White’s Electronics Spectra V3 - Manual (Page 23)

Complete Owner’s Guide - Spectra 23
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Ground Filter -
• Filtering out ground minerals allows deeper penetration (detection depth) in mineralized grounds and
also determines the ideal search coil or loop sweep for optimum performance. Less ground filtering in low ground
mineral areas increases depth, however, doesn’t penetrate high mineral ground well. By adjusting ground filtering
the Spectra can be optimized for the regional ground conditions and search coil sweep speed. Use ARROW Left &
Right to select custom ground filtration. Lower filters (5.0 Hz Band) favor slower search coil sweep speeds. Higher
frequency selections (12.5 Hz High) tend to favor faster search coil sweep speeds.
• Modern metal detector ground filtration, because it is no longer a specific set of components that equal a
specific filter, has never been well described nor understood. Modern designs are better described by their speed
(Hz) rather than their quantity or cycles. The ideal setting for your ground type is the one that offers the greatest
depth penetration that also works best with your personal and typical search coil sweep speed.
• Your ideal setting for a search coil sweep speed and habits, may not be the best for another person in the
same grounds.
• Typically the lower number Hz are better suited for slower search coil sweep speeds. The BAND (full-
range version) of each filter speed works better for lower ground mineral conditions. The HIGH (high pass version)
is better suited to higher ground mineral conditions.
• 5.0 Hz Band Pass – Slowest search coil sweeps and lowest ground mineral types.
• 5.0 Hz High (High Pass Filtering) - Slightly higher ground mineralization.
• 7.5 Hz Band Pass - Slow to medium search coil sweep speeds and low to medium
ground mineralization.
• 7.5 High (High Pass Filtering) - Medium to high ground mineralization.
• 10.0 Hz Band Pass - Normal to brisker loop sweep speeds and high ground
mineralization. (Preset for most factory programs)
• 10.0 Hz High (High Pass Filter) - Even higher ground mineralization.
• 12.5 Hz Band - Extreme ground mineralization with relatively quick loop sweeps.
• 12.5 High (High Pass Filter) - Even more extreme ground mineralization.
• A normal search coils sweep rate is 2 seconds from left to right, and two seconds returning from right to
left, best suited to average ground mineralization and the 10.0 Hz settings.