Originally Posted by ZilchLab
Don't know if you subscribe to Wayne's HF comp approach,
Bypassing a resistor around a cap to shape response HAD to have been around long before the time Wayne is taking credit for. Heck I thought of it on my own as the drooping response struck me as the mirror image of baffle step, for which the textbook correction is a coil bypassed by a resistor. When I first got into this hobby using bypass resistors to shape response seemed like a standard technique by people who had never heard of Wayne. But enough of that.
I check in with the Ewave thread to see if there any issues with the QSC since I don't have time to do much research of my own at present. I would like to see more measurements, maybe some polars when you get a chance.
Penn the phase issues I had probably aren't a real big deal to some, like I said, I like things just so. Really it's not a huge deal to me either, just unexpected and requiring close attention to correct "properly." Some of it (about 1") was due to a combination of a slight backwards tilt to my new stand and the design axis used by the mic. The two combined to magnify the difference. I corrected the tilt and raised the design axis to be 3" below the tweeter center. I could cheat and raise the design axis even higher, as the relative distance of each driver to the mic would then get closer and make the plots prettier. But I like to measure things "worst case" with no smoothing or tricks. Everything is looking more workable now, but does still require some close attention and tweaking to get the crossover where I want it. Funny thing is because you will see more detailed info on these it will probably work against its popularity. People will see the dip around the crossover far off axis and think "oh that's no good", and probably build some other design with a single on axis response posted and telling themselves it is probably better off axis. Ignorance is bliss. But I plan to show these in as realistic a light as possible. I know that other designers out there are looking at the plots I posted I thought "hmmm...that's pretty nice". They'll know just how hard it is to get response like that so far off axis.
I think Jack in the Ewave thread is sliding the horn forward so the crossover is easier. The horn of course is somewhat hanging in front of the woofer, not sure if this a big deal or not, but I've chosen to go a different direction and mount everything on a flat baffle. Probably need some measurements to really see just how well the QSC Ewave is doing since so far it's only been anecdotal listening verifying the success of the crossover.