Is it possible to build a crossover using Bessel filter similar to, dare I say it, minidsp has?
As mentioned in the documentation for the CrossoverFilter module, we use Linkwitz-Riley and Butterworth designs. However, using Biquad and BiquadCascade modules, users can implement their own designs. Also, it may be easier to implement what you have in mind using our Second Order Filter modules which implement Bessel filters in terms of cutoff frequency and Q.
Let us know if there's anything else.
Thank you Axel. Just what I needed.