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In Reply to: An added complication is the non-linearity of the "Phenomenon of the 'Weak Fundamental' " posted by John Marks on July 21, 2024 at 07:56:50:
>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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Follow Ups
- RE: An added complication is the non-linearity of the "Phenomenon of the 'Weak Fundamental' " - John Atkinson 10:09:48 07/21/24 (4)
- "However, this reduces sensitivity." Aye, there's the rub! - John Marks 12:54:44 07/21/24 (3)
- Are you sure you understand any of it? - Doug Schneider 20:03:24 07/21/24 (0)
- Not quite understanding sensitivity? - Doug Schneider 18:49:22 07/21/24 (0)
- The reason is... - Doug Schneider 13:03:21 07/21/24 (0)