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  1. Hi, I am having trouble finding the Fc of a sealed enclosure using the IM-SG. I have followed the instructions in the manual: connect the leads to the speakers, turn on unit, start at lowest frequency and increase until you find peak impedance. The problem is it tells me peak impedance is 8.4 ohms at 30.X hz, fluctuates around 30.1-30.3. It drops to 5-6 ohms as you keep increasing frequency, then goes up to 7.6-7.7 at around 65 hz. The setup is two Elemental Design's EHQS 12s in a truck box, less than 2.0 cubes sealed. These subs never had much output below about 50-60 hz, in fact they ar
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