NAB 2026: DPA Microphones N-Series Firmware Update Adds Duplex Gap and Guard Band Access for North American Users

Why It Matters

By expanding usable spectrum, the update boosts channel capacity and reduces interference risk, giving broadcasters and event engineers greater reliability in increasingly congested RF settings.

Key Takeaways

• Guard Band (614‑616 MHz) usable without FCC license, up to 20 mW EIRP
• Unlicensed Duplex Gap (657‑663 MHz) adds six MHz for extra channels
• Licensed users can access full 12 MHz, supporting 24 more microphones
• Unlicensed users gain up to 16 additional wireless channels
• Firmware demo at NAB 2026 showcases real‑world performance gains

Pulse Analysis

The 600 MHz band, reclaimed after the 2017‑2020 U.S. spectrum repack, has become a critical resource for wireless audio in broadcasting and large‑scale events. As mobile broadband services reclaimed adjacent frequencies, regulators carved out a Guard Band and a Duplex Gap to preserve low‑power, unlicensed operation. Engineers have long grappled with limited channel availability, especially in dense venues where dozens of microphones compete for clean RF space. Understanding this regulatory backdrop clarifies why DPA’s firmware unlock is more than a technical tweak—it restores a portion of the spectrum that was effectively sidelined for years.

DPA’s new firmware reprograms the N‑Series transceivers to recognize the 614‑616 MHz Guard Band and the 657‑663 MHz slice of the Duplex Gap. For licensed users, the full 12 MHz becomes accessible, translating into up to 24 additional microphone channels without sacrificing signal integrity. Unlicensed users, who cannot obtain an FCC license, still benefit from the unlicensed 6 MHz, adding up to 16 channels and enabling more flexible setups for concerts, sports venues, and field productions. The update also maintains the 20 mW EIRP limit, ensuring compliance while delivering higher channel density and reduced inter‑modulation risk—key factors for engineers managing complex RF environments.

The market impact extends beyond DPA’s existing customer base. Competitors in the digital wireless audio space must now address a broader spectrum offering or risk losing market share to DPA’s enhanced capacity. The live‑event industry, which increasingly relies on high‑definition video and immersive audio, will likely see faster adoption of the N‑Series as production budgets prioritize reliability over cost‑cutting shortcuts. Demonstrating the firmware at NAB 2026 provides a real‑world validation, positioning DPA as a leader in spectrum‑efficient solutions and setting a benchmark for future regulatory‑driven innovations.