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<blockquote data-quote="mbasko" data-source="post: 168336" data-attributes="member: 4485"><p>That seems to be a general rule of thumb.</p><p>11" mono = 14" DD</p><p>14" mono = 16-18" DD etc. etc.</p><p>By design the DD will be more stable in highly mineralised ground & can actually detect deeper than a mono. The disadvantage is less sensitivity to smaller gold & less depth in milder conditions than the equivalent sized mono. I have never seen any definitive testing on actual depth losses & have always just gone with the fact detector & coil manufacturers tell us you will lose some depth with a DD in all but the most highly mineralised ground.</p><p>DD's can also have an advantage in high EMI/interference areas.</p><p>Like Condor says though if the ground is iron infested or you aren't happy with how the mono is performing for you re: noise etc. then worrying about loss of depth is obsolete. If you can comfortably use a DD or find it's effectively blanking the majority of iron junk then it will be more advantageous than anything. Any loss of depth will be inconsequential.</p></blockquote><p></p>
[QUOTE="mbasko, post: 168336, member: 4485"] That seems to be a general rule of thumb. 11" mono = 14" DD 14" mono = 16-18" DD etc. etc. By design the DD will be more stable in highly mineralised ground & can actually detect deeper than a mono. The disadvantage is less sensitivity to smaller gold & less depth in milder conditions than the equivalent sized mono. I have never seen any definitive testing on actual depth losses & have always just gone with the fact detector & coil manufacturers tell us you will lose some depth with a DD in all but the most highly mineralised ground. DD's can also have an advantage in high EMI/interference areas. Like Condor says though if the ground is iron infested or you aren't happy with how the mono is performing for you re: noise etc. then worrying about loss of depth is obsolete. If you can comfortably use a DD or find it's effectively blanking the majority of iron junk then it will be more advantageous than anything. Any loss of depth will be inconsequential. [/QUOTE]
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