Vifa P21WO-39-08 - diyAudio
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Old 17th December 2005, 06:43 AM   #1
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Default Vifa P21WO-39-08

Has anyone heard this woofer in a 2-way speaker?
How does it perform in the upper frequency?
I'm a little bit scared by the peaks and dips that it has between
200hz-3000hz!
There's a big 2,5/3db peak around 1000hz!
Should I worry so much?
Do you think it would be possible to cross it higher than 1,8K?

WinISD shows a nice response in a 50Liters enclosure tuned at 26Hz for the best transient response possible at this volume!
It has -1db at 40hz, -3db at 33hz, -12db at 20hz!
The group delay is also nice: 14,2ms@30hz 8,7ms@40hz 5,6ms@50hz!

Are there better woofers than this one in the same price range?

Thanks!
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Old 17th December 2005, 03:04 PM   #2
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Help!
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Old 18th December 2005, 12:48 AM   #3
chrish is offline chrish  Australia
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Not the poly cone, but the same size treated paper cone from Vifa is in this design:

http://murphyblaster.com/content.php...ifa_Tower.html

I have just finished gluing up the cabinets on this design and dropped the drivers in to see how it sounds. I am actually quite impressed. The mid range is not quite as detailed as my Lynn Olson Ariels, but then again the design cost less than half as much. The bass extension, however, is actually a little better.

Hope this helps,

Chris
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Old 24th December 2005, 03:59 PM   #4
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Does anyone have some measurements?
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Old 25th December 2005, 06:55 PM   #5
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loudspeaker evaluation

Here is a good evaluation that includes this driver. Scroll down to summary and conclusions if you want to skip all the test results. You'll see that the peerless driver one ups the vifa. The p21 seems to be a well respected driver and I've heard it in some really pricey Dunlavys but I believe it has been around for a while and for the money you can do better.

If your making a two way I think you will probably find designs out there with better combinations and in some cases lower prices. Try www.murphyblaster.com. The mbow and its lower cost variations would probably be awesome and you can always build the three way if you want more bass. Also search modula MT, Bob Brines tl with peerless, or look on this site for the diyaudio reference project. Lots more but those are the ones that came to mind.

I like the MBOW and the Modula mt or mtm. Tough to beat those dayton rs drivers as long as you use them right.
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Old 26th December 2005, 12:23 AM   #6
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I've heard the P21 in a 2-way kit many (20!) years ago.
It's a very good, but older generation polycone and as such is a little too soft and polite from the bass to the midrange. You lose a little detail and transparency in the mids, but it still sounds good in a polite kind of way. Generally I like polycones but I wouldn't use anything bigger than 5" in the midrange.
I think there are better poly/paper or nextel drivers to choose from.
If you really want poly check out the Dynaudios on Ebay.
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Old 26th December 2005, 04:18 PM   #7
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First I want to thank you for your responses!

kifeinthesink, you said that I could find something better for the money!
Since I want to build a 2-way floorstander crossed as low as possible (1.2k-1.5k), I'm searching for a good 8", and I want to find the best
for the money!

!!!!Any opinions for something better?!!!!(I really need opinions)


The P21 that is tested on the linkwitz site is an old one P21WO-20-08
and I don't think it coresponds with the P21WO-39-08!

David Gatti, I bet you heard the P21WO-20-08!
I don't want to use a polycone, but this is the best 8" speaker that I could find for my project, until now!
on ebay I couldn't find many dynaudio speakers:
http://search.ebay.com/dynaudio_W0QQfromZR40

Here's the project that I want to build:
clock upgrade for cd/dvd players

I really need your support to find a good 8", and a tweeter for it!
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Old 26th December 2005, 09:47 PM   #8
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I'm sure you're correct Alex, and the latest version may have improved in those areas.
You may also want to consider the Peerless 830884 or 830869, or if funds permit, the 7" Scanspeaks.
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Old 27th December 2005, 07:41 AM   #9
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My mistake. I didn't notice the different numbers.

Have you looked at the Dayton rs drivers?

If you dont mind going with a 7 inch driver the rs180 is tough to beat for the money and the seas 27tdfc seems to be one of the best choices for a xo as low as your looking for. Look at the modula mt if you haven't already. Its pretty much what your decribing.

Look here for some more excellent driver tests.
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Old 27th December 2005, 07:46 PM   #10
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Thanks for your replies David Gatti and kifeinthesink!
David, I checked those Peerless drivers, but they don't compare with the Vifa in terms of FR in a 50L BR box. The 830884 is better, but it is still under the Vifa(I don't like polycones, but this driver has some good graphs)!
Maybe the sound is better! Have you heard it?

I don't have money for that SS, I can afford maximum 80$ for the
woofer(I'll have to pay 40-50% more for taxes and transport)
and even so I would preffer an 8" due to grater bass!

kifeinthesink, I'm now checking that Dayton RS, it has a good price but does it have what it takes to beat a 60-80$ 8" woofer?

I would like to use an 8", crossed as low as possible 1,2-1,5khz
with a tweeter+waveguide!

Any other opinions for an 8" woofer to beat this Vifa:
WinISD shows a nice response in a 50Liters enclosure tuned at 26Hz for the best transient response possible at this volume!
It has -1db at 40hz, -3db at 33hz, -12db at 20hz!
The group delay is also nice: 14,2ms@30hz 8,7ms@40hz 5,6ms@50hz!
???
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