TPA3116 2.1 50Wx2+100W Bluetooth CSR4.0 Class D Power Amplifier

The TPA3116 is a high-performance Class D integrated audio amplifier module delivering 50W per channel on stereo channels plus 100W on the subwoofer channel, engineered for professional audio applications requiring compact form factor with wireless connectivity. Audio engineers, DIY enthusiasts, and commercial sound system integrators rely on this amplifier to deliver crystal-clear, high-fidelity sound with minimal thermal footprint and exceptional power efficiency. This amplifier solves the critical challenge of integrating wireless Bluetooth connectivity with high-power audio amplification while maintaining low distortion and superior audio quality in space-constrained installations.

Product Overview

The TPA3116 Class D power amplifier utilizes advanced pulse-width modulation technology to achieve exceptional power efficiency, converting up to 90% of input electrical power into acoustic output while minimizing heat generation. The integrated CSR4.0 Bluetooth module enables seamless wireless audio streaming from smartphones, tablets, and computers within a 10-meter range, supporting A2DP and AVRCP profiles for superior codec compatibility. The 2.1 channel configuration with dedicated subwoofer amplification allows for independent bass management, enabling users to optimize low-frequency response separately from midrange and treble frequencies, making this module ideal for powered speaker systems, home theater applications, and portable audio solutions.

This amplifier features integrated protection circuitry including thermal shutdown, DC offset detection, and short-circuit protection, ensuring reliable operation even in demanding continuous-use scenarios. The low-noise design with signal-to-noise ratio exceeding 100dB ensures clean amplification of weak input signals without introducing audible hum or interference. Built-in input filtering and impedance matching circuits provide flexibility for integration with various audio sources, while the compact PCB design facilitates easy integration into existing speaker enclosures or amplifier chassis without requiring extensive redesign.

Key Specifications

Specification	Details
Product Type	Class D Integrated Audio Power Amplifier Module with Bluetooth
Brand	TPA3116 Series
Origin	Original/Authentic
Warranty	7 days on manufacturing defects
Shipping	1-5 days from Bengaluru
Delivery	7-8 days across India
Support	24/7 via Email and WhatsApp
Output Power	50W x 2 (Stereo Channels) + 100W (Subwoofer Channel) at 4 Ohms
Bluetooth Standard	CSR4.0 with A2DP and AVRCP Support
Frequency Response	20Hz to 20kHz (±3dB)
Total Harmonic Distortion	Less than 0.1% at rated power
Signal-to-Noise Ratio	Greater than 100dB
Input Impedance	10kOhms (RCA), 100kOhms (Bluetooth)
Power Supply	24V DC, 5A (120W minimum recommended)
Operating Temperature Range	-10°C to +50°C
PCB Dimensions	Compact form factor for easy integration

Key Features

• Dual 50W Stereo Amplification with 100W Subwoofer Channel enabling independent bass management and superior frequency separation for enhanced audio clarity across the full spectrum
• CSR4.0 Bluetooth Wireless Connectivity with advanced codec support allowing lag-free audio streaming from mobile devices, tablets, and computers up to 10 meters distance
• Class D Topology delivering 90% power efficiency and minimal heat dissipation, eliminating the need for large heatsinks and enabling compact installation in space-constrained applications
• Integrated Protection Circuitry including thermal shutdown, DC offset detection, and short-circuit protection safeguarding against equipment damage and ensuring long-term reliability
• Low Noise Design with 100dB+ SNR providing clean amplification without audible hum, interference, or background noise even at maximum volume levels
• Flexible Input Options supporting both analog RCA inputs and wireless Bluetooth connectivity, allowing seamless integration with diverse audio source equipment

Applications and Use Cases

• Powered Speaker Systems and Active Monitor Speakers where integrated amplification eliminates the need for separate external amplifiers while delivering professional-grade audio quality for studio monitoring and live performance applications
• Portable Bluetooth Speaker Design enabling manufacturers to create compact, battery-powered wireless speakers with substantial power output and superior audio fidelity for consumer electronics and outdoor entertainment
• Home Theater Subwoofer Integration providing dedicated low-frequency amplification for subwoofer drivers in surround sound systems, delivering impactful bass response for immersive home cinema experiences
• DIY Audio Projects and Custom Sound Systems allowing electronics enthusiasts and audio engineers to build professional-quality amplified speaker systems with minimal component count and design complexity
• Commercial Installation Applications in restaurants, retail environments, and small venues where wireless Bluetooth connectivity combined with reliable amplification provides flexible audio distribution without complex wiring infrastructure

