Sloped Mid-bass'

Ed LaFontaine · 31st December 2005, 12:45 PM

Sloped as in the Wilsons or Focals.

I think the benefit relates to a more consistent radiation pattern...less comb filtering...a wider sound field.

Are there links to discussion on this topic? I wonder why these and other manufacturers do this. I want to include this in my speakers if it is a genuine improvement.

Ultima Thule · 31st December 2005, 07:33 PM

Hi Ed!

Not sure what you mean with sloped baffle, not stepped baffle or, no? Some elements are angeled or?
Perhaps any model of either brands you mentioned?

How is your tweeter waveguide project forwarding?

Cheers Michael

Ed LaFontaine · 1st January 2006, 03:43 AM

The Wilson Maxx is one example of a speaker with the M's sloped with respect to each other.

http://www.wilsonaudio.com/products/maxx/drawing.shtml

Ed LaFontaine · 1st January 2006, 03:50 AM

The JMLab Grande Utopia is another.

http://www.stereophile.com/images/ar...t/gubepic1.jpg

Ed LaFontaine · 1st January 2006, 03:57 AM

The tweeter waveguide project is gaining momentum. The Seas H1212 has been chosen for prototypes. Several will be made for measurements. Results of measurements will be used to do more test guides until one is found suitable to build into a speaker.

Other tweeters will be considered and results will be posted.

Thanks for your interest, Michael.

Sidenote: My selection of Wilson & JMlab are as examples only. I've only heard one of them briefly. I'd like to understand the theory and use it, possibly.

GM · 1st January 2006, 05:28 AM

Greets!

It's about aligning their acoustic centers at the XO point to ~preserve the signal's phase response: http://www.silcom.com/~aludwig/Louds...Time_alignment

GM

GM · 1st January 2006, 05:38 AM

Just remembered this one: http://www.rane.com/note160.html

Ed LaFontaine · 1st January 2006, 11:58 AM

GM, Thanks for the links. Both are valuable and address topics I'm interested in here. It will take awhile for me to wrap my head around them. Good stuff.

It appears that I have 2 issues (or more).

Time alignment will be affected by the depth of a waveguide. I think that is easier to understand than the second.

Manipulation of lobing to increase (broaden) the sweet spot. At this point I can only imagine it necessary to measure driver arrangements to optimize.

GM · 1st January 2006, 12:44 PM

Greets!

You're welcome! Here's a bit more technical one to enlighten/confuse and addresses the MTM layout: http://www.birotechnology.com/articles/VSTWLA.html

GM

Ed LaFontaine · 1st January 2006, 01:00 PM

Ouch! Make Mongo's eyes cross! Make noggin' hurt!

I've printed that last one for reference at the bedstead.

31st December 2005, 12:45 PM	#1
Ed LaFontaine ...truth seeker... diyAudio Member Join Date: Feb 2004 Location: where the Appalachians rise from the Blue Grass	Sloped Mid-bass' Sloped as in the Wilsons or Focals. I think the benefit relates to a more consistent radiation pattern...less comb filtering...a wider sound field. Are there links to discussion on this topic? I wonder why these and other manufacturers do this. I want to include this in my speakers if it is a genuine improvement. __________________ ...call me Ed...Special Ed... EnABL kit http://www.diyaudio.com/forums/swap-meet/119852-enabl-kit.html DCB1 parts http://www.diyaudio.com/forums/swap-...ml#post2361098

31st December 2005, 07:33 PM	#2
Ultima Thule diyAudio Member Join Date: Jan 2004 Location: Koskenkorva Land	Hi Ed! Not sure what you mean with sloped baffle, not stepped baffle or, no? Some elements are angeled or? Perhaps any model of either brands you mentioned? How is your tweeter waveguide project forwarding? Cheers Michael __________________ "If transistors are blueberries and FETs are strawberries, then tubes must be.. pears" Michael 29th January 2010

1st January 2006, 03:43 AM	#3
Ed LaFontaine ...truth seeker... diyAudio Member Join Date: Feb 2004 Location: where the Appalachians rise from the Blue Grass	The Wilson Maxx is one example of a speaker with the M's sloped with respect to each other. http://www.wilsonaudio.com/products/maxx/drawing.shtml __________________ ...call me Ed...Special Ed... EnABL kit http://www.diyaudio.com/forums/swap-meet/119852-enabl-kit.html DCB1 parts http://www.diyaudio.com/forums/swap-...ml#post2361098

1st January 2006, 03:50 AM	#4
Ed LaFontaine ...truth seeker... diyAudio Member Join Date: Feb 2004 Location: where the Appalachians rise from the Blue Grass	The JMLab Grande Utopia is another. http://www.stereophile.com/images/ar...t/gubepic1.jpg __________________ ...call me Ed...Special Ed... EnABL kit http://www.diyaudio.com/forums/swap-meet/119852-enabl-kit.html DCB1 parts http://www.diyaudio.com/forums/swap-...ml#post2361098

1st January 2006, 03:57 AM	#5
Ed LaFontaine ...truth seeker... diyAudio Member Join Date: Feb 2004 Location: where the Appalachians rise from the Blue Grass	The tweeter waveguide project is gaining momentum. The Seas H1212 has been chosen for prototypes. Several will be made for measurements. Results of measurements will be used to do more test guides until one is found suitable to build into a speaker. Other tweeters will be considered and results will be posted. Thanks for your interest, Michael. Sidenote: My selection of Wilson & JMlab are as examples only. I've only heard one of them briefly. I'd like to understand the theory and use it, possibly. __________________ ...call me Ed...Special Ed... EnABL kit http://www.diyaudio.com/forums/swap-meet/119852-enabl-kit.html DCB1 parts http://www.diyaudio.com/forums/swap-...ml#post2361098


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1st January 2006, 05:28 AM	#6
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Greets! It's about aligning their acoustic centers at the XO point to ~preserve the signal's phase response: http://www.silcom.com/~aludwig/Louds...Time_alignment GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

1st January 2006, 05:38 AM	#7
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Just remembered this one: http://www.rane.com/note160.html __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

1st January 2006, 11:58 AM	#8
Ed LaFontaine ...truth seeker... diyAudio Member Join Date: Feb 2004 Location: where the Appalachians rise from the Blue Grass	GM, Thanks for the links. Both are valuable and address topics I'm interested in here. It will take awhile for me to wrap my head around them. Good stuff. It appears that I have 2 issues (or more). Time alignment will be affected by the depth of a waveguide. I think that is easier to understand than the second. Manipulation of lobing to increase (broaden) the sweet spot. At this point I can only imagine it necessary to measure driver arrangements to optimize. __________________ ...call me Ed...Special Ed... EnABL kit http://www.diyaudio.com/forums/swap-meet/119852-enabl-kit.html DCB1 parts http://www.diyaudio.com/forums/swap-...ml#post2361098

1st January 2006, 12:44 PM	#9
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Greets! You're welcome! Here's a bit more technical one to enlighten/confuse and addresses the MTM layout: http://www.birotechnology.com/articles/VSTWLA.html GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

1st January 2006, 01:00 PM	#10
Ed LaFontaine ...truth seeker... diyAudio Member Join Date: Feb 2004 Location: where the Appalachians rise from the Blue Grass	Ouch! Make Mongo's eyes cross! Make noggin' hurt! I've printed that last one for reference at the bedstead. __________________ ...call me Ed...Special Ed... EnABL kit http://www.diyaudio.com/forums/swap-meet/119852-enabl-kit.html DCB1 parts http://www.diyaudio.com/forums/swap-...ml#post2361098

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