includes a full FM stereo radio tuner. With four DSP sound field patterns, minimal harmonic distortion of 0.05%, and an 85dB signal-to-noise ratio, the unit delivers clear, powerful audio from a tiny 15.5cm by 8.5cm by 4cm chassis. Whether you need a simple plug-and-play audio source or a flexible amplifier for your car's existing speakers, this model combines convenience and sound quality without taking up dashboard space.

Features and Construction

The HY-400 is built around a high-power four-channel professional amplifier integrated circuit designed to minimise distortion while providing strong output. The front panel includes slots for USB and SD/MMC media, a small LCD display, and controls for volume, source, and track selection.

Audio Performance

Frequency response spans 20Hz to 20KHz with total harmonic distortion rated at 0.05% or less at 4W and 1KHz. The signal-to-noise ratio of 85dB helps keep background noise low. Bass and treble controls give 12dB of adjustment each, and the signal input level is 220mV at 47K ohms.

Power and Output Channels

The amplifier delivers 20W per channel across two main and two surround channels, powered by a standard DC 12V car supply. This is sufficient for most aftermarket or factory speaker setups, providing clear sound for music or FM radio.

DSP Sound Field Modes

Four DSP sound field patterns let you tailor the audio to different music genres or listening environments, enhancing the listening experience without needing a separate equaliser.

Uses and Placement

This amplifier is designed for in-car use, connecting directly to a 12V electrical system. Its compact size means it fits into tight spaces such as under the dashboard or inside a glovebox.

In-Car Music Playback

Use a USB stick or SD card full of MP3 files for direct playback without phone pairing or streaming. The FM radio adds extra listening options for news or traffic updates.

Stereo Upgrade

If your car lacks an auxiliary input or Bluetooth, this unit provides a straightfoward wired audio solution with four channels of amplified output. It works with most 4-ohm speaker systems commonly found in vehicles.

Benefits and Buying Value

The HY-400 offers multiple audio sources in one box, reducing the need for separate devices. The remote control, powered by a CR2025 battery, allows safe operation while driving.

Compact and Portable

Weighing only 0.25kg and measuring 15.5cm x 8.5cm x 4cm, the amplifier is easy to install or move between vehicles. The wired USB connection is reliable and doesn't drain a phone battery.

Why Choose This Product

For a straightforward car audio upgrade with USB/SD playback, FM radio, and four-channel amplification, the HY-400 covers the essentials without complex wiring or expensive equipment. The DSP modes are a useful extra for tailoring sound to your taste.