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Vifa OX20SC00-04 3/4" Fabric Dome Tweeter
Is the Le value listed for this tweeter, of 4.1 mH possibly a misprint? That would be the value expected for a woofer. The other Vifa tweeters have Le values of around 0.01 mH, over 2 orders of magnitude lower!
Yes this is a misprint. The Le is too low to even register when measured at 10kHz on the WT3, so I cannot even provide a number for you unfortunately.
Date published: 2014-12-31
Break in? How long?
Anyone have experience with break-in on this speaker? out of the box, they are sounding pretty harsh/screechy (particular example is violins at beginning of Ray Charles/Willie Nelson version of "it was a wonderful year"). Will this subside and if so, how many hours of operation are necessary?
All speakers have a different break in period. Tweeters generally have a longer break in simply because they do not move nearly as much as a woofer. I would let it play at a moderate level for 10-20 hours with normal music. A crossover point that is too low or a sensitivity is too high, this will cause distortions and harshness as well.
Date published: 2013-02-27
How exactly would you mount these? Do they come with any sort of mounting hardware? I'm planning on these going in the A-Pillars of my vehicle.
If I'm not mistaken, Vifa has a couple of different mounting rings or "face plates" for these things. Check with PE for availability. I've actually mounted similar drivers by making mounting plates out of wood, shaping the opening into a shallow horn, and sizing the board to fit a 4" x 6" dashboard cutout. I mounted a 3" mid driver alongside the tweeter. It made a neat custom install and was not visible behind the factory grilles.
Date published: 2012-07-20
Can I use these with Dayton RS180-4
I have an auto application with very limited space. I need a tweeter with maximum 1.3" overall diameter.I want to pair these with Dayton RS180-4 with a Dayton 2nd order 2000kHz 2way crossover.Will this setup be ok or should I look elsewhere?
This setup probably won't work very well with the tweeter. This is a small tweeter with a low power handling and high Fs, so by crossing it over that low and with a slope of only 12dB/octave, the tweeter will be getting too much low frequency content, and the tweeter's resonance will probably be quite audible. I'd say that if you're going to cross over at 2kHz then you'll want a 4th-order slope on the tweeter, although that still might not be enough. 4th-order 3kHz or 2nd-order 4kHz would probably be better.Then again, if you're going to use the RS180 then crossing over at anything above 2kHz simply won't work due to the RS180's metal cone breakups around 4kHz.I'd say use this tweeter (since it is quite a good quality tweeter, and it's small enough for your application), but cross it over above 3kHz, and use a different woofer instead. Most paper-cone and poly-cone woofers can be crossed over at 3kHz or even higher. I understand why you'd want to use the RS180 (since it is quite an awesome woofer, esp at its price!), but it's really only meant for 3-way systems, or 2-ways with a low crossover point (and hence a large tweeter).Good luck with your project!
Date published: 2011-10-26
Does this tweeter need a crossover of some sort? It is a car application.The tweeter taken out had a 3.3 mfd cap.
Yes, always. You might get away with a first order (capacitor) at around 3khz. You would need a higher-order if you cross it any lower.
Date published: 2011-08-30