Metal detector frequency: compare the mode, not just the number.
Frequency is one part of a detector system. The model, mode, coil, target and ground all affect what you hear. Start with your exact manual, then make a controlled comparison.
Know which frequency choice you have
A single-frequency setting uses one selected operating frequency. Selectable single frequency lets you change that setting; it does not mean every option runs together. Simultaneous multifrequency uses several frequencies together. The EQUINOX 700/900 manual distinguishes these choices and limits them by mode; its Beach mode uses Multi. Check your model before assuming a feature from another detector. EQUINOX 700/900 manual, Frequency, printed p. 17.
Read kHz and pulses in context
kHz describes thousands of cycles per second in frequency specifications. Pulse-induction systems transmit pulses and analyze a timed response. Pulse repetition, timing and a VLF operating frequency are different specifications; a larger number across these systems is not a performance ranking. PI still needs appropriate ground handling. On GPX 6000, Double-D modes address interference or conductive ground; they do not provide ferrous discrimination. Minelab FAQ: GPX 6000 and ground response.
Choose for the target and the conditions
Higher-frequency options can help with small low-conductive targets, while a lower option can favor some larger high-conductive targets. These are tendencies, not universal best ranges or guaranteed depths. Soil minerals, salt, electrical noise, target orientation and masking can change the useful choice. A quieter mode may be more interpretable than a nominally sensitive but unstable one. Read the model-specific tradeoffs in your manual before changing modes.
Coil diameter alone does not determine operating frequency. Frequency choices belong to the compatible detector-and-coil system; some systems also depend on the particular coil. Check exact-model compatibility rather than assuming a connector or size establishes it. Manufacturer frequency and coil guidance.
Try one comparison you can repeat
- Record the exact model, software, coil, mode and baseline settings.
- With permission, use known removable targets on a safe surface. Keep coil height, sweep speed and direction consistent.
- Change only the supported frequency or mode. Perform the manual’s required noise-cancel or ground procedure.
- Compare repeatability, noise and target separation in both directions. Record missed targets as well as audible ones.
- Return to the baseline before changing a different control. An air or surface comparison does not prove buried depth.
Primary sources checked October 6, 2026. Original SSL learning guidance; no SSL depth measurements or universal frequency chart.