B2 Audio RIOT-2.5 Mini Woofer 3D-Printed Box, Amp & Enclosure DIY Project

• POWERFUL MINI WOOFER PERFORMANCE: The 2.5" B2 Audio RIOT-2.5 loudspeaker delivers 20W RMS / 40W Max with clean mid-bass and crisp highs, featuring a durable aluminum basket and paper cone for pro-grade sound in a small format.
• BLUETOOTH 5.0 + AUX CONNECTIVITY: Stream wirelessly or connect directly—this 100W+100W 2-channel Class-D amplifier features Bluetooth 5.0 and AUX inputs with treble/bass controls for precise audio tuning.
• Tinkerers: Perfect for tech tinkerers and builders exploring high-performance mini audio systems. Experiment with Bluetooth amps, subwoofers, and 3D-printed enclosures to create custom sound solutions that push the limits of compact design.
• DIY Enthusiasts: Ideal for DIY audio enthusiasts who love hands-on projects. Build your own Bluetooth speaker or mini subwoofer setup and experience the thrill of real-world sound design with B2 Audio’s precision-engineered components.
• Educators: A great choice for educators and STEM programs teaching real-world sound engineering. Engage students with a practical Bluetooth amplifier and subwoofer system that combines 3D printing, electronics, and acoustics for immersive learning.

B2 Audio RIOT-2.5 Mini Woofer 3D-Printed Box, Amp & Enclosure DIY Project

This Listing Includes:

• (1) B2 Audio RIOT-2.5 Mini Woofer 2.5" 4 Ohm Loudspeakers 20W RMS Aluminum Basket


• (1) Single Ported 3D-Printed Subwoofer Enclosure for B2 Audio RIOT-2.5


• (1) Daakro ZK-1002T Amplifier: 100W+100W 2.0 Channel Bluetooth 5.0 + AUX Input, Treble/Bass Control, DC 12–24V


• (1) Custom 3D-Printed B2 Audio Amp Box for ZK-1002T Amplifier

This kit brings together everything you need to build a small Bluetooth-powered speaker project using the B2 Audio RIOT 2.5.

The RIOT 2.5 is a 2.5" speaker with a subwoofer-inspired design, making it a popular choice for hobbyists building desktop audio systems, demo boxes, and creative DIY setups. It offers more output and presence than the smaller RC2 platform while still keeping the build compact.

The included 3D printed enclosure and amplifier case provide a clean foundation for your project, while the ZK-1002T Bluetooth amplifier powers the system.

Just add a compatible 12–24V DC power supply and complete the wiring.

Specifications:

Speaker

• Woofer Size: 2.5"


• Power Handling: 20W RMS / 40W Max


• Impedance: 4 Ohm


• Voice Coil: 0.8" 4-layer aluminum


• Basket: Aluminum, black powder-coated


• Sensitivity: 76.4 dB


• Resonant Frequency (Fs): 121.6 Hz


• Mounting Depth: 53 mm


• Weight: 0.73 lb woofer, approx. 1.13 lb with enclosure

Woofer Enclosure

• Type: Single Ported, 3D-Printed Composite


• Dimensions: 4.25" x 3.75" x 3.25"


• Optimized for: B2 Audio RIOT-2.5


• Design Benefits: Lightweight structure, efficient airflow, improved bass response, and modern appearance

Amplifier

• Power Amplifier Chip: TPA3116D2


• Input Voltage: DC 12V-24V


• Maximum Power Output: 100W+100W


• Channel Type: 2.0 Channel


• Input Methods: Bluetooth 5.0 & AUX


• Output Impedance: 4-8 ohms


• THD (Total Harmonic Distortion): 0.40%


• SNR (Signal-to-Noise Ratio): 75dB


• Compatible Speakers: Passive speakers, 20-200W, 4-8-Ohm


• Bluetooth Range: Up to 15m

Amplifier Enclosure:

• 4.08" x 3.2" x 1.30"