ZK-ST21 100W+100W+200W 2.1CH Bluetooth Digital Power Subwoofer Amplifier Board

Short Description

The ZK-ST21 is a 2.1-channel Bluetooth digital power amplifier board designed for DIY audio projects and custom speaker systems. With a stated power configuration of 100W + 100W for stereo speakers and 200W for the subwoofer channel, it is suitable for building a compact 2.1-channel audio amplifier system.

Product Overview

The ZK-ST21 2.1CH Bluetooth Digital Power Subwoofer Amplifier Board combines stereo speaker amplification and a dedicated subwoofer channel in one board. Its integrated Bluetooth functionality allows compatible devices to stream music wirelessly, making it a practical choice for DIY home audio systems, custom multimedia speakers, and personal audio projects.

With separate left, right, and subwoofer channels, this board is designed for users who want stereo sound alongside dedicated bass output without building three separate amplifier sections.

Available at Voltech Electronics, the ZK-ST21 is suitable for electronics enthusiasts, audio hobbyists, and DIY builders looking to create a custom 2.1-channel sound system.

Main Features

1. 2.1-Channel Audio Configuration

The board is designed to operate with:

Left channel: stated 100W output
Right channel: stated 100W output
Subwoofer channel: stated 200W output

This configuration supports a stereo speaker pair and a dedicated subwoofer. Actual output power depends on the power supply, speaker impedance, cooling, and operating conditions.

1. Bluetooth Music Streaming

The integrated Bluetooth feature allows wireless audio playback from compatible devices, such as smartphones, tablets, and computers.

Bluetooth version, supported audio codecs, and wireless range should be confirmed from the manufacturer's specifications.

1. Digital Power Amplifier

The ZK-ST21 uses a digital power amplification design intended for compact audio system construction. Its integrated multi-channel configuration helps simplify the assembly of a DIY 2.1-channel amplifier.

1. Dedicated Subwoofer Channel

The dedicated subwoofer output allows a compatible passive subwoofer to be integrated with the left and right stereo speakers, creating a 2.1-channel sound system with separate bass output.

The final bass performance depends on the subwoofer driver, enclosure design, power supply, and amplifier settings.

1. Suitable for DIY Audio Projects

The board can be considered for custom speaker builds and amplifier projects where Bluetooth playback and separate stereo and subwoofer outputs are required.

Applications
DIY 2.1-channel home audio systems
Custom multimedia speaker systems
Bluetooth speaker projects
Desktop audio systems
DIY subwoofer amplifier projects
Custom wooden or metal speaker enclosures
Electronics and audio experimentation
Technical Specifications
Specification Details
Product Name ZK-ST21 Bluetooth Digital Power Amplifier Board
Model ZK-ST21
Amplifier Type Digital Power Amplifier
Audio Channels 2.1 Channel
Left Channel Power 100W stated
Right Channel Power 100W stated
Subwoofer Channel Power 200W stated
Total Advertised Power 400W (100W + 100W + 200W)
Bluetooth Supported
Speaker Configuration Left + Right + Subwoofer
Product Type Amplifier Board
Applications DIY Audio, Home Audio, Custom 2.1CH Speaker Systems

Power rating note: The advertised 100W + 100W + 200W figures should not automatically be interpreted as continuous RMS output. Actual output depends on the manufacturer's rating conditions, supply voltage, speaker impedance, distortion level, and cooling.

Installation and Usage Notes
Use a compatible DC power supply that meets the board manufacturer's voltage and current requirements.
Match the connected speakers and subwoofer to the amplifier's supported impedance.
Check the board's power input polarity before connecting the power supply.
Provide suitable ventilation and cooling during operation.
Use appropriate wiring and avoid short circuits at the speaker terminals.
Confirm the supported power supply and speaker specifications before installation.

The required power supply voltage, maximum current, supported speaker impedance, and exact output ratings should be verified against the manufacturer's documentation before use.

Package Includes
1 × ZK-ST21 2.1CH Bluetooth Digital Power Subwoofer Amplifier Board

Power supply, speakers, subwoofer, enclosure, and other accessories are not included unless specifically stated in the product package.

Important Notes
This is an amplifier board, not a complete speaker system.
A compatible external power supply is required.
Actual output power may differ from the advertised ratings.
Bluetooth specifications and supported input options should be confirmed before purchase.
Check the board dimensions and terminal layout before designing an enclosure.