TPA3116D2 2.1 Amplifier – 100W of pure bass and crystal-clear stereo in a compact module
Looking for powerful sound, punchy bass, and distortion-free stereo without the premium price tag of a commercial amplifier? This 2.1 channel amplifier module featuring the TPA3116D2 chip delivers exactly that. With dual Texas Instruments chips, a dedicated subwoofer architecture, and a high-performance NE5532 preamplifier, you get professional-grade audio on a compact 10×9 cm PCB, ready for your next project.
Note: Maximum power output is achieved at 24V DC with 4-ohm speakers. At 12V or 8 ohms, the effective power will be proportionally lower. A stabilized power supply of at least 3A is recommended.
Why choose this model? (Key Advantages):
- Dual TPA3116D2 chips — One dedicated to stereo L/R channels and the other operating exclusively in Bridge-Tied Load (BTL) mode for the subwoofer, ensuring zero signal interference between channels.
- 100W dedicated subwoofer output — A true bridge configuration that delivers physical, room-shaking bass rather than just background noise.
- NE5532 Preamplifier — A low-noise dual op-amp commonly found in professional audio gear, allowing you to fine-tune bass, mid-range, and treble directly on the board.
- 100dB SNR and 1.2MHz switching frequency — Switching artifacts are kept well above the audible spectrum, ensuring clean, crisp sound reproduction.
- Dual selectable audio inputs — Connect your phone and PC simultaneously and switch between them effortlessly without unplugging cables.
- 12–24V DC power range — Highly versatile; works with 12V car batteries, standard power adapters, or Li-Ion packs.
- Compact 10×9×2.5 cm footprint — Easily fits into custom DIY enclosures, active speakers, or car audio builds without requiring a complete redesign.
Performance and Architecture
The 2.1 architecture is implemented with precision: the first TPA3116D2 manages standard stereo channels, while the second operates in BTL (Bridge-Tied Load) mode. This doubles the voltage to the subwoofer, delivering up to 100W of continuous power without needing a separate power supply.
The NE5532 tone control stage is more than just a passive filter; it is an active preamplifier with a frequency response of 14Hz to 100kHz, preserving high-frequency detail while letting the bass breathe. Total harmonic distortion remains extremely low even at high volumes, ensuring the sound remains fatigue-free during long listening sessions.
| Parameter | Value / Detail |
|---|---|
| Amplification Type | Class D (Digital) |
| Amplifier Chips | 2 × TPA3116D2 (Texas Instruments) |
| Preamplifier / Tone | NE5532 (low-noise dual op-amp) |
| Channel Configuration | 2.1 – Stereo (L/R) + Dedicated Subwoofer |
| Stereo Output Power | 2 × 50W |
| Subwoofer Output Power | 100W (BTL mode) |
| Speaker Impedance | 4 – 8 Ohms |
| Power Supply | 12V – 24V DC, minimum 3A |
| Frequency Response | 14Hz – 100kHz |
| SNR (Signal-to-Noise Ratio) | 100dB |
| Switching Frequency | 1.2MHz |
| Audio Inputs | 2 selectable inputs (jacks or terminals) |
| Volume Control | On-board potentiometers |
| Module Dimensions | 10 × 9 × 2.5 cm |
Usage Instructions
- Power Supply: Connect a stabilized DC source between 12V and 24V (minimum 3A), observing the polarity marked on the PCB (+ and –). For maximum output, use 24V / 5A.
- Speaker Connections: Connect stereo speakers (4–8Ω) to the L+/L– and R+/R– terminals. Connect the subwoofer (4–8Ω, minimum 80W RMS) to the SUB terminals.
- Input Selection: Connect your audio sources to the inputs and use the on-board switch or jumper to select the active channel.
- Volume and Tone Adjustment: Start at minimum volume and increase gradually. Adjust the master volume, subwoofer level, bass, and treble knobs to your preference.
- Ventilation: Ensure adequate airflow around the module. For 24V operation or extended high-volume use, we recommend attaching a small heatsink to the TPA3116D2 chips to ensure longevity.
Package Contents
- 1 × TPA3116D2 2.1 Amplifier Module (Fully assembled PCB)
Frequently Asked Questions
Which speakers are compatible with this module?
Any speaker with an impedance between 4 and 8 Ohms. For the subwoofer, ensure you use a woofer capable of handling at least 80–100W RMS; a 50W speaker may be overdriven at high volumes.
What power supply do I need?
A stabilized DC power supply between 12V and 24V, minimum 3A. For maximum power, use 24V / 5A. It is also compatible with 12V car batteries, making it ideal for DIY automotive audio projects.
Is a heatsink required?
At 12V and moderate volume, it is not strictly necessary. However, for 24V operation or long sessions at high volume, adding a small heatsink to the TPA3116D2 chips will significantly extend the life of the module.
Can I use both audio inputs at the same time?
Not simultaneously. The module features an input selection system. You can connect two sources (e.g., phone and laptop) and switch between them without needing to unplug any cables.
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