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Merge pull request #4 from enummusic/patch-1
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comment on 266-4th-order-linkwitz-riley-filters.rst
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bdejong authored Jun 25, 2021
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Seems there is a fundamental problem with the HPF coefficients in this code :(
The LF Noise for both LR2 and LR4 appears to be a modulating DC offset - maybe that can guide the Filter Gurus to identify and solve the problem.
Cheers.....Chris
- **Date**: 2020-05-25 01:45:00
- **By**: enummusic

.. code-block:: text
In my experience, simply changing all the variables used in LRCrossoverFilter::setup() and processBlock() to doubles is sufficient to reduce/eliminate noise, thanks to an idea from here: https://www.musicdsp.org/en/latest/Filters/232-type-lpf-24db-oct.html
"It turns out, that the filter is only unstable if the coefficient/state precision isn't high enough. Using double instead of single precision already makes it a lot more stable."

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