Something that I discovered when hunting this weekend that really surprised me .... I have been surprised by the different tones that I am hearing with various headphones ......For the first time , I borrowed my partners Gray Ghost Ultimates ......The first thing I noticed was that they really gave a RAW tone to the signal .....I could really hear what was making up the tone in Spades !!....It was not smooth and muffled like I was hearing with my Koss phones .... I dont know about you guys , but when my Sensitivity and my Threshold are up a bit , when on a Saltwater beach , the ground can get pretty noisy ...... Then you have the people, and the waves , etc ...... One TREMENDOUSLY GREAT feature that I noticed using these phones was the built in compressor ......What a GREAT tool ....Not only did it lower the shock of a LOUD surface target , but it balanced out ALL the tones and dropped them down in decibles so that I could hear EVERYTHING that was going on , but at a much lower volume ..... You could still hear every nuance of the signal , but it was much lower in volume and much more balanced and much more clear !!...... I stood there for a minute in aw of what I was now hearing without the detector BLASTING in my ear all the time ...... Sometimes you want to run a ittle hot to get some depth .... I realize that everyone wants to have a quiet running machine as do I , but sometimes you need to run hotter to get down to some deep depths of those whispy, soft , sounding signals that are DEEEEEEEEEP .....You guys that run their machines this way know just what I am talking about ..... Thie built in compressor circuit allows you to run a LOT hotter ( noisier) , but it's tollerable in your ears because it's not ripping your head off and driving you crazy ...... Perhaps I'm preaching to the choir here, but I have never had such a revalation for my ears as I did hearing this ..... So the compressor / limiter circuit in these headphones not only quiets the peaks when you hit a surface target , but it balances ALL the signal and makes it extremely tollerable to listen to at extended periods of time ...... My partner said that a LONG TIME AGO , someone told him that the first major upgrade that you need for ANY metal detector should be a good set of headphones ....... This weekend , and this statement made a believer out of me !!....... Just so you know , I have 5 sets of headphones , and none of them are designed for detecting ...I am FLOORED by headphones that are built specifically for detecting ..... I'm NOT advocating for the Ultimates ...I merely meniton these because these are the ones that I was listening to at the time ....There are other companies out there that have built in compressor/ limiters in thier phones too ...... If you don't have a good set of phones , I can honestly say that you should consider buying a set BEFORE you even consider buying your next upgrade in purchasing a new coil !!..... It really DOES make a HUGE difference ......JIm