I just received my Excalibur back from Minelab after they fitted the Ikelite connectors on both the stock Koss and my new Gray Ghost headphones. All I can tell you is that the crispness and superb tone quality of the Gray Ghost over the Koss is remarkable. Thanks to Gulf Hunter for posting his findings of the Gray Ghost headphones. It was his excitement that got me to switch over. I can use the stock Koss phones if needed, as a back up. Happy hunting, John