WTW (W26s with 45" ribbon) web page with PICs - diyAudio
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Old 5th July 2005, 01:49 PM   #1
Paul W is offline Paul W  United States
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Default 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

Click the image to open in full size.
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Old 5th July 2005, 01:57 PM   #2
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Default Re: WTW (W26s with 45" ribbon) web page with PICs

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

Click the image to open in full size.
is there any problems with midbass location?
Meaning any comb filtering problems having midbasses that far apart
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Old 5th July 2005, 10:39 PM   #3
Paul W is offline Paul W  United States
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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
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Old 5th July 2005, 11:09 PM   #4
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Congratulations, those are lovely and seem to have been a great success all around.
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Old 6th July 2005, 12:50 AM   #5
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Where are those Seas LP'd at?
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Old 6th July 2005, 07:24 PM   #6
Taco is offline Taco  Netherlands
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Wow, very nice engineering!! Not everyone can work with FEM.

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Old 6th July 2005, 08:37 PM   #7
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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
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Old 6th July 2005, 10:42 PM   #8
Paul W is offline Paul W  United States
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Noob...LR4 ~600Hz

Miser, Taco...thanks...very satisfied for now...hope I feel the same a year from now
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Old 7th July 2005, 01:32 AM   #9
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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?
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Old 7th July 2005, 03:02 PM   #10
Paul W is offline Paul W  United States
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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.
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