Peter - few speakers go down to 20hz I'm afraid. Most roll off around 35hz. Certainly, smaller, studio speakers, do not go down this low, they do not have the volume to produce the longer wavelengths for such low frequencies. And it's not so much the higher frequencies - 20khz isn't hard to do itself, it's how it's done. Odd or even harmonic distortion?
And yuck to JBL or Klipsch I might add.
Sorry, just couldn't resist since hi fi is another hobby of mine.
Dave
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