Can you smell what Brando's cooking!? - Page 9

Can we all just move on from the Life and Fights of Earl Geddes please? Plenty of other threads for that, and he may even answer back in a couple tehm.

LTD02> I've posted plenty of off axis measurements of teh QSC horn. What are you looking for?

I'm hoping so. For aesthetic reasons I'd much rather keep the cabinet layout I have now, but with the woofer rear mounted and with a nice roundover. Looks much better than having the horn on some funky pedestal, especially a 1 1/2" tall one. Although I suppose I could combine methods and recess the woofer 3/4" to 1" and make the horn spacer 3/4" so the baffle wouldn't look goofy. Hopefully the roundover does the trick, but I tend to be a perfectionist and find the easy way is almost never the right way.

How deep does JBL mount the driver in the product you mention? And you have seen actual measurements confirming the response?

I think the active version is close to done (using the original cabinets), with maybe some minor tweaks after actual listening. The modeled response is excellent and right now I'm just focusing on pulling off the same thing with the passive version.

Then maybe play around with other drivers this winter, some cheaper and some more expensive.

I'll be visiting RMAF on Sunday and bringing my speakers to a GTG afterward. Why?

Thanks for the complement! The active version looks good for sure, but I haven't been able to get anything done for the passive version for a good week. That was what I planned on bringing to Tom's, but I may have to see how easily we can insert the DCX into his system if push comes to shove. I'd pretty much have to finish a draft crossover in teh next couple days so I could have parts in time for the GTG. That's not looking like it's gonna happen. Work work work until the end of October

I won't have a chance to hear them until next sunday at the RMAF gtg. I work everyday this week, 12 hours a day.

Far as I can tell I can only use one HP/LP per output, with as many shelves or PEQs as I have memory resources for. So have I had to use a PEQ with both the HP and LP to help shape the roll off. This is with the current 1.16 firmware.

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.

Oh it doesn't bother me any. I'm in no competition. There are a lot of paths to high quality sound I think, and I don't really push any which way as long as the methodology is solid. This is a hobby and a lot us take it way too seriously. And I don't mean the little arguments here but the downright nastiness at some of the other forums. As polarized as some of the others are you certainly would never see a high effeciency PA design and a tiny Bose type system from the same designer! And I have an open baffle and more conventional 3 way in the back of head. So I hope I don't come off as too dogmatic.

Yeah I can't wait to hear his Ardents next weekend. The NeoD was a big inspiration for me, and now I have a taste for low order slopes and small mids. The Accuton 3" mid is something I'd like to use too, so it will be interesting to see how it sounds.

Unfortunately my being unable to listen to these has nothing to do with not having a crossover developed, but everything to do with literally working every day, 12 hours a day. The money is good, but quality of life doesn't have a price tag.

How low have you guys pushed the QSC/DE250 crossover? How does it sound?

Dennis I sure appreciate all the help and support you've given me over the last couple years-it's been indispensable on a number of occasions!

I don't want to compare myself to anyone, especially not people who have been doing this for MUCH longer than me. I'm still learning new things everyday and still make rookie mistakes. I think these two projects will be pretty popular and have really stepped up my game in know-how, but at the end of the day I'm still a hobbyist.

The only thing that makes me scratch my head is Wayne's outdated method (SPICE is so 1990). Earl I have huge respect for, but sometimes his position does baffle me a bit. But what do I know? I can just do what seems right to me, I don't have the inclination to argue about it on forums anymore.

What the heck Zilch, why can't I register augerpro at AK? I can't see any of the plots Jack is posting.