Originally Posted by Mfusick
I can see that, it sounds like you really want an m2/LSR like waveguide
Can't blame you there!
I guess finding the next closest thing DIY is what you are trying to do?
The M2 waveguide is quite nice, does require a fair bit of DSP for the D2 CD to sound it's best (looks to require significantly less for the 4" diaphragm CD'S from JBL Pro). Looking at my space the cornerhorn will be nearly perfect as it has constant directivity from 200 Hz up, and fully horn loaded from 60 Hz or so. Wayne has spent a lot of time on the XO and has a level of expertise that I will never attain.
When completed I should have a pretty solid powercurve. I also have the plans for an 18" JBL 24xx driver based bass horn . That would be beastly to say the least, and is a future step when I buy new 18's for the 4645C enclosures (most likely the JBL 2269).
Originally Posted by kuzul
The horn is just a horn, if the dispersion and directivity will work for the application (90 x 40) why not load it with some drivers of your choice. The mackie crosses from 6" to 15" at 700 hz, but if you don't need extreme power handling, you could probably go a little lower.
There was talk about the parham midhorn, just throwing out an alternative.
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This horn may be a solid performer, but I don't know that to be true and it would drive me nuts. I would also have to design and XO from scratch. I was thinking of taking this approach a few months ago, but the more I studied the more I realized I would rather replicate an existing design that best suits my needs.
The 7 Pi has been around since the 1980's and offers solid performance using drivers I already own (except the mid horn which calls for the Eminence Delta 10 or the JBL2212 [which is practically unobtainable]). Once I build with the Eminence driver I will then play around with the current crop of JBL Pro 10" drivers to see if any sound and/or measure better than the eminence. I will also likely try the Eminence Kappa lite 3010MB driver.
End goal is to have all JBL Pro drivers that are still readily available in case anyone else wants to build the finalized product. I will be making tons of measurements (both outdoor and indoor). I am thinking about talking to the Commanding Officer at work about using one of our anechoic chambers after hours. That may not be feasible as where I work is 100% externally funded and no way could I charge the time to any existing research program.