DC12-24V TPA3116D2 2.1 Channel Digital Subwoofer Power Amplifier Board

Specifications

• Amplifier Chip: 2 x TPA3116D2
• Channel Configuration: 2.1 Channels (Left, Right, Subwoofer)
• Operating Voltage: DC 12V to 24V (24V recommended for max power)
• Maximum Power Output: 50W (Left) + 50W (Right) + 100W (Subwoofer)
• Speaker Impedance: 4 Ohms to 8 Ohms
• Audio Input Options: 3.5mm AUX Jack or 3-Pin Audio Connector (Board-level)
• Onboard Controls: 3 x Rotary Potentiometers (Master Volume, Subwoofer Volume, Subwoofer Frequency)
• Frequency Response Range: 14-100KHz
• Dimensions: Approx. 100.4mm x 70mm x 27.1mm
• Protection Features: Over-voltage, under-voltage, over-heat, short-circuit protection

Applications

• Custom Bluetooth Boomboxes: Build high-powered, portable party speakers.
  Desktop 2.1 Audio Systems: Upgrade your PC sound with a custom-built 2.1 enclosure.
• Arcade Cabinet Restorations: Provide booming, authentic sound to retro arcade builds.
• Car Audio Upgrades: Easily runs off a 12V car battery to add a dedicated subwoofer channel to your vehicle.

Features

• Adopts two high-quality TPA3116D2 digital amplifier chips.
• Good sound quality, highly efficient device, and has power power-amplifying feature.
• 50W x 2,100Wx1  3 channels(left/right channel and subwoofer channel)
• Built-in heat sink to prevent overheating and maintain the amplifier's performance.
• Powered by DC 12-24V, wide input voltage.
• Users can adjust the volume by themselves easily.
• Applicable speaker impedance: 4-8 ohm.

Package Includes:

• 1 x DC12-24V TPA3116D2 3-Channel Digital Subwoofer Power Amplifier Board

Frequently Asked Questions (FAQ)

• What power supply do I need for the maximum 200W output?
  To achieve the full 50W+50W+100W output, you must use a 24V power supply rated for at least 8 to 10 Amps.
• Can I use a standard 12V 2A power adapter?
  Yes, the board will turn on and play music, but the maximum wattage will be severely limited. Pushing the volume high on a 2A supply will cause audio clipping and board restarts.
• Why is my amplifier cutting out when the bass hits?
  This is a classic sign of an underpowered power supply. When the subwoofer demands a sudden surge of current for a bass note, a weak power supply's voltage drops, triggering the board's under-voltage protection to reboot it.
• Does this board have built-in Bluetooth?
  No, this specific version requires an external analog audio source via the 3.5mm AUX or the 3-pin input header.
• What speaker impedance is supported?
  You can use speakers rated between 4 Ohms and 8 Ohms.
• How do I connect a Bluetooth module to this board?
  You can wire the Audio Out (L, R, GND) of a standard 5V Bluetooth receiver module directly to the 3-pin input header on this amplifier board.
• Why is there a static hiss when no music is playing?
  This is typically caused by unshielded audio cables, a dirty power supply, or a ground loop (especially if you are powering a Bluetooth module from the same power source as the amplifier).
• What is the frequency range of the subwoofer output?
  The right-most knob controls the low-pass filter crossover, typically adjustable between 20Hz and 200Hz, allowing only low frequencies to reach the subwoofer terminal.
• Are the potentiometers and knobs included?
  Yes, the three volume potentiometers are pre-soldered, and the decorative knobs are included in the package.
• Can I bridge the left and right channels for a single 100W speaker?
  No. The TPA3116D2 chips on this board are already internally bridged (BTL mode) to achieve 50W per channel and 100W for the sub. You cannot bridge them further.
• Does the board get hot during operation?
  The included heatsink easily handles normal thermal loads due to Class-D efficiency. However, if running at max 24V/200W continuously, ensure your speaker enclosure has passive ventilation.
• Can I run this directly off a 12V car battery?
  Yes, a 12V lead-acid or AGM car battery provides excellent, high-current, clean power for this board.
• What gauge wire should I use for the speakers?
  We recommend using 16 AWG to 14 AWG pure copper wire, especially for the 100W subwoofer run, to prevent power loss.