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Old 30th September 2010, 04:39 PM   #1011
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Quote:
Originally Posted by ichiban View Post

I'm not seeing A graphic here, should there be one?

Also, never got a response to post#1007.
The new XO was referenced on Madisound's forum to this thread at HTGuide forum -- it's on the 5th page:
HTGuide Forum - seas thor crossover redesign help
http://www.htguide.com/forum/attachm...chmentid=10703

D'Appolito designed the original LPF section to deal with the rising response of the paired woofers at around 400Hz, and a resonance at 4.5kHz with a 10dB peak. Perhaps Dave can opine, but the suggestion was made that the peak was dealt with "inadequately". I don't see this to be the case with the original XO's.

The 8 ohm resistor in the impedance matching network of the HP on the new design is too low a value.
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Old 30th September 2010, 04:58 PM   #1012
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I'm totally confused as well...
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Old 30th September 2010, 06:38 PM   #1013
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Jack,

This is on you very wide build of Thor?

dave
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Old 30th September 2010, 07:27 PM   #1014
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Quote:
Originally Posted by planet10 View Post
Jack,

This is on you very wide build of Thor?

dave
The front is 9.5", but bevels at a 30 degree angle. The dimensions were worked out on the MJK Mathcad program.
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Old 30th September 2010, 08:37 PM   #1015
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The end of the bevels will determine the effective width. Being much wider any BSC comp built into the XO will be thrown way off (ie in theory you should get a big hump below about 500 Hz)

dave
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Old 1st October 2010, 09:10 PM   #1016
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Quote:
Originally Posted by planet10 View Post
The end of the bevels will determine the effective width. Being much wider any BSC comp built into the XO will be thrown way off (ie in theory you should get a big hump below about 500 Hz)

dave
The original XO from the AX article just used 1mH as an LPF.

Here's a screen dump of the 4.5kHz corrector's effect from the AX article -- it is "inadequate" as suggested:

Click the image to open in full size.

Last edited by jackinnj; 1st October 2010 at 09:12 PM.
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Old 2nd October 2010, 05:41 PM   #1017
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I worked backwards with a BSC Calculator, determined that the effective front baffle width was about 11 inches -- here's a screenshot with (lower green trace) and without the correction (1.5mH in parallel with 3.7R):

Click the image to open in full size.

Edit: This is the XO from the AX Article

Last edited by jackinnj; 2nd October 2010 at 05:44 PM.
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Old 17th October 2010, 01:17 AM   #1018
JZatopa is offline JZatopa  United States
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Just curious if anyone has had a chance to listen to the the Thor and gedlee's speakers. They are two different ways of doing the same job but I am curious to hear how they compare considering these two kits seem to be the top of the DIY kits available today.
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Old 31st October 2010, 09:38 PM   #1019
HiFi Si is offline HiFi Si  New Zealand
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A bit of a late question - I hope that this thread is not dead!

I was a bit of an early adopter of the Odin and built the early design with the W17-E002 drivers and Millenium Tweeter. I went with a xo design that was faxed to me by Seas USA, upon an advisory from Madisound about concerns with the original design. I also upgraded to Alphacore Inductors and Sonicraft caps..

I am keen to try Jim's design, but of course I have the question about compatibility with the W17 drivers, which have slightly different T/S parameters...

Does anyone have any advice on this?

cheers

Simon
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Old 3rd December 2010, 01:59 PM   #1020
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Jim,

is that a new version of your redesigned Thor XO? Or does it just work with the Odins? The topology seems identical but the values are very different from what I know (e.g. 8.7/22 uF in series with the tweeter rather than 5.7/18).

Thanks,
Hauke
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