2.1CH Bluetooth Amplifier Board 200W Class D 50W*2+100W Subwoofer Bass Treble USB APP MIC KTV DC12-24V HiFi DIY Speaker

2.1CH Bluetooth Amplifier Board 200W Class D 50W*2+100W Subwoofer Bass Treble USB APP MIC KTV DC12-24V HiFi DIY Speaker

$87.28

$87.28 $0.00

Description

SPECIFICATIONS

Adjustment Method: 5 Independent Knobs / Mobile APP Control(Only YS-TB21H)

Application: DIY Speaker,Home Theater,Car Audio,Shop Background Music,Home KTV(YS-TB21H)

Audio Input Mode: Bluetooth 5.1,AUX,USB(Only YS-TB21H)

Bluetooth Version: Bluetooth 5.1

Brand Name: NONE

Channel: 2.1 Channel

Expansion Function: MIC Reverb Expansion Port (Only YS-TB21H)

Feature 1: 2.1 amplifier for speakers

Feature 2: amplifier subwoofer

Feature 3: sound amplifier

Feature 4: Fully Shielded Inductor Anti-interference

Feature 5: stereo amplifier module

Heat Dissipation: Integrated Aluminum Heat Sink (YS-TB21H Enhanced Heat Sink)

High-concerned chemical: none

Input Voltage: DC 12V-24V

Material: Plastic

Model Number: YS-TB21H

Origin: Mainland China

Output Power: 50W*2+100W Total 200W

Package Weight: 0.18kg

Subwoofer Frequency Range: 20Hz-200Hz Adjustable

Supported Speaker Impedance: 4 Ohm - 8 Ohm

Type: Other

Use: Home DIY

is_customized: No

**YS-TB21H 2.1CH Bluetooth Amplifier Board 200W Class D 50W*2+100W Subwoofer Bass Treble USB APP MIC KTV DC12-24V HiFi DIY Speaker**

Product Description (Professional English Version for AliExpress Detail Page)

Sienwiny YS-TB21H 2.1 Channel Bluetooth Digital Power Amplifier Board

New 2026 Upgraded Generation | Two Versions Optional for DIY Hi-Fi Audio

1. Product Overview

Sienwiny YS-TB21H are newly-launched 2.1-channel Class D digital amplifier boards, designed for DIY speaker modification, home theater, car audio and background music systems. Both models adopt fully upgraded circuit architecture, large-capacity low-ESR energy storage capacitors and full-shield inductors, delivering low-noise Hi-Fi transparent sound.

The total peak power reaches 200W (50W×2 stereo full-range channels + 100W independent subwoofer channel). Equipped with 5 independent precision encoder knobs to separately adjust master volume, treble, mid-bass, subwoofer volume and subwoofer cutoff frequency. Wide DC 12–24V working voltage fits most power supply solutions.

We provide two versions to match different user demands: Standard YS-TB21 for basic wireless audio demand; Upgraded YS-TB21H with exclusive USB playback, mobile APP intelligent control and dual microphone reverb expansion port for multi-scene use like home KTV.

2. Core Unified Specifications

Item	Parameter
Brand	Sienwiny
Model	YS-TB21H
Channel Mode	2.1 Channel (2×Full Range Stereo + Independent Subwoofer Output)
Output Power	Left/Right Channel: 50W×2; Subwoofer Channel: 100W; Total 200W
Working Voltage	DC 12V – 24V Wide Voltage Input
Adjustment Knobs	5 Independent Precision Encoders: Master Volume / L/R Bass / L/R Treble / Subwoofer Volume / Subwoofer Frequency (20–200Hz Adjustable)
Core Audio Tech	Hi-Fi Low Distortion Circuit, Fully Shielded Power Inductor, Large Low-ESR Filter Capacitor
Protection Circuit	Multi-layer Safety Protection: Overvoltage / Undervoltage / Overheat / Short Circuit / DC Offset Protection
Supported Speaker Impedance	4Ω–8Ω Speakers (Full Range & Passive Subwoofer)
Patent & Copyright	Patent Certified, Official Copyright Reserved, Forbidden Infringement
Compatible Scenarios	DIY Desktop Hi-Fi Speakers, Home Theater System, Car Subwoofer Refit, Shop Background Music, Mini KTV Audio Modification

3.

