Mark's proto 6.5" Woofer, 1" silk Tweet combo - Page 6 - diyAudio
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Old 8th January 2010, 03:55 AM   #51
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Hi Guys,
Here's the pic of the latest version of the woofer. The T/S, Frequency and Impedance data was posted just before Christmas (24 Dec.) on this thread.

A few changes:

1 - Minor cone modification to further flatten the response and a change of colour from white to black.
2 - Front suspension modification, mainly to do with extending durability.
3 - 4 layer coil (already mentioned in the 24 Dec.) post.
4 - Front looks improved. Together with the Hex screws (these come with the drivers), the seal is also improved. The idea being to give the driver a "pro" look if you chose to front mount the unit.

Hope you like it!

Cheers

Mark.
Attached Images
File Type: jpg Woof6_2b.jpg (68.9 KB, 526 views)
File Type: jpg woof_6.5_3.jpg (53.0 KB, 516 views)
File Type: jpg installation-1.jpg (15.0 KB, 497 views)

Last edited by markaudio; 8th January 2010 at 06:39 AM.
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Old 8th January 2010, 04:21 AM   #52
gooki is offline gooki  New Zealand
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Looks good.
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Old 8th January 2010, 11:43 AM   #53
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exactly my taste, simple but great Design and it looks noble!
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Old 8th January 2010, 07:02 PM   #54
gfiandy is offline gfiandy  United Kingdom
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Hi Mark,

I was doing a few quick simulations with your driver data and it looks good for a box of about 14L with a mild peak in the bass for both a closed box and a vented box. However one thing that would help with the simulations would be the hight of the voice coil and the hight of the gap. Is this data available?

Also how were your graphs obtained are they 2Pi or on IEC baffle (or some other method) ?

Many thanks,
Andrew
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Old 11th January 2010, 04:03 AM   #55
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Hi Andy,
Yep, the likely volumes will be 14 to 22 litres depending on the trade-offs between range and power handing.

I think you need the Xmax (1 way) = 5.75-mm

Testing is anechoic in chamber, LMS-v4 on IEC baffle

Thanks

Mark.
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Old 11th January 2010, 06:55 AM   #56
DcibeL is offline DcibeL  Canada
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Looking good Mark, I really like the changes where the frame meets the surround! I think I liked the white cone better, but that's probably just me.

Nice and healthy xmax too...
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Last edited by DcibeL; 11th January 2010 at 07:03 AM.
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Old 11th January 2010, 04:32 PM   #57
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Hi Dcibel,
Many thanks for your encouragement.

Ummmph, I quite like the white cone also. But the general comment is its gotta B "Black". I guess its a "man" thing. Wonder if we can attract some nice ladies into the hobby?

Cracking good comment on Amp hum! I wonder if I can teach my 300B to sing in harmony?

Cheers

Mark.
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Old 11th January 2010, 05:05 PM   #58
tresch is offline tresch  United States
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I'm also down with the white cone. Something different!

then again I like the black one, too...

Maybe an option in the future?
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Old 11th January 2010, 11:18 PM   #59
gfiandy is offline gfiandy  United Kingdom
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Hi Mark,

As an exercise, I did some simulations using the FRD tools of the effect on freq response of a IEC baffle.

The frequency response disturbance between 1K and 2K could be diffractions from the edge of the baffle and possibley the dip at 650Hz. Depending on the exact size and placement of the driver in the baffle.

I assumed the dimensions from the FRD web site -
135,165cm rectangle 22.5 and 15cm offset from center.

It matches more closely if you didn't quite get the offset right. However that could just be a simulation error. See JPG.

Thought you might be interested as you don't want to try to engineer out a frequency disturbance that is a diffraction error.

Regards,
Andrew
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File Type: jpg IEC Baffle Diffraction.JPG (271.3 KB, 393 views)
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Old 11th January 2010, 11:25 PM   #60
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Quote:
Originally Posted by tresch View Post
I'm also down with the white cone. Something different!
I like white paper cones tooo... i can make them any colour i want when i go at them

dave
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