Hi Mark,
Thank you for your thoughts!
I am advocating the use of less ringing (less group delay) minimum phase filters as LR24 for example. They are taking just half of taps as necessary for linear phase filters. Then you can add time correction filter to make that crossover linear phase if you like. It takes just12 ms (and respective number of taps) as in previous example.
You can have on hand two presets – one with zero latency by with some group delay,
another - with linear phase (flat group delay) but with some few ms of latency.
When we are using linear phase filters we are hoping that ringing of one filter will be compensated by ringing of other filter next to it – ringings are out of phase.
It is very utopia hope. As you now, we can use two loudspeakers out of phase but will never get complete compensation of sounds of each other.
Especial, in case when loudspeakers have different construction.
We need to use a correction to make they transfer as identical as possible to go close to that task as possible.
But, if we can use a correction, we do not need to use steep (ringing) filters and the risk of audibility of filter ringing is much less.
All APL solutions (units, plugin) are supporting WAV format FIRs to be uploaded to them.
It is high devastation to use FIRs only for a crossover ...
