Doug I don't understand all the workings of any detector. Lets stop all the debating by experts and bench testing results which I don't understand anyhow. All you have to do is send Montana Bob, Chris, or Rob a prototype to test and report the results. You may also sent one to Lucky Lunde and Shep to test in CA, and to Reno or Lunk to try in NV. If they say that your machine will work as well as the 2100 to the 4500 ML and costs less than a grand I will buy one to use as a backup detector to my 4000. I just want to hear what some of the expert detectorists report. I trust these fellows judgement and honesty. Just send them a detector to try out. Simple ain't it?