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Old 1st February 2008, 12:08 AM   #221
John L is offline John L  United States
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Would be nice to try out, but I don't have Mac. I wish it supported linux.
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Old 1st February 2008, 12:18 AM   #222
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There's Arta and Speaker Workshop (what I use). Not sure about Arta, but there's quite a learning curve with SW and you need to gear up on your own. Mic, mic pre-amp and the testing jig are needed. Test jig needs to be build.
Calibrating this setup will make the surface of your brain itchy. I was begging for mercy after a day or two of trying to make it function properly.
I am clinically insane now, so I can work it perfectly.

Soundeasy sounds...easier
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Old 1st February 2008, 12:51 AM   #223
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Quote:
Originally posted by John L
Would be nice to try out, but I don't have Mac. I wish it supported linux.
Fuzzmeasure relies heavily on Core Audio built into OS X and on the programming interface that OS X inherited from NeXT Step. A port to Linux or Windows would take at least 10x the work (if possible at all) and as we are talking about 1 guy with a more than full time day job just pushing forward the Mac version is hard enuff... If there was a Linux or Windows version the development & support costs would go up enuff that it would be cheaper to just go out and buy a Mac (which BTW is happening at a huge rate... the market growth of the Mac is growing at at least 4x the rate of the industry avaerage and accelerating -- a majority of this growth is people abandoning Windows. That the new Intel machines, and virtualization sw like parallels and VMWare, make the Macintosh the best platform to run Windows on these days does not hurt at all either). For sometime the Mac has been the top laptop choice of Linux geeks,

And given that an average Mac has a useful lifetime twice that of a Windows machine and starts out comparably priced to a similar quality PC, they are considerably cheaper now-a-days.

</macevangelism>

dave
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Old 2nd February 2008, 02:14 AM   #224
John L is offline John L  United States
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Today I picked up some magnets. So this evening I took out the phase plug and drilled two holes into the bottom of the plug.

Click the image to open in full size.

And here are the holes filled with the magnets.

Click the image to open in full size.

I tried them on the speaker, and they set very nicely. My only negative thought was that I perhaps should have drilled three holes and inserted three magnets for extra hold. As you can see, it would have been easy for me to have done three. Perhaps I will do that when I redo the PPs.

Anyway, everything is working well. Now, the biggest hurtle is that of turning the four diffusion lense parts. Perhaps next week on that. But I still have other things to do til then.
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Old 2nd February 2008, 03:49 AM   #225
Variac is offline Variac  United States
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I reported on my beginning B20 mods here in the already established B20 driver thread

http://www.diyaudio.com/forums/showt...19#post1417319

It might be nice to split some of these posts just about the driver to there too. That thread was established to discuss the driver and mods to it only, so that members will get all the info available. Now mods that relate only to this speaker in this thread should stay here- any objections?
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Old 2nd February 2008, 10:52 AM   #226
John L is offline John L  United States
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Quote:
Originally posted by Variac
I reported on my beginning B20 mods here in the already established B20 driver thread

http://www.diyaudio.com/forums/showt...19#post1417319

It might be nice to split some of these posts just about the driver to there too. That thread was established to discuss the driver and mods to it only, so that members will get all the info available. Now mods that relate only to this speaker in this thread should stay here- any objections?
I have an even better idea. Why don't you tell me which posts you would like to go there, and I will copy them there, so they can be in both places. That way I can also move the pictures too.
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Old 16th February 2008, 03:05 PM   #227
Bluto is offline Bluto  United States
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John, Dave , Variac, Et Al .....

1st off, thanks so much for tutorial John. Excellent work, great ideas and many pre- thought problems solved right here.

Apologies if I missed answers to my queries as there is so much info on B20 and hard to keep it all sorted.

These Oaktons I referred to in my CSS driver post are made the same way as the B20 with mods - tweet mounted in voice coil. I have a 2nd set that is simply an FR with a whizzer that I've played with by adding an Onkyo tweet that I got at P.E.'s buy out price. I'll buy 2 of anything that costs 20 cents!

Different drivers but same principles.

I can't detect an audible difference between the 2 on A-B testing. Although I like the mod itself as well as appearance this has me wondering if any measurable comparisons have been done as to difference with tweet added as a mod (a basic coax) or the tweet mounted separately ? The mod is not that extensive but if there is no advantage ( I understand with Johns application) other than cosmetics why bother? The questions posed as to tweeter effecting FR's motor in this configuration also fuel this question.

Bluto
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Old 16th February 2008, 03:23 PM   #228
John L is offline John L  United States
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Quote:
Originally posted by Bluto


I can't detect an audible difference between the 2 on A-B testing. Although I like the mod itself as well as appearance this has me wondering if any measurable comparisons have been done as to difference with tweet added as a mod (a basic coax) or the tweet mounted separately ? The mod is not that extensive but if there is no advantage ( I understand with Johns application) other than cosmetics why bother? The questions posed as to tweeter effecting FR's motor in this configuration also fuel this question.

Bluto
Bluto, I can't definitively answer your question here, because I lack the necessary equipment and expertise to accurately test an A/B comparrison. And as you state, I have a more utalitarian motive here, in that I am limited in the space where to mount the tweeter.

It would be nice to see an accurate graph of the two, side by side, along with all the modifications rendered to one set.

I would also like to see just what an "enabled" driver really does in comparrison to the 'stock' driver.

As I have stated elsewhere, once I complete this project, I am going to do another one, with modifications. I haven't decided yet whether to set a 12" low end driver, firing from the bottom of the enclosure, or look until I locate the perfect 12" to go along wigh a compression horn, and mount it in the up firing position.

If I pursue the former, I will most likely keep the B20/tweet combination on top, and use the B20 for mid/bass duty.

Now, If I can just get an opening with my instructor, so I can finish those diffraction lenses, and complete this thing. I'll probably add to this thread with the next project.
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Old 16th February 2008, 05:16 PM   #229
Bluto is offline Bluto  United States
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John L -

Isn't it fascinating what all has been done with that B20? I'd been intrigued by it for a long time, met Dave via Ebay while I was unaware of this site who advised me to check it out.

My only testing equipment is my ears but I'm certain someone will test if it hasn't already been done.

Interesting thoughts regarding your planned 2nd project as part of reason for my question was my thoughts were running in the same direction but I had thought of using the other Pio or the Dayton DC200 for low end . Wondered if it would be beneficial to eliminate extra space needed on baffle for mounting tweet. I've been playing with something similiar to what MisterTwister is doing using multiples of NSB's and Polk 5.25" from their Monitor 60 design and little tweets. I think that MT's design with the 2 drivers as you describe would sound plenty full.

I'm pretty excited after hearing what these Oakton's can do and must believe based upon all thats been said the B20 would even sound better. Right now I'm running the Oaktons with a Tandy 8" 'supposed' Sub driver and the way the 2 integrated really surprised me. Not sure what I'll end up with for enclosure but nice to know B20's will fit when I'm ready to upgrade.

By all means keep thread alive, it's both interesting and informative.

Thanks - Bluto
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Old 19th April 2008, 02:25 PM   #230
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Hi

does anyone know the crossover details of the Duevel speakers say like the Jupiter? I suspect the Xover frequency is between mid and tweet is VERY low, requiring a tweeter that can be crossed over VERY low, are such special tweeters available for DIY? I have a unused diffuser floating around that I would like to use in surround speakers - its similar shape to the Duevels.
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