Enclosure size for Vifa M26WR 10" - diyAudio
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Old 20th December 2003, 12:31 AM   #1
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Default Enclosure size for Vifa M26WR 10"

I have a spare Vifa 10"M26WR ( I think that's the model number), I had it in a HUGE enclosure in a three way system that I took apart a while ago. Does anyone know what size sealed enclosure, if any, this will go in? I have a 1 cubic foot enclosure sitting around that I could try.....
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Old 20th December 2003, 02:08 AM   #2
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I don't think Vifa reccomend a sealed enclosure. I haven't ever tried modeling a sealed enclosure for it. I have these woofers in my 3 way, vented about 70L currently (I think), can't remember the tuning freq, I've lost all my design documentation

I think I came up with about 75L vented as a good compromise between size and bass extention for when I redo the cabinets, simulated an f3 of about 36Hz from memory, although I really would like to do better than that, especially since the resonant freq of the woofer is around 28Hz.....

Tony.

edit: Well I went looking for the official vifa spec sheet (I've got a printout somewhere, but it used to be on the web). Didn't find it but did find this: http://users.tpg.com.au/gadget69/M26WR-09-08.jpg Which says suitable for vented or sealed enclosure, so I guess get the modelling prog out and try some stuff out
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Old 20th December 2003, 09:07 AM   #3
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Unfortunately I am currently not lucky enough to have any software, but I am trying really hard to research them all so I don't buy a dud. Can anybody with a good program help me with this? All the speakers' parameters are listed on in that link he gave on the previous post.
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Old 20th December 2003, 11:31 AM   #4
sreten is offline sreten  United Kingdom
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The plot shows two sealed box plots 27L (1cu) and 35L (ideal).

It shoes how forgiving sealed box alignments are, 1cu will be fine.

The other plot shows a reflex 2cu box, port 32Hz.

sreten.
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File Type: gif plot.gif (8.2 KB, 288 views)
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Old 20th December 2003, 12:38 PM   #5
sreten is offline sreten  United Kingdom
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Sorry the reflex was 70L, not 2cu. sreten.
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Old 20th December 2003, 05:13 PM   #6
sreten is offline sreten  United Kingdom
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P.S. The above plot was done with winISD, which is free :

http://www.linearteam.dk/default.aspx?pageid=winisd

there are three different 10"M26WR's in the database.

sreten.
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Old 20th December 2003, 11:50 PM   #7
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Default Heres a couple done with unibox

Note that the T/S params are the ones I measured myself (found the printout yay).... The only significant difference to the published specs was the resonant freq which I measured at 29Hz. (using added mass method with a scale acurate to 0.1g)

Note that the sealed graph was optomised for a Qtc of 0.5

Also note that while the vented graph shows 1db response peak its actually .5db rounded up. Further note that the falling off of response after 200 Hz I would say is an acurate model, as the measurements I did recently with speaker workshop show exactly the same behaviour (only in a 70L vented box) in the real world finished item. Modeling done with a series resistance of 0.5 ohm.

Modelling done with Unixbox (also free) for which the main drawback is you need microsoft excell to use it.

If you would like to see the step response I'll post the comaprison graph from unibox...... I can see why people opt for sealed alignments looking at it!

had to truncate the graphs as resising them completely wrecked the fonts.

Tony.

edit: BTW my T/S params are:
Fs 29.2
Vas 125L
Qms 2.79
Qes .368
Le 1.79
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File Type: gif m26wr_sealed_vented.gif (29.2 KB, 242 views)
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Old 21st December 2003, 06:46 PM   #8
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Wow! Thanks for the great info!! I am actually gonna try it riht now. (and I downloaded that software, too )
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