PhaseTech said:The GP series still have the best audio response in my opinion of any gold detector. They were the last of the analogues.
So that would explain why I loved the audio of a SD2200v2 I had a go at compared to my gpx. The SD had a sweet tone and my gpx feels more electronic if that makes sense.
After a little play with SD I'm sure I could find gold with it so the GP would be even better.