Iron Bias - What It Is
From the Minelab Equinox Owner's Manual page 52:
Iron Bias (Advanced Setting)
The Iron Bias setting adjusts the likelihood of the detector to identify a target as iron if it presents both ferrous and non-ferrous signals.
All ferrous targets produce a combination of a ferrous and nonferrous response. Large ferrous targets can even present a stronger non-ferrous response. Also, a ferrous target adjacent to a nonferrous target can produce a similar response.
The Iron Bias Settin
Well things have changed since this was written because ML has come out with an update that includes two different iron bias filters - The Original called FE and a new one called F2. F2 seems to have a greater range of effect than FE so I use that as my iron bias filter instead of FE. The default setting for F2 is 6 for all modes (EQ 800) or 2 for the EQ 600. The primary purpose of the Iron Bias filter is to force probable iron to sound like iron (low tone) instead of falsing high which tend