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RE: An added complication is the non-linearity of the "Phenomenon of the 'Weak Fundamental' "

>One example: The lowest string of a 4-string electric bass guitar is E,
>usually tuned to around 41Hz (the numbers to the right of the decimal
>point don't make a difference). 41Hz has a wavelength of 27.5 feet. To
>begin to do full justice to the frequency, you need a string length of
>6.7 feet. Not gonna happen!!!
>
>So, in real life, the low E of an electric bass is a "Weak Fundamental,"
>which means that the octave harmonic of Low E, E = 82Hz, is 6dB louder,
>which is perceptually twice as loud.

Fig.3 at the link below and the table below the graph show the levels of
the harmonics of the bass guitar's open E string. The second harmonic is
almost 12dB higher in level than the fundamental.

>So, engineering a BSC network is as far as I know a trial and error
>iterative process, with lots of measurements. The designer of the final
>crossover for my current project put more than 50 hours work into it.
>JA, please comment!

The baffle step compensation can be achieved in a second-order low-pass
crossover filter by using an inductor with a relatively high series
resistance. However, this reduces sensitivity. But yes, optimizing BSC
is very much a matter of trial and error.

John Atkinson
Technical Editor, Stereophile


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