I moved into a new home last this year and have been extremely busy and sick with a lingering illness. I just did not have time to build a new "test garden". Yesterday I finally got around to that task. I buried various coins between 4 and 8 inches. The ground has not settled,but I got ran my favorite detector(F5) through the garden. I first did this without my headphones and with my somewhat bad hearing, I could not hear the deeper silver coins at all. I was shocked at this because I have dug silver deeper than these buried coins. I put my original Ratphones on and repeated the test. I could hear every coin, but the deeper silver was the "whisper of a whine" that I have mentioned many times over the years. This "slight whine" is barely noticeable, but very distinct once you dig a couple of deeper coins. Anyone would miss these types of targets without phones or phones with limited audio. I also ran my other detector through the garden and this detector has a modulation on-off feature. I could not hear the deeper coins with the modulation on which really surprised me.