I have a 11" X COIL ON MY 4500. WORKED IT NEXT TO A MATES 6000 AND IT WAS PICKING UP ALL THE SMALL WHITE BIRD SHOT THE 6000 WAS GETTING , THAT THE OTHER DETECTORS MISSED. I have a 6000 now because of the les weight, still like the 4500 for big coils, but for less time detecting. With the spo1...