Hmmm... with the tweet and 511 sharing a common baffle at ~8kHz, (at a wavelength of roughly 1.7 inches), how many full cycles will the desired cymbal decay play on the tweet before the stick comes down on the 511?
Without breaking out a tape measure I come up with roughly around 10.
Can you say... shhtukssse?
Gehsundhit.
"[I]We're going all the way, till the wheels fall off and burn[/I]!"
Bob Dylan, from [I]Brownsville Girl[/I]
[I]"Time wounds all heels"[/I]
John Lennon, referring to the Nixon/Hoover deportation fiasco.
Whateverz......
(and who ever said they share a common baffle?)
In our last thrilling episode, our hero was backed into a corner, and...Originally Posted by Panomaniac
Followed by an (agreed with) suggestion they be oriented vertically, directly to the outsides of the 511s, next to the wall(s).
Perhaps a bad assumption on my part they'd be mounted on a baffle, so I'll rephrase that to "common plane of being".
Never mind that. The point was it would take a boxfull of caps (or the previosly suggested active delay) to stack up the needed phase delay.
"[I]We're going all the way, till the wheels fall off and burn[/I]!"
Bob Dylan, from [I]Brownsville Girl[/I]
[I]"Time wounds all heels"[/I]
John Lennon, referring to the Nixon/Hoover deportation fiasco.
Thank you.
John, I think it would be shame to take this project off-line .
Within the overall big picture , there's likely something in it for everyone .
I for one would like to see the FRs ( & IRs posted ) for your 288-8E(s) on your 511Es . Those have never before been posted on the WWW by a DIYer ( at least, that I'm aware of ) ;
Apart from GPAs recent eBay posting , some new data like that would fill a huge void out there .
- There is unfortunately not nearly as much meaningful data available for Altec stuff ( as compared to JBL ) .
Also, I'd like to see an independent FR sweep of that EV "T350" once it's crossed over . There may be some plots out there / but I haven't seen them .
FWIW, I've been waiting for you to get your test gear in order so that you could post some stuff ( under Panos guidance ) // all before I post my 288-8K stuff rigged up with my 110 db/W/M Fostex tweeters . Yes I have tweeters ( many in fact, just not hooked up ) .
Re; Brads concern about the tweeter off-set / delay thing .
- IMHO, once tweeters are crossed above 10K , "wave-length synching" is mostly an exercise in futility . The synch will fall apart at more positions than not .
- JBLs' latest SOTA systems still manage to image very well with UHF "Be" tweeters that are crossed high / even while having mismatched dispersion patterns to the horn below ( 60 deg vs 90 deg ) .
- There's a whole world of UHF physco-acoustics that doesn't necessarily follow the standard "modern" DIY rule-book . "Leading-Edge UHF Disconnect" ( from the main wavefront ) is but one interesting phenomena that shows some people prefer the sound of the UHF wavefront when it's leading the rest of the pack .
- JBLs' big 3-way & 4-way systems have done this for years by the necessity of sharing a common baffle board .
- Anyways , there you go, there are many ways to skin the proverbial cat .
cheers <> Earl K
Hey Earl, Thanks for your support and interest. That is what I was originally going to do but it is just too difficult that way.When it comes to building a speaker from scratch I'm literally learning this on the fly.And I'm trying to juggle my business and this project at once.I can't afford any distractions at all.
If you would like the data when I'm done, I would be more than happy to send to you or to anyone who would like it Privately !! I just want to remain Neutral :2thumbsup:.
BTW Pano is a tremendous teacher so is GM for that matter ! I only hope that I can be as good of a student as they are teachers.
Yeh, I can dig that . Lot's of public opinions & info to take in & then , to make sense of // perhaps it is best to run with those offering the most support .
<> cheers
Bfish, it's not the info that is objected to. The info is valuable. It's the stinky wrapper that it's delivered in that causes protest.
We'll post measurements here when they are ready. There is a steep learning curve when you are new to measuring. Details need to be sorted first.
Earl your input is always welcome. But I have no way of getting in touch w/you.
Well I guess I wasn't the only one.quote=Panomaniac;1833439]Bfish, it's not the info that is objected to. The info is valuable. It's the stinky wrapper that it's delivered in that causes protest.
Posting Permissions
Bookmarks