Hi everyone,
I’d like to share a project I recently completed: ZeroPassive BoomBox, a compact, budget-friendly, bi-amped speaker system designed especially for DJs and party use.
What makes it special:
The project is fully open-source — including the SigmaStudio config, crossover design, BOM, enclosure notes, and even some tuning tips.
🔗 GitHub repo: https://github.com/babay78/zp
I’ve used a Wondom JAB5 board with Bluetooth input enabled by default, and it worked out of the box. The 3FR30V2 drivers are mounted in their own sealed sub-enclosures (I used 75mm PVC pipes with end caps inside the cabinet) to avoid interference from the woofer pressure.
And of course I wasn't alone. The speakers were chosen by my friend, who repairs them professionally. And all the logic and firmware filters were helped by another talented physicist who loves sound. We even honestly went to nature and tuned them in the open air.
And have fun!
I’d like to share a project I recently completed: ZeroPassive BoomBox, a compact, budget-friendly, bi-amped speaker system designed especially for DJs and party use.
What makes it special:
- No passive crossover — all filtering is done digitally via SigmaStudio on the ADAU1701 (Wondom JAB5 board)
- Two-way configuration:
- Woofer: Beyma 12BR70
- Mid/High: 4× Beyma 3FR30V2
- Each driver group has its own amplifier channel and DSP filters
- The result: tight, punchy low-end, great projection for small events, and surprisingly hi-fi sound at low cost
The project is fully open-source — including the SigmaStudio config, crossover design, BOM, enclosure notes, and even some tuning tips.
🔗 GitHub repo: https://github.com/babay78/zp
I’ve used a Wondom JAB5 board with Bluetooth input enabled by default, and it worked out of the box. The 3FR30V2 drivers are mounted in their own sealed sub-enclosures (I used 75mm PVC pipes with end caps inside the cabinet) to avoid interference from the woofer pressure.
And of course I wasn't alone. The speakers were chosen by my friend, who repairs them professionally. And all the logic and firmware filters were helped by another talented physicist who loves sound. We even honestly went to nature and tuned them in the open air.
And have fun!
