World-Designs-Forum  

Go Back   World-Designs-Forum > World Designs > WD Loudspeakers
Register FAQ Members List Calendar Gallery Today's Posts Search Today's Posts Mark Forums Read

WD Loudspeakers For discussion of World Designs Loudspeakers

Reply
 
Thread Tools Display Modes
  #1  
Old 28th January 2015, 09:45 AM
VantheMan VantheMan is offline
Senior Member
 
Join Date: Jul 2007
Location: Canaries
Posts: 207
Default Playing with crossover values

I was reading Peterīs article "The Next Step" , as published in Hi-Fi World regarding the definitive crossover for the WD25TEX speakers and I was struck by a line encouraging builders to experiment with the value of the resistor used in series with the tweeter inductor in that circuit so as to adjust what he called the transfer curve (Gawd knows ) of the Millennium tweeter.
Just wondered of anyone had done this; he mentions raising its value ( 2.2R) by as little as 0.5R to give a touch more warmth and vice versa ?
What wattage value for the resistor should I get ? any recommendations as to make ?
Reply With Quote
  #2  
Old 28th January 2015, 10:13 AM
John Caswell John Caswell is offline
Super Moderator
 
Join Date: Dec 2005
Location: Wokingham, Berkshire
Posts: 1,397
Default Re: Playing with crossover values

Hi,
I would suggest 5-10Watts as it is HF.
Make - goodness there are so many that others think are the greatest since sliced bread. I would try bog standard Welwyn green vitreous types initially as they are cheap or the square VTM types.
If you can get hold it then a 5-22R variable resistor fitted in place of the existing R and adjusted to your liking will allow you to experiment to your hearts delight. You then measure it and replace with a fixed type.

John
Reply With Quote
  #3  
Old 28th January 2015, 10:17 AM
bob orbell bob orbell is offline
Senior Member
 
Join Date: Nov 2009
Location: kettering northants.
Posts: 1,450
Default Re: Playing with crossover values

Hi Van, you have answered your own question here, buy making the resistor value larger, ie lets say 2.9R, the tweeter will receive less volts and will sound warmer, now if you change the resistor to, lets say 1.5R, the tweeter will now receive more volts and will sound brighter, it is all subject to your room and your personal taste. As for the wattage, if you change it must be the same as the one you remove.BOB
Reply With Quote
  #4  
Old 28th January 2015, 10:30 AM
VantheMan VantheMan is offline
Senior Member
 
Join Date: Jul 2007
Location: Canaries
Posts: 207
Default Re: Playing with crossover values

Thanks Gents, Iīll start looking for some variable jobbies. Sounds logical.
Reply With Quote
  #5  
Old 28th January 2015, 01:07 PM
Richard Richard is offline
Super Moderator
 
Join Date: Dec 2005
Location: Notts
Posts: 4,500
Default Re: Playing with crossover values

Hi Van, all,

Here's the article for anyone following,

http://www.hi-fiworld.co.uk/loudspea...next-step.html

I hope it's ok with Petercom and HFW to show the xover below (Ctrl and scroll to see it bigger),




The resistor is R5 and inductor is L2.

(L2 is given as DCR 0.9 ohms so check if your inductors weren't supplied by WD and take the total value into account when adjusting R5.)

You may find a suitable variable resistor otherwise get suitable values of wirewounds from Maplin.

I'd get 2 x 1 ohms (W1R is Maplins 3W or L1R is 7W). Change out the 2.2R for them for 1R or add them in series with the 2.2R to make 3.2R depending on which way you're looking to go and see if you can hear a difference. If you can then fine tune from there
__________________
'
Reply With Quote
  #6  
Old 28th January 2015, 01:53 PM
VantheMan VantheMan is offline
Senior Member
 
Join Date: Jul 2007
Location: Canaries
Posts: 207
Default Re: Playing with crossover values

Nice one, Richard. Even I can understand that.
Reply With Quote
  #7  
Old 28th January 2015, 02:17 PM
Phil Y's Avatar
Phil Y Phil Y is offline
Senior Member
 
Join Date: Jul 2006
Location: Bristol, UK
Posts: 576
Default Re: Playing with crossover values

Once you have settled on a value you like, you could try Mills Resistors. I have found them to sound a lot better than "standard" wire wounds but as John says, there are many others as well.

Phil.
__________________
Commission for Dark Skies (CfDS)
Reply With Quote
  #8  
Old 28th January 2015, 09:19 PM
VantheMan VantheMan is offline
Senior Member
 
Join Date: Jul 2007
Location: Canaries
Posts: 207
Default Re: Playing with crossover values

Thanks Phil, I had thought of Mills but some say yes and some say why ?
What about the Soniqs caps in the original kit ? Any experience there ?

Cheers,
Chris
Reply With Quote
  #9  
Old 28th January 2015, 10:34 PM
Greg.'s Avatar
Greg. Greg. is offline
Senior Member
 
Join Date: Dec 2005
Location: Bristol, UK
Posts: 2,992
Default Re: Playing with crossover values

Although I have fitted Soniqs capacitors for others in their kit, I have no long time experience of sound and how it changes as they burn in. I do however very much like Mills resistors, use them in my current KLS3 crossovers and would wholeheartedly recommend them. Wire wound and non-inductive, what's to go wrong! To me they sound great!
Reply With Quote
  #10  
Old 28th January 2015, 11:00 PM
Phil Y's Avatar
Phil Y Phil Y is offline
Senior Member
 
Join Date: Jul 2006
Location: Bristol, UK
Posts: 576
Default Re: Playing with crossover values

Hello Chris,

Sorry, I have no experience of the Soniqs caps although several people on here seem to like them. I have become a bit of a Mundorf fan the last couple of years. There are so many makes these days you can't really try them all !

Regards, Phil.
__________________
Commission for Dark Skies (CfDS)
Reply With Quote
Reply

Thread Tools
Display Modes

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
Forum Jump


All times are GMT +1. The time now is 03:53 PM.


Powered by vBulletin® Version 3.7.3
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright World Designs