Best detector to upgrade for larger deep gold

[BigFoot]

Hi Woody,
In your opinion which VLF or PI machine after upgrades would work best for larger deep gold with large DD coils.
Cheers,
Bigfoot

[ronjeanosborne]

Hi big foot, I dont know why you want to use dd coils with upgrade detectors, I have a gp extreme and gpx5000 both upgrade By woody using woodys headphones you can hear a hart beat in most ground and very deep, Ron.