Yes,
Thankyou both , David & DRG for the valuable insight .
Yes,
Thankyou both , David & DRG for the valuable insight .
FWIW,
1) Network transfer function (assume lossy L2), vert = dB
2) Network input impedance w/ series LCR, vert = ohms
3) Network input impedance w/o series LCR, vert = ohms
-grumpy
Well, there it is, then. I ordered the additional parts yesterday....Originally Posted by grumpy
Yes. I used 7.5 Ohms total (7.0 plus 0.5 for the inductor) in the circuit construction based upon earlier suggestions here and prior experience with NL200t3. It produced a "familiar" voltage drive, and made a good starting point, from the RTA results.Originally Posted by ndnorth
Thank you for your insight into the circuit design. We can tweak with more assurance, now....
May we see the entire network, please?Originally Posted by DRG
We enjoy analyzing them, quite apparently.
[Hoping it's a TWO-way.... ]
It's from a three-way design. I thought it was interesting to note that the impedance leveling circuits were still being used. I would draw up the full schematic and post it but I think the tech sheet will be available soon.
People who make sound their business depend on JBL for their sound.
Thanks, DRG. Let us know with link, when available, please....Originally Posted by DRG
Hi Zilch,
Good agreement between your simulation and Grumpy's. By the way, what are the two R values for the two different notches that you show?
David
Thanks Zilch! You made it work.....
I can't stand the feeling that we have input from "inside" now
No resistance for the deep notch, 7.5 Ohms total for the shallow one.Originally Posted by ndnorth
That step compensation occurs frequently, I've found, to let the driver/horn combination play through frequencies where their inherent response is flat, apparently, i.e., "Don't mess with the GOOD stuff...."
It's more precisely achieved in S3100MKII with multiple notches:
http://audioheritage.org/vbulletin/s...205&#post67205
Only with the help and guidance of many on this forum, including yourself in significant measure, good friend!Originally Posted by Guido
The problem with this thread is I've got about 20 pair of "Keepers" now....
Not certain, but I THINK they're allowed to have fun here TOO!Originally Posted by Guido
Bummer!Originally Posted by Zilch
Now you have to start all over and do all this right.
One thing about CLIO - it's nice to have the raw data files so if you run across something actually worth saving export the data to text files.
Check out D'Appolito's book as Widget suggested.
And post them ALL here, right?Originally Posted by Giskard
[*Groan....*]
I've gotta get me another computer for the "laboratory," too. CLIO's apparently not laptop friendly, alas....
Yeah, it doesn't work too well with a laptop.
Saving the CLIO files allows them to be imported into something like Excel and manipulated easily. You can compare several output files against each other fairly easily that way.
I was kind of kidding about doing all the measurements all over again...
I had to read back through the first few pages again to find out what the goal here was. Have you satisfied your goal?
Yeah, me too. I expect it'll allow me to accomplish some refinements in the future, and understand somewhat better, is what.Originally Posted by Giskard
The goal was stated here:Originally Posted by Giskard
http://audioheritage.org/vbulletin/s...esto#post45184
It's been one Hell of a trip, and I'm about to wrap it up with a summary. Still have to complete 2507/2235/2435HPL/2352, "Tale of 10 woofers," and LE14/2407/PTH.
The essential elements are clear:
1) Extended bass woofer.
2) Constant (or controlled) directivity horn (or waveguide).
3) Compression driver with usable HF extension.
4) Passive crossover with HF boost.
Can't just throw 'em together, tho, and expect it to work worth a poop....
Regarding "Counterpoint," yes, there's an agenda between the lines, sustained with relentless passion: Big four-ways, nice as they are, are not the only viable option, and for many, not at all a practical one. A variety of two-ways built on the 4430 formula, small and large, can yield very satisfying first-class results, and they're WAY fun to do....
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