Unless this is a trick question with some kind of subtle twist, I think you have the process spelled out correctly. I wouldn't bother going all the way up to 20 KHz, in fact other than finding resonances it probably isn't worth going past 500 or 1000 Hz.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8