I'll check it. I'm curious about how much the -3db point should change with slope. So far I've not found any specific reference.
Looks like I hit Edit instead of post reply. I edit my posts sometimes, sorry for dropping your comments. I can't recover them, they aren't in the email notification.
You said that there was a 1000Hz difference. That certainly sounds to be wrong. One thing I note in the article at Rane
, halfway down, is this:
The textbook low-pass Bessel is often designed for an approximate time delay...rather than for the common -3 dB or -6 dB level at the design frequency used for crossovers.
This is my concern. I used standard coefficient tables and did not adjust them, I don't yet know what changes would be required. That may be the issue, but I don't know yet.