How to Use

Begin setup by connecting a suitable 24V DC power supply rated for minimum 5A continuous current to the dedicated power input terminals on the TPA3116 module, ensuring proper polarity to avoid component damage. Connect your audio source either via the RCA analog inputs for wired connection or activate Bluetooth pairing mode by pressing the dedicated pairing button to discover the module on your smartphone or audio device. For stereo speaker systems, connect the left and right channel amplifier outputs to corresponding speaker drivers rated at 4 to 8 ohms impedance, and connect the subwoofer output to your subwoofer driver with appropriate impedance matching. Adjust the volume control potentiometers on the module to set appropriate output levels, typically starting at minimum and gradually increasing while monitoring for distortion or clipping indicators.

For optimal performance, maintain adequate ventilation around the amplifier module to allow passive heat dissipation, and avoid blocking the PCB vents or surrounding the unit with insulating materials that could restrict airflow. When using Bluetooth connectivity, ensure your audio source device is within 10 meters of the amplifier and maintain line-of-sight orientation to minimize signal dropouts. For permanent installations, secure the module to a mounting surface using non-conductive spacers to prevent accidental short circuits, and route power and signal cables separately to minimize electromagnetic interference. Regularly inspect solder joints and connector contacts for corrosion or oxidation, particularly in high-humidity environments, and clean contacts with isopropyl alcohol as needed to maintain reliable electrical connections.

Frequently Asked Questions

What is the difference between Class D and traditional Class AB amplifier designs?

Class D amplifiers use pulse-width modulation to switch high-current output transistors on and off at ultrasonic frequencies, achieving power efficiency exceeding 90% compared to Class AB designs which typically achieve 50-70% efficiency. This results in significantly lower heat generation, allowing the TPA3116 to operate without large heatsinks while delivering comparable power output. Class D amplifiers introduce minimal harmonic distortion when properly filtered, making them ideal for high-fidelity audio applications where efficiency and compact form factor are critical design requirements.

Can I use the TPA3116 with speakers rated at different impedance values?

The TPA3116 is optimized for 4-ohm speaker loads, delivering rated power of 50W per stereo channel at this impedance. While the amplifier can technically drive 8-ohm speakers, output power will decrease to approximately 25-30W per channel due to reduced current delivery at higher impedance. For subwoofer applications, ensure your driver impedance matches the amplifier specifications to prevent clipping or thermal stress. Never connect speakers with impedance below 4 ohms, as this will exceed maximum current ratings and trigger protection circuits or cause permanent damage to output transistors.

How do I optimize bass response when using the subwoofer channel?

The TPA3116's dedicated 100W subwoofer channel allows independent frequency management through external crossover circuits or digital signal processing in your audio source. Implement a low-pass filter at 80-120Hz to isolate bass frequencies to the subwoofer while routing midrange and treble to the stereo channels, creating seamless integration between drivers. Adjust subwoofer output level using the dedicated volume control potentiometer, starting at minimum and gradually increasing while monitoring for room resonances or standing waves. Position the subwoofer strategically in your listening space, typically in a corner or along a wall, to maximize bass coupling and minimize localization of low-frequency sources.

What Bluetooth codecs does the CSR4.0 module support?

The CSR4.0 Bluetooth module supports the A2DP profile with SBC codec as standard, providing compatibility with all Bluetooth audio devices. Advanced codec support may include aptX and AAC depending on the specific module implementation, though SBC codec ensures universal compatibility across all smartphones, tablets, and computers with Bluetooth audio capabilities. Connection range typically extends to 10 meters in open space with clear line-of-sight, though range may decrease in environments with significant RF interference or physical obstructions.

When will I receive my order?

Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.

What is your return and warranty policy?

We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.

Are bulk discounts available?

Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.

Why Buy from The Engineer Store

• Genuine Products: Sourced directly from authorized distributors with authentication
• Expert Team: Our technical team validates every product before listing
• Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
• Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata
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• Technical Support: 24/7 expert guidance via email and WhatsApp
• Returns: 7-day return policy on manufacturing defects only

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