seriousdetecting.comAnswer
May 21, 2026 - 04:20 PM
The DD (Double-D) configuration on the INV56 coil delivers superior ground balancing in mineralized soil, wet sand, and saltwater environments compared to concentric coil designs. DD coils transmit and receive signals in overlapping D-shaped patterns, which reduces ground interference and maintains target separation even when soil conditions are challenging. This makes the INV56 effective in iron-rich ground, black sand beaches, and areas with high salt content. The DD design also provides better depth on larger targets and maintains signal clarity at the edges of the coil's detection field, which is critical when you're covering ground quickly with a 22x19 footprint.
