Multiple notch filters?

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Yes, if you wanted to have a 15dB notch filter, you could do 5 in series, but they wouldn't simply sum the way you're hoping.

Better is to notch it out line level, for such a dramatic notch. This will take some calculation (or a high-resolution equalizer).

If you must do it speaker level, you would probably have to do a multiple component filter.
 
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