Scott, I'm using the resonance formula from "How To Set Up and Tune Your Turntable and Tonearm" by George Merrill of "Underground Sound". The formula is: F = 1/(2*Pi*sqrt(compliance*total_mass)) In my case: compliance = 20, total_mass = 11 (tonearm) + 6 (cartridge) = 17 sqrt(compliance*total_mass) = sqrt(20*17) = 18.44 Pi = 3.14159265... Thus: 1/(2*(3.14159265)*(18.44)) = 1/115.86 = 0.00863 kHz or 8.63 Hz for the resonant frequency. According to the book, the range from 8Hz to 16Hz is good, but 11Hz is best. --Larry