The CA-TB21 (also known as ZK-TB21) 2.1 Channel Bluetooth Subwoofer Amplifier Board is a versatile and compact Hi-Fi audio solution. At Electrapac, we recommend this board for users who want to create a powerful 2.1 home theater system or upgrade old speakers with modern Bluetooth 5.0 connectivity and deep bass control.

Product Overview

This module utilizes the Dual TPA3116D2 high-performance Class-D amplifier chips. It delivers a total of 200W of power, split between two stereo channels for crisp highs and a dedicated third channel for a powerful subwoofer.

Key Features for Electrapac Customers

• Independent Tone Control: The board features five dedicated knobs for total sound customization:

  • Subwoofer Frequency: Adjust the bass crossover point (20Hz–200Hz).

  • Subwoofer Volume: Control the intensity of the low-end.

  • L/R Treble & Bass: Independent EQ for the main stereo speakers.

  • Master Volume: Main control with an integrated power switch.

• Premium TPA3116D2 Chips: These chips are famous in the DIY community for their high efficiency and low distortion (<0.1%), ensuring your music stays clear even at high volumes.

• High-Quality Connectivity: Uses heavy-duty copper DC connectors and barrier terminals that can handle high currents without overheating.

• Full Protection Suite: Includes protection against overvoltage, undervoltage, overheating, DC detection, and short circuits to safeguard your speakers and the board.

• Easy Assembly: Most versions from www.electrapac.com come as a kit including a protective top and bottom plate, knobs, and a screwdriver for quick setup.

Setup & Power Tips

1. Power Supply Selection: For the best performance, use a 24V 5A power adapter.

   • Using a 12V supply is safe but will limit your total output to about 1/4 of the maximum power.

2. Audio Mode Priority: Bluetooth is the default mode. To use the AUX input, you must disconnect the Bluetooth pairing from your phone first.

3. Speaker Pairing:

   • Stereo Channels: Use full-range or mid-high frequency speakers.

   • Subwoofer Channel: Must be connected to a dedicated subwoofer speaker (not a standard full-range speaker) for optimal bass.

Why Shop at Electrapac?

We ensure our CA-TB21 boards feature original chips for the best "Hi-Quality" audio experience. Visit www.electrapac.com to find this board along with matching power supplies and speakers for your next project.