Thanks for the confirmation....
Xover Pro 6 and Basta both show phase predictions.
Alas, it's a predicted response, not actual measurements. But if reality is anywhere near prediction, then a small offset could do no harm - or so goes my thinking.
My next xo point is 743Hz, which is an 18.2" wavelength. Luckily, my prediction places that crossover point at only 4 degrees out of phase - not enough to be of any concern to me.
My third xo point (between mid bass and bass) is at 281Hz, which is a wavelength of 48.1". My software varies quite a bit with this one. Currently. the mid bass leads the sub by about 90 degrees. OK, this is a problem - but the model only shows a 2db sag (something I find perplexing - shouldn't it be more?). However, to fix that problem, the mid bass would have to be a full foot back from the bass drivers. Now we're talking some substantial distance - at least some of which I would want to correct via the xover. To be honest, I see this as being a good argument
for separate subs and an equally strong argument
against them. Just a half foot and bass gets all messed up. One can screw it up either way.
Secondly, let me know if I'm getting off track here too. I'm thinking on creating something on the order of a 2" x 9/16" slope in the face instead of a discreet step. Logically, to minimize edge interferance should I want the nearest edge to be longer than a full wavelength away from the center of the driver? So that the upper edge of the slope ends at least 4 1/2 inches from the center of the tweeter and the bottom ends least 4 1/2" from the center of the midrange driver? (actually, I'm thinking that it should be
more for the mid)
I'm intuiting my way through this one, (throwing chicken bones again) could you please tell me if I'm on the right track or not?
This is somewhat inspiring as I imagine form following function but that's a matter for another thread. Meanwhile, what would be the cheapest method of taking actual phase meaurements? (I have yet to hit the lottery)
The
midrange drivers I was looking at using are on sale , so I ordered 8 of them. That's about the only thing this project has set in stone so far.