Square Audio High-power Portable Subwoofer 40W with Lithium Battery for Outdoor Use

This portable subwoofer delivers 40 watts of power from a compact, battery-driven unit that eliminates the need for a mains socket. Designed for desktop listening, fitness sessions, outdoor gatherings, home karaoke, and square dance events, it offers practical audio backup wherever you go. The integrated card slot, recording feature, and voice prompt function add versatility for public announcements or money collection. With two size options and a robust frequency range of 100Hz–20kHz, it provides solid bass and clear voice reproduction suitable for both music and speech.

Features and Construction

The subwoofer is built around a 40W rated power amplifier and a lithium battery that allows cordless operation. Two distinct models cater to different sound output needs: a 4-inch driver or a larger 6.5-inch driver. The rated voltage is 5V, making it compatible with standard USB charging adaptors.

Speaker Size and Battery

The Shanshui E50 features a 4-inch speaker and runs on a standard 4-section 18650 lithium battery. It is supplied without a microphone. The Shanshui E51 uses a 6.5-inch speaker and includes a standard 6-section 18650 battery, plus a single microphone for karaoke or announcements.

Audio Performance and Controls

With a frequency response of 100Hz–20kHz, the subwoofer covers both low-end bass and high-frequency detail. Controls include basic playback adjustments, a card insertion slot for microSD or USB media, recording activation, and a voice prompt system. The money collection broadcast function is particularly useful for events where cash handling occurs.

Uses and Placement

This speaker is intended for scenarios where mains power is inconvenient or unavailable. Its portable design suits a variety of settings from indoor desktops to outdoor dance floors.

Event or Professional Use

For square dance sessions, outdoor fitness classes, or karaoke nights, the 40W output provides room-filling sound. The voice prompt and recording functions support announcements, instructions, or money collection during community events.

Everyday Home Use

Place it on a desktop for casual music listening, or take it to the garden for background audio. The lithium battery offers several hours of playback depending on volume, and the card slot means you can play pre-loaded playlists without a phone connection.

Benefits and Buying Value

This subwoofer reduces the need for multiple devices by combining speaker, media player, and recorder in one unit. Its battery operation increases flexibility for both planned and spontaneous use.

Reuse and Low Maintenance

The 18650 lithium battery is rechargeable and replaceable, extending the product’s service life. With no complex wiring or fixed installation, it can be moved between rooms or taken outdoors without effort.

Why Choose This Product

If you need a portable audio solution with enough power for group activities, the choice between a 4-inch or 6.5-inch driver lets you match bass output to your space. The built-in recording and voice prompt features are uncommon in this price and size category, making it especially suited for community organisers, fitness instructors, and home karaoke enthusiasts.