This is why I keep telling people on here to ignore the numbers, in fact tape over the VDI/VDU & use your ears. You will be lead wrong by the best in the market if you pay attention to the numbers & or depth. Its called a 'bell & whistle' & like fishing the lures catch more fisherman than fish. Even discrimination can halm your depth. Another analogy is those military people who learnt radar signals/returns by ear & later they had a computer to do it for them. The experienced oldtimers could out perform the computers.