Clarity on Seas Thor Kit

[jackinnj]

Originally Posted by JC

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?

I lent out my XTZ, and in any event will have to wait until the weather gets warmer!

[KarlXII]

This is typically what happens when changing polarity on the tweeter:

[JC]

That's what I would expect, except at a lower frequency since Jim's version crosses over below 2000 hz.

[jackinnj]

Originally Posted by KarlXII

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.

[yurgs]

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

[johngalt47]

I have never heard of that version. How is it different?

[yurgs]

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.

[Renron]

Any Idea what the physical size is? That is what made the most difference.
Ron

[yurgs]

They kept the size the same, just the phase on the outside of the cabinet was added.

[Byrd]

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.