1st order xover question - Page 4 - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 29th September 2013, 02:45 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
  Reply With Quote
Old 29th September 2013, 05:12 AM   #32
Jay is offline Jay  Indonesia
diyAudio Member
 
Join Date: Feb 2003
Location: Jakarta
Quote:
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
  Reply With Quote
Old 1st October 2013, 12:32 AM   #33
diyAudio Member
 
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.
Thanks!
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
2nd order or 1st with notch, that is the question Bill poster Multi-Way 22 24th August 2013 11:36 AM
1st order Passive Line Level Crossover + 2nd order Highpass? alexclaber Multi-Way 11 4th January 2008 08:15 PM
deceptive perception ? 1st order-2nd order question poldus Multi-Way 4 11th April 2007 12:58 AM
2nd Order Xover question johninCR Multi-Way 7 10th August 2004 09:15 AM
1st Order Tweeter, 3rd Order Woofer? Jay Multi-Way 8 8th May 2004 10:29 PM


New To Site? Need Help?

All times are GMT. The time now is 09:01 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2