WTW (W26s with 45" ribbon) web page with PICs

Paul W · 5th July 2005, 01:49 PM

My new project page is up and running so I hope you enjoy the story of this latest journey.

The WTW was about 10 months in the making...most of that time was spent with the mid-tweet (1"x45" true ribbon). The baffles took just a few weekends to build.

(Apologies to those from the Mad board who had trouble with Geocities bandwidth...I've reduced image size to improve accessibility.)

WTW web page

Audiophilenoob · 5th July 2005, 01:57 PM

Quote:

Originally posted by Paul W
My new project page is up and running so I hope you enjoy the story of this latest journey.

The WTW was about 10 months in the making...most of that time was spent with the mid-tweet (1"x45" true ribbon). The baffles took just a few weekends to build.

(Apologies to those from the Mad board who had trouble with Geocities bandwidth...I've reduced image size to improve accessibility.)

WTW web page

is there any problems with midbass location?
Meaning any comb filtering problems having midbasses that far apart

Paul W · 5th July 2005, 10:39 PM

The first null/dip within the woofer passband begins around 13 degrees off the vertical listening axis, and then moves lower in frequency as the angle increases. With a pink noise source, at normal listening distance, I cannot hear it moving my head from the floor, through on-axis, to standing.

Moving vertically like that, the dominate effect is the increase in higher frequencies as you approach listening height. Same result with a 1/6 octave RTA...midrange and top end slowly roll off above and below listening axis but little variation in the upper bass/low mid.

Someone here has asked similar/related questions...so here is a link to some really great freeware from the guys at the FRD Consortium. From them, I used BDS, ARPE, and VPR on this project. Try the 2D version of VPR first.

FRD Consortium

HeatMiser · 5th July 2005, 11:09 PM

Congratulations, those are lovely and seem to have been a great success all around.

Audiophilenoob · 6th July 2005, 12:50 AM

Where are those Seas LP'd at?

Taco · 6th July 2005, 07:24 PM

Wow, very nice engineering!! Not everyone can work with FEM.

Audiophilenoob · 6th July 2005, 08:37 PM

Quote:

Originally posted by Taco
Wow, very nice engineering!! Not everyone can work with FEM.

FEMM's quite easy ... just need a little trial and error

Paul W · 6th July 2005, 10:42 PM

Noob...LR4 ~600Hz

Miser, Taco...thanks...very satisfied for now...hope I feel the same a year from now

Audiophilenoob · 7th July 2005, 01:32 AM

Quote:

Originally posted by Paul W
Noob...LR4 ~600Hz

Miser, Taco...thanks...very satisfied for now...hope I feel the same a year from now

wow... 600 hz seems pretty high... any blending problems?

Paul W · 7th July 2005, 03:02 PM

Agree, 600Hz is high for most 10". The W26 is designed like an overgrown W22 with copper shorting rings for low distortion, plus a very stiff cone with high breakup. Except off-axis, I think the 26 could go close to 1K...so blending isn't an issue. The ribbon is delayed 0.27ms which also helps on-axis integration.

5th July 2005, 01:49 PM	#1
Paul W diyAudio Member Join Date: Oct 2003 Location: North Georgia	WTW (W26s with 45" ribbon) web page with PICs My new project page is up and running so I hope you enjoy the story of this latest journey. The WTW was about 10 months in the making...most of that time was spent with the mid-tweet (1"x45" true ribbon). The baffles took just a few weekends to build. (Apologies to those from the Mad board who had trouble with Geocities bandwidth...I've reduced image size to improve accessibility.) WTW web page

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5th July 2005, 10:39 PM	#3
Paul W diyAudio Member Join Date: Oct 2003 Location: North Georgia	The first null/dip within the woofer passband begins around 13 degrees off the vertical listening axis, and then moves lower in frequency as the angle increases. With a pink noise source, at normal listening distance, I cannot hear it moving my head from the floor, through on-axis, to standing. Moving vertically like that, the dominate effect is the increase in higher frequencies as you approach listening height. Same result with a 1/6 octave RTA...midrange and top end slowly roll off above and below listening axis but little variation in the upper bass/low mid. Someone here has asked similar/related questions...so here is a link to some really great freeware from the guys at the FRD Consortium. From them, I used BDS, ARPE, and VPR on this project. Try the 2D version of VPR first. FRD Consortium

5th July 2005, 11:09 PM	#4
HeatMiser diyAudio Member Join Date: May 2003 Location: Washington State, USA	Congratulations, those are lovely and seem to have been a great success all around.

6th July 2005, 12:50 AM	#5
Audiophilenoob diyAudio Member Join Date: May 2005 Location: NC	Where are those Seas LP'd at?

6th July 2005, 07:24 PM	#6
Taco diyAudio Member Join Date: Nov 2002 Location: Place in the Netherlands	Wow, very nice engineering!! Not everyone can work with FEM.

6th July 2005, 10:42 PM	#8
Paul W diyAudio Member Join Date: Oct 2003 Location: North Georgia	Noob...LR4 ~600Hz Miser, Taco...thanks...very satisfied for now...hope I feel the same a year from now

7th July 2005, 03:02 PM	#10
Paul W diyAudio Member Join Date: Oct 2003 Location: North Georgia	Agree, 600Hz is high for most 10". The W26 is designed like an overgrown W22 with copper shorting rings for low distortion, plus a very stiff cone with high breakup. Except off-axis, I think the 26 could go close to 1K...so blending isn't an issue. The ribbon is delayed 0.27ms which also helps on-axis integration.