I don't believe that that's true.

1) I was told by someone in the industry, that the digital filters used for BM are designed to mimic analog filters.

2) If you hunt around Secrets, there is an article by Brian Florian on why multiple (individual) crossovers are a bad idea. I can actually refute most of his arguments, but he does state that when you use individual crossovers, the shifts are different for the different frequencies. That has been backed up by tech support people at a few companies I know.

Plus, Anthem (one of them) has a special setting in their software to do the following. They have individual high passes but a global low pass. The wrong way to do it IMO, because you either leave holes in the coverage or overlaps unless you set all the filters to the same exact number. But anyway. There is a scenario that allows the full range LFE signal to be combined with the globally low passed info from the mains. But with the shift that takes place for the low passed info from the mains but not the full range LFE info, you get phase effects (and cancellation). So there is a special setting to artificially adjust the delay of the full range LFE info so it combines more in phase with the globally low passed mains info.

Now, if the global low pass filter didn't introduce any phase effects, you wouldn't need that special adjustment. But it's there nonetheless.

But personally, I don't understand *why* digital crossovers are designed this way. But that seems to be the way it is.

TD- your first link is for an antialiasing filter which is an FIR filter. Obviously, a different application than crossovers in a pre/pro. Good info, but I can only conclude that this *isn't* the type of filter (usually) used for digital crossovers for BM. I still have my connections at Anthem and Lexicon, so maybe I'll ask. Good info!

SH and BB4TB- Yes, I understand the phase effects. Same slope, same phase shift. I guess I need to do lttile bit more research into:

a) If a L-R 24/24 crossover is the best, why don't more companies use it?

b) Why my simplistic argument about the matching slopes (by freq) on either side of the crossover doesn't work.