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Old 18th February 2012, 03:02 PM   #1071
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Quote:
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I haven't tried switching the tweeter polarity, but if the woofers and tweeter are in phase at the crossover point (which I think they should be given the sims and measurements posted elsewhere in this thread), shouldn't you get a giant suckout at the crossover frequency when you switch polarity? Has anybody done measurements with this change?
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Old 20th February 2012, 08:35 AM   #1072
KarlXII is offline KarlXII  Sweden
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This is typically what happens when changing polarity on the tweeter:

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Old 21st February 2012, 01:46 AM   #1073
JC is offline JC  United States
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That's what I would expect, except at a lower frequency since Jim's version crosses over below 2000 hz.
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Old 21st February 2012, 11:02 AM   #1074
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Quote:
Originally Posted by KarlXII View Post
This is typically what happens when changing polarity on the tweeter:
the 4.5kHz peak in the original curve is a mechanical artifact of the woofers used in the Thor.

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Old 20th March 2012, 09:39 PM   #1075
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Default Thor ReRloaded

Hello there,
i quite like the thor and this thread, and i am wondering if any of you have seen, or better heard this Transmission line version of the thor, published in Hobby Hifi, 2004/04 ?
looks promising ,
cheers
Yurgs
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File Type: jpg ThorTL.jpg (53.4 KB, 329 views)

Last edited by yurgs; 20th March 2012 at 10:04 PM. Reason: typo
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Old 20th March 2012, 09:47 PM   #1076
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I have never heard of that version. How is it different?
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Old 20th March 2012, 10:03 PM   #1077
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I am not quite sure,
looks like they did a mod on the xover as well, the alum panels at the front.
They also mention that the dip in the freq response is caused by the shape of the frontpanel around the tweeters (so rounded edges should fix it).
apart from that it looks the same to me.
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Old 21st March 2012, 12:47 AM   #1078
Renron is offline Renron  United States
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Any Idea what the physical size is? That is what made the most difference.
Ron
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Old 29th March 2012, 08:10 PM   #1079
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They kept the size the same, just the phase on the outside of the cabinet was added.
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Old 19th April 2012, 06:14 AM   #1080
Byrd is offline Byrd  South Africa
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I have finally been able to carry out an FR plot. This is for the Small Thor with D'Apollito crossover. As has been stated before there doesn't seem to be any problem with suppression of the hf resonance in the magnesium cones.

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