Vifa M18WO-09-08 Revisited - diyAudio
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Old 22nd September 2013, 11:07 AM   #1
ODougbo is offline ODougbo  United States
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Post Vifa M18WO-09-08 Revisited

Not much on DIY about the old, but popular Vifa woofer, and thought this might be good Intel someday. Also looking to upgrade my existing boxes, which are now 1"mdf, and going to use BB with Bass Wood front edge. Which is one of the up-grades, because it can be rounded over. Hopefully the BB ply will add some energy, i.e. last time I used them, I thought they lacked luster.

Lost the schematic for the xo, but think I got it down on paper okay. Will be replacing the tweeter resistors with MS, Mundorf resistors. The xo design is MS leap design, I'm pretty sure MS sold hundreds of these, selling them basically as a kit.

Woofer: Vifa M18WO-09-08 Speaker Loudspeaker Woofer
(could not find Vifa Spec Sheet)
Tweeter, the famed MDT 30, very nice, but always thought was missing the high-top end. However going to re-use them.

Flare port, DIY method, with ring on inside (sample shown).

Using WinISD and box wizard, for volume and port length. Going to use .65 -.7 net volume.

Open for ideas how to upgrade??


Tip of the day: Apply ArmorAll to rubber surrounds, it helps preserve them. Evey few years is all that is needed; only need a few drops, apply with small brush, etc.
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File Type: jpg DSC03330.JPG (279.9 KB, 219 views)
File Type: jpg 1 Morel Vifa.jpg (30.4 KB, 211 views)

Last edited by ODougbo; 22nd September 2013 at 12:40 PM.
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Old 23rd September 2013, 11:32 PM   #2
ODougbo is offline ODougbo  United States
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Need to post pic of this little trick. I was way, way too old before someone showed me.
Need to cut 45s? but never works liked planed; here's an alternate:

Use table saw like a shaper, cut panels to exact size (square edges) and cut as shown in pics.

Look out for the small pieces shooting back, although these just "walked out" slowly.
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Old 25th September 2013, 09:16 AM   #3
ODougbo is offline ODougbo  United States
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Mockup baffle pic, guess work only, when we built these there was no mention of baffle diffraction. Center-to-Center is now 6" vs. 7" black mfd boxes.

Problem with the mdf boxes: it was sometimes hard to hear movie dialogue, no matter how many times played back. There was no problem in the bass department with the old boxes, unless that what was causing the other issues. (too much bass).

Ports: could use one large 2" - going to use two smaller 1-1/4" pvc, which works out to the same length - 6.5" long (x2). They will be mounted high on back panel.
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Old 28th September 2013, 01:50 PM   #4
ODougbo is offline ODougbo  United States
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Box is now .80cf - double barrel ports as mentioned.
Glued, front/back and center brace up 1st, which will help with final assembly.
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Old 28th September 2013, 10:19 PM   #5
ODougbo is offline ODougbo  United States
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I like the bass wood front edge, easier to sand than the plywood, which helps with sanding a smooth edge.
Put felt in the hard to reach places, but not done, more felt and finishing left.
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Old 1st October 2013, 12:15 PM   #6
ODougbo is offline ODougbo  United States
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Still like this idea of professional looking gaskets.

Picked this material at auto parts store; with a little planing can use cut-out for tweeter.

I found the best way is to router cut center hole first, then trim around speaker with razor knife.
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Last edited by ODougbo; 1st October 2013 at 12:24 PM.
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Old 1st October 2013, 05:00 PM   #7
sreten is offline sreten  United Kingdom
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Hi,

The left inductor should be laid flat, as it looks
intended to be, or rotated ninety degrees.

rgds, sreten.
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Old 1st October 2013, 06:56 PM   #8
ODougbo is offline ODougbo  United States
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Thanks - I'll do that.
Finished one, sounds nice, impressive bass.
Only changed one resistor, the 3.5 wire wound, now a mundorf 3.3ohm.
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Old 1st October 2013, 09:40 PM   #9
ODougbo is offline ODougbo  United States
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Calling this one a success, they never sounded this good, night and day difference really. Changed several things, so don't really know what happened, maybe the combination of all of them.

If I only new then what I know now....would have rebuilt them about 20 years ago.

Like the Minwax spar varnish, deep amber color, deeper than regular poly. Simply sprayed two light coats on these.

Minwax 43205 Helmsman Spar Urethane Clear Satin, Pint - Amazon.com
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Old 3rd October 2013, 10:00 AM   #10
ODougbo is offline ODougbo  United States
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The old switcheroo.

Will use bass mounting screws this time around.
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