I recently got hold of a multimeter and was checking the ohms rating on a bunch of 15's I've been stockpiling. Everyone came out to just about the rated impedance except for 3 old JBL K140's, two of which had recently been reconed. All three came out to 6.1 ohms. So I was wondering if age has any effect on impedance with older woofers? I tried the probes every way I could on the K140's, but they always came out to be 6.1.