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Old 13th April 2005, 03:20 AM   #11
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the Vifa woofer has a good reputation, but I think you're stretching it going up to 5K. Although the on axis response goes up to 5K fairly smoothly, that little shelf up to 8K indicates some breakup modes that may not sound nice if you don't roll it off sooner. Not as bad as some of the metal cones, but I think you'll like it better rolled off sooner.

Also, notice that the off axis response drops significantly well before 5KHz - this is the "beaming" effect of a 6.5" driver. Your polar response will have a larger discontinuity crossing it out at 5K than something lower. This means that there will be significantly more reflected sound in the tweeter range than just below it. The Harman white papers are interesting references. They claim smooth polar response is a good indicator of good sound. http://www.harman.com/wp/index.jsp?articleId=default

The good news is you shouldn't have any trouble finding a tweeter that will handle a 2500-3000 Hz XO as long as you keep it better than 2nd order. The Founteks have a minimum recommended XO of 2nd order/2500 hz. I plan to XO there using a 4th order LR.
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Old 13th April 2005, 07:21 AM   #12
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do any of you ppl know any good sites on the net besides partsexpress and maddisound that sells drivers? i've been google'n for hours and could not find much in the way of driver retailers.

the phl's look nice... i would like to here an example, who uses them in there system designs other than diy?


BobEllis- your most likely right about streaching the vifa to 5k, i was talking to a friend of mine and he said when he built his speakers using the unsheilded vifa, that he had to rework his x-over to drop the role-off to around 3200Hz, he said they sound better too. thanx
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Old 13th April 2005, 10:32 AM   #13
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zalytron, meniscusaudio, northcreek, orcadesign, speakercity, adireaudio and others. apexjr also has some drivers in his surplus collection. I've done most of my speaker business with zalytron, Elliot is a decent guy who is helpful when I was a newbie.

also have a look here: http://ldsg.snippets.org/appdx-f.php3#DISTRIBUTORS lots of good info on the site as well
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Old 13th April 2005, 12:27 PM   #14
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Regarding the Ribbon and planar tweeters. I too had used good silk domes for a decade, and when Fountek JP3 came along, I got the urge for a ribbon. After hearing a competent design by Selah Audio using it, I was not that impressed. It sounded different, but not so significantly for me to buy a pair of them and use them

The same thing happened after hearing a speaker that used the BG NEO3 planar tweeter. It's different than a dome, but subtly so.

Of course, other folks are more favorably impressed by them. But I think it's telling that both Siegfried Linkwitz (http://www.linkwitzlab.com/)and John Kreskovsky (http://www.musicanddesign.com/)chose a dome tweeter for their most ambitious designs.
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Old 13th April 2005, 01:14 PM   #15
gary f is offline gary f  Canada
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If you need a mid, the Vifa P13 would be better than the P17WJ.

http://www.nutshellhifi.com/Ariel.html

And a PHL mid would push the efficiency of the system up and be more adequate for a ribbon (95dB/w)

F
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Old 21st April 2005, 09:17 AM   #16
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hello all,
ive been doing some looking around on the net for info on planer tweeters, looking at examples and such. from what it looks like, planers are best used in 3-way configurations so one could use a smaller more suitable mid, and then match it to a woofer like a 8" or a 10". like you ppl were saying, a more powerful mid is needed. so i think im going to go with a 1" silk dome for my project, BUT, i do now have a few ideas for some natty looking 3-way designs. i have some sketches down for now.
i was wondering, back in 2000, i picked up a pair of "optimus" pro-x88av 2-ways for surround speakers in my first apartment, now they sit next to my computer hooked up to my old pioneer 5.1 ready receiver for the pc... i was wondering, the tweeter element in them, would that be a form of planer? as with the emit tweeter in my infinity cs3008 3-ways (that is what ive heard)? if so then i have my examples right here. any more input would be great, im just trying to collect as much info as possible so i could make the best decision right now... thanx
oh and i almost forgot, thanx for all the info on driver retailers, that was great...
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