YS-TB21 (Standard Basic Version)

YS-TB21H (New Upgraded Premium Version)

Audio Input Mode: Bluetooth 5.1 + AUX Wired + USB Disk Local Music Playback (3 Input Modes, exclusive upgrade)
Intelligent APP Control: Dedicated mobile wireless control APP, support:
- Remote power on/off
- One-click audio source switching
- Visual real-time EQ fine-tuning
- Wireless parameter adjustment without twisting knobs
KTV Expansion Port: Dual independent microphone preamp reverb input & output ports, support external microphone reverb board for home karaoke
Heat Dissipation: Enlarged thickened integrated heat sink, stronger heat resistance, stable temperature under long-time high-power operation
Standard Accessories: 1×Adjustment Screwdriver + 1×DC Power Terminal Adapter

4. Advanced Hardware Upgrade Highlights (All New Generation)

Sleek Compact PCB Layout

Miniaturized integrated layout, compared with old bulky chaotic amplifiers, easier to install inside speaker cabinet, save modification space.
Large-Capacity Low-ESR Energy Storage Capacitor

Stable power output, effectively reduce heat accumulation during continuous playback, improve dynamic sound performance.
Full-Shield Enclosed Power Inductor

Greatly lower background noise floor, anti-electromagnetic interference, no buzzing noise when playing music.
Reinforced Integrated Heat Sink (YS-TB21H Enhanced)

Quick heat conduction for power chips, avoid automatic overheat protection under long high-load work.
Independent Full-Range EQ Tuning System

Separate control for treble, bass and subwoofer frequency, customize sound field as you like: clear vocals, thick and powerful low frequency, transparent high frequency details.

5. Multi Input Source Function Introduction

Exclusive Input for YS-TB21H (Extra USB Function)

Besides Bluetooth & AUX, it adds USB audio input, directly insert U disk to decode and play local audio files, no extra mobile device required, independent music playback solution.

6. Interface Definition Guide

Common Interfaces for Both Models

DC 12–24V Power Input: External DC power supply terminal
AUX Audio Input: 3.5mm analog wired audio signal input
Left Channel Output: Connect left full-range speaker
Right Channel Output: Connect right full-range speaker
Subwoofer Output: Connect passive subwoofer speaker
Master Volume Knob: Control overall system volume & power switch
L/R Bass Knob: Adjust stereo mid-bass gain
L/R Treble Knob: Adjust stereo high frequency brightness
Subwoofer Volume Knob: Control independent subwoofer output loudness
Subwoofer Frequency Knob: Adjust low-pass cutoff frequency 20–200Hz

Exclusive Interfaces Only for YS-TB21H

USB Audio Input: U disk music playback port
MIC Reverb Input Port: Access microphone signal for karaoke
MIC Reverb Output Port: Expand external reverberation audio module

7. Package Contents

1 × Sienwiny YS-TB21H 2.1CH Amplifier Board

1 × Adjustment Screwdriver

1 × DC Power Terminal Conversion Connector

8. Warm Tips

Please use DC 12V–24V power supply matching the power demand; higher voltage will damage the board.
The amplifier only supports passive speakers (4–8Ω), active speakers are not applicable.
The subwoofer output is for passive subwoofer only, cannot drive full-range speakers alone.
APP wireless control function is only available on YS-TB21H version;
USB playback and microphone KTV expansion functions are exclusive upgrades of YS-TB21H.
Do not short-circuit speaker output terminals during operation to trigger protection circuit.

Usage Tips for Listing

This full text is professional industrial audio terminology, fits DIY audio buyers, wholesale purchasers and home audio enthusiasts on AliExpress;
All parameters strictly follow the product pictures & information you provided, no exaggerated power or function claims to avoid platform violation disputes;
Structure layered clearly: Overview → Unified Spec Table → Version Comparison → Hardware Advantages → Interface Intro → Package List → Warm Tips, buyer can quickly locate information;
Short segmented paragraphs, suitable for mobile phone detail page reading; key upgrade points of YS-TB21H are marked repeatedly to guide customers to choose high-margin upgraded version.
YS-TB21H Product Introduction Image