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Old 29th September 2013, 01:45 AM   #31
diyAudio Member
Join Date: Nov 2008
I am using the Accuton 3/4" diamond tweeter.
Every sim I did used a higher value cap, 3.6 etc., plus an inductor for a second order crossover.
After finding ALL the x-overs left a distorted sound in the tweeter, I started from scratch.
Final 1st order crossover, 1.5uF. 2.0uF sounds about right.

The lunatic
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Old 29th September 2013, 04:12 AM   #32
Jay is offline Jay  Indonesia
diyAudio Member
Join Date: Feb 2003
Location: Jakarta
Originally Posted by mjatabor View Post

If I go the route of the Vifa d19, which is a drop in w/o cabinet modification, I should consider at least a 2nd order xover.

There is no way for me to do any impedance measuring so it will be hit or miss w/ an online calculator.

Or maybe just purchase a phenolic ring tweeter, which I've read is a slight improvement of stock cone tweeters w/o any crossover mod other than a new poly cap.

What you say?
When you choose to get the benefit of running the woofer fullrange, you should be ready for the compromises. The benefit of the fullrange is the sonic quality and often the midrange (vocal, soundstage) quality. So what is the compromise? Believe me, even if you measure the drivers, there's no way you can get close to perfect blend of the drivers.

If you choose to run extra filter for the woofer, you have to measure the driver, you cannot do this with calculator because the calculator doesn't take into account the natural roll-off of the woofer.

If you choose to run the woofer fullrange like the original, here is your chance to do it by ears (forget the calculator):

1) Measure the original capacitor (or replace). I have found many old capacitors have reduced capacitance.

2) The Vifa D19 has good highs, but being a small dome it has too good dispersion, the opposite of the large cone woofer. You may get the best axial response but in general listening condition I don't think it is good.

3) The Vifa XT25 likes to be filtered with small cap and it's dispersion matches that of the woofer. I have never tried this but I think XT25 has uncommon phase response where phase is the most critical in this situation. There is a chance tho.

4) Imo and ime, the cone tweeter has the easiest and the best possible integration. I believe that you should try the Visaton (TW-70?) suggested previously. Now how about the value of the capacitor? Forget about calculator here. You are not looking for the correct crossover point but you are looking for the best phase overlap. With first order, the roll-off is far from steep so as far as response is concerned, the value can be anything from 1u5 to 4u7. I think one 2uF plus a few MKPs will do for the experiment. Don't know with you but such capacitors can be found in every trash bins in my house
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Old 30th September 2013, 11:32 PM   #33
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Join Date: Aug 2005
I hear you all. I hooked up the speakers in another system/another room, and they are really quite nice, though not perfect. I hear you about a dome tweeters possible incompatibility w/ a full range 8" woofer in a sealed box.
I'm waiting for my '66 McIntosh MA5100 integrated amp to come back from Terry DeWick's repair. I bought these speakers to use in a system with this amp and a Dual 1019/Shure M91ED. I should just wait see and then decide. In the meantime replacing the 2uf cap with a Solen may be best. If I upgrade I'm leaning on the Phenolic ring cone tweeter as an upgrade to keep the vintage orientation of the system.
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