When a speaker cabinet produces a distorted output at certain volumes, and at certain frequencies, I am wondering what the true culprit is. If your speaker has a usable range of say 60 hz to 5khz, with -3db at 50hz and -10db at 40hz... (seems to be common for many 10s) then would you be more likely to produce a speaker fart if the cabinet was tuned lower than the speakers could go? Or perhaps if the cabinet was too small for the speakers would that produce the distortion? Or is it more of a case where the speaker is pour quality so it distorts instead of just attenuating a clean signal? Thanks!