texasyankee said:
Is upgrading to the 11" DD Coil on my Delta 4000 worth the investment? If so, any suggestions for the best place to purchase?
This is a broad-based question because the post reader doesn't know where your live and hunt, or the type of ground you are dealing with.
Also missing is information about the type of detecting you do, be it for typical urban coin sites, farm field, iron-littered ghost towns or homesteads, sports-fields, etc., etc.
I'll add another dimension in consideration and that is how often you opt to search in a traditional All Metal mode Vs hunting in the Discriminate mode.
Finally, I'll presume you're using the turn-on-and-go Delta with the stock round 8" search coil. This leaves me wondering why you think a larger size coil of a different configuration (Double-D Vs Concentric) is something that might be helpful for your hunting needs? Also, if you hunt in any trashier sites, do you have or have you considered a smaller-size search coil? I have used smaller-than-stock coils for the majority of my 48 years of detecting.
As for where to purchase an accessory search coil, my suggestion would be to try and locate a local dealer who stocks what you need. Visit them and try an accessory coil on your detector first to make sure it provides the performance you're looking for. I can't tell you how many times I have acquired a coil in the past that fell way short of what I imagined (or heard rumored) it would do, and t this day I meet many people who buy a coil w/o checking it out first, only to be discouraged.
If I still had a extra 11" DD I'd make you a heck of a deal on it, but I haven't been thrilled with the performance compared to other coils for my types of sites and hunting needs and I sold all my 11' DD coils. On my G2 I like the sub-5" round DD, and for open area searches I prefer the solid 5X10 DD to the 11+" DD. On my Omega I like the stock 5