This great response from N2DI clarified it all for me and squares up with KJ7LVZ's reply.
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@JoeN2DI
There are only two filters: 300Hz and 500Hz. All the other filter widths are made by stacking the 300Hz and 500Hz filters, so when you select anything other than 300Hz or 500Hz, you’re cascading the 300Hz and 500Hz to make that value. Does that make sense?
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