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.
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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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.
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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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.
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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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.
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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Hi,
The left inductor should be laid flat, as it looks
intended to be, or rotated ninety degrees.
rgds, sreten.
The left inductor should be laid flat, as it looks
intended to be, or rotated ninety degrees.
rgds, sreten.
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.
Finished one, sounds nice, impressive bass.
Only changed one resistor, the 3.5 wire wound, now a mundorf 3.3ohm.
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
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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I've been holding on to one last woofer for a while now, but found a survivor in a mdf box over at my buddy garage 😀
Tossed out the mdf box and made a second pair from parts on the shelf/bench.
The 1st pic is one box from each pair, the smaller pair was built from SR71 plans, no particular reason really.
Again only had one xo board from a design from MS years ago and just DIY-ed a second board on scrap wood and a hot glue gun.
I did measure all 4 boxes, don't know why they don't look a little better, maybe this was good enough for back then.
Maybe the Morel (28's and 30's) tweeters need a ferrofluid oil change?
Tossed out the mdf box and made a second pair from parts on the shelf/bench.
The 1st pic is one box from each pair, the smaller pair was built from SR71 plans, no particular reason really.
Again only had one xo board from a design from MS years ago and just DIY-ed a second board on scrap wood and a hot glue gun.
I did measure all 4 boxes, don't know why they don't look a little better, maybe this was good enough for back then.
Maybe the Morel (28's and 30's) tweeters need a ferrofluid oil change?
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