Portable DIY Bluetooth Speaker

## **Portable DIY Bluetooth Speaker**
*(Makita or Parkside – Powered by ZK-TB21)*

Turn any speaker tower into a **high-power portable sound system** that leaves store-bought Bluetooth speakers in the dust.
At the heart of the build is the **ZK-TB21 amplifier module**, capable of driving **two 50 W columns** and a **100 W subwoofer** with crystal-clear sound and impressive punch.

**The best part?**
It runs on the **power tool batteries you already own**—Makita, Parkside, or compatible—so the build cost stays low while delivering impressive performance.
With 21 V from these batteries, the amplifier delivers **serious volume**, perfect for garden parties, workshops, or any outdoor event.

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### **Key Features**
- Works with **Makita or Parkside tool batteries**
- **150 W total output** (2 × 50 W + 1 × 100 W)
- Based on the proven **TPA3116D2** chip
- Compact, rugged, and DIY-friendly
- Outperforms typical commercial Bluetooth speakers

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### **Build Varia