salas said:
You still need to adjust the mic stand for vertical off axis I guess.
Tech section:
2 meters I use after the 1m measurement set. It gives me a better idea of the in room trends. 1m is superior for resolution. I use midpoint between woofer and HF system's rims for 0 deg most of the time. In case of a ribbon HF I point to the ribbon. In 3 ways I do the same. I.e. I point between Mid and HF rims. Anything I must do different in your opinion?
BS section:
I would like to get a servo table moving in lock with Leap and seeing the off axis 5deg dif lines popping up. No use for me, I am not producing anything and I do not need 70s KEF reference line production control standards, but I like it robotic!
For vertical I just turn the system on its side.
You are using gated measurements right? The room shouldn't be a factor at either distance.
As I said, the definition of the axis location is pretty arbitrary, but important to keep it fixed after you pick one.
gedlee said:
Now your not being fair. These were not available 20 years ago and you havent tried them. You can say they are old technology but they are not. Yes I like the older 511B, but I've also said that this horn/wave guide is nothing like it. No comparison at all. We all have our priorities and agendas, and make time for what is in our own best interests, or what we each see as being worthwhile. Nothing wrong with that. Based on your predjudices against the older technology, I would think you would embrace this newer version. (Jbl has moved away from that older technology, and this is the result of some of that.)
Instead, you lump it into a category that you are comfortable with and claim you have moved on from that. Sorry, saying that does not make it so, now or 20 years ago. I have the utmost respect for what you have done in the field and again, are certainly entitled to your opinions.
Dont know why people ignore everything thats right in front of them, but thats certainly their right to do as well. One can spend a whole lot on any number of high frequency tops and spend a lot more money for something no better, and in most cases not as good as this giant killer.
These wave guides are not dated technology, but as has already been stated are some of JBLs latest work. Its unfortunate that you dont have time or drivers to try it, I would love to see the results you come up with. In the men time, I will continue to enjoy this unbelieveably great (and inexpensive) wave guide.
Obviously you are not interested, and that's fine, I will stop requesting otherwise, but many are, and to you who are, you will be pleasantly surprised by the spectacular results this set up is capable of. It certainly does not deserve the careless catagorization and dismissal it has been repeatedly given by Mr. Geddes, but he like all of us, is certainly entitled.
Russellc
Godzilla said:
Not yet.... just measured them yesterday. I have the crossover built and I'll be putting on some music today. I don't do subjective evaluations though.
I'm impressed with the build quality of the B&C. It is an inexpensive driver but looks as nice as any of the expensive compression drivers laying around. The FR on that horn is certainly smooth and it makes for an easy design. Like most compression drivers it doesn't have response out to 30K so you won't be able to enjoy your SACDs with the family dog but it nails the most important part of the response in terms of FR linearity.
Saurav said:
Yea... same one. The midrange measured above is the Eminence Alpa 6 with a slightly different cone. Wish I had stepped up and bought a pair of Delat Pro 8As early enough to do the show. It would BARELY fit on the baffle but would give me another 2-3dB of output in the midrange which would have been handy for the SET amps.
Godzilla said:
You betcha. Most are useing 12 inchers,I am using 15 inch JBL. Basically your driver needs to playwell to the crossover point, ( some 12 inch JBL drivers did better with the 900 Hz crossoverpoint) and there's been a little bit of everything tried with them. The thread is long, but is a must read, all sorts of info is in there to be gleened.
whoops, sorry, I thought you meant the econo wave. Kevin your speaker is most interesting, and demonstrates how great sound can be obtained for reasonable money.
Russellc
Godzilla said:
Only if they are suitable for at least a >7 kHz XO point to push it above our most acute hearing BW IMO. A good rule-of-thumb is horn mouth area be at least = the matching direct radiator's 'Sd', or ~6.5" frame size max with this horn. This allows a ~2330 Hz XO point if one accepts the ~1 WL rule-of-thumb max spacing, or to look at it another way, its 1500 Hz cut-off dictates a ~2121 Hz minimum XO point, which puts us at ~ the same frame size. Regardless, it's well into what I consider a XO's 'no man's land', so all things considered I don't see it as suitable for a high SQ HIFI or HT app two way.
GM
ZilchLab said:Call the distributor, US Speaker, to order.
The specs say the 4550 plays a bit lower, and measurements confirm that.
4552nd does seem to have more clarity at the high end.
[It's also way cool....
Thanks for that. So the JBL drivers are not worth the extra outlay? I always thought it would be nice to have an all JBL system, however it seems that perhaps there is better value to be had elsewhere.
ZilchLab said:While it might comprise a substantial compromise of your policy against expressing subjective opinion, we'd hope you'll also give consideration to telling us how they sound, as well....
There is no way that I could or would do that. I will measure the drivers and horns on my rotaing table and design a crossover in software. Thats all I can do. Listening to them would be pointless. They won't be in systems.
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