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Old 10th November 2012, 03:11 AM   #1
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Default Thor speaker cabinets. what to do?

I just picked up a pair of Thor speaker cabinets, wired and stuffed - just no speakers inside. I want to do an MTM style of course, but what other drivers can i use besides the SEAS Excel? Looking to spend $500 or so...
I dont really want to break the bank - do you have any sugestions....
Thanks in advance
Mike
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Old 11th November 2012, 02:13 AM   #2
system7 is offline system7  United Kingdom
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The SEAS THOR KIT uses the SEAS Excel W18E001 Magnesium Woofer and the T25CF002 Excel Millenium Soft Dome.

I'd think you could substitute the cheaper Prestige ER18RNX and the T25CF001 Soft dome.

The 90dB 110mm Morel CAT 328 might have enough output too.
http://www.falconacoustics.co.uk/dri...0-tweeter.html

You'll need a notch at 4.8kHz on the woofer, but then the Thor has one similar : L2,C1,R1 on the Thor schematic anyway!

Alan Yates' Laboratory - VK2ZAY's Engineering Calculators - LCR Resonance

Looks doable to me. Doubtless a bit of fine tuning needed.
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Old 11th November 2012, 01:58 PM   #3
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Thanks for the suggestions Steve, much appreciated - will have to look at what some of my local supply companies can suggest also.

The cabinets are very well made, will have to find some use for them...
Best regards

Mike
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Old 11th November 2012, 02:50 PM   #4
system7 is offline system7  United Kingdom
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I looked at all the 18 series SEAS woofers in this context. Of course they all fit.
SEAS PRESTIGE WOOFERS

The Paper CA18RLY was too efficient to easily match to a tweeter. The Poly U18RNX/P was nice but too different on bass parameters. Both were electrically rather different too. The Prestige metal cones were too difficult on breakup for this simple network. The CA18RNX had a midrange peak that would need attention.

All that needs doing here to the crossover is to increase R1 to 1 ohm to reduce the notch initially, because the paper woofer has less cone breakup. It's actually set at 4.6kHz, but that looks near enough. Usual SEAS simple network. Go to Troels Gravesen or Zaph Audio if you want fussier.

Click the image to open in full size.

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Mark K has a SEAS non-D'Appolito speaker that uses the ER18RNX with an "unusual" tweeter crossover. He deals with the bass notch very well:
The Seas ER18DXT ported two way
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Last edited by system7; 11th November 2012 at 03:04 PM.
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Old 11th November 2012, 03:03 PM   #5
sreten is offline sreten  United Kingdom
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Hi,

The Thor cabinet as it turns out it is not very well designed for the drivers it is
intended to use. Search and you will find expansive details of its design faults.

Reverse engineering indicates their best use is a 6.5"/1" MTM with a bass/mid
driver with parameters more suited to the line, offhand I can't tell you what
they might be without a deep investigation I'm not prepared to do.

Though I'd surmise a high value MTM with "mid level" drivers is likely best.

What you want is suitably different bass parameters.

rgds, sreten.

I don't have the MJK worksheets, what is needed here.
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Last edited by sreten; 11th November 2012 at 03:17 PM.
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Old 11th November 2012, 03:13 PM   #6
system7 is offline system7  United Kingdom
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Well, you're rather good at reflex IIRC, sreten, so you might give a quick opinion. My feeling was that the ER18RNX at Qts 0.32 might work rather better than the original W18E001 with a Qts of 0.42.

Simple enough transmission line by the look of it. Guess you could play with damping.
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File Type: png SEAS_Thor.PNG (49.8 KB, 255 views)
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Old 11th November 2012, 03:32 PM   #7
sreten is offline sreten  United Kingdom
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Hi,

AFAIK from what I surmised, the Thor cabinet suits one original driver not two,
and yes, whilst I'm into unusual vented alignments, I don't know enough here.

Well not enough to discuss the particulars, without some serious time effort.

rgds, sreten.
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Old 11th November 2012, 03:34 PM   #8
system7 is offline system7  United Kingdom
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Ooh, this is interesting. The original Thor designed by Joseph D'Appolito used the W18EX001 with a Qts around 0.26 according to Joe D'Ap's original design article.
http://www.seas.no/images/stories/di...hor_Review.pdf

This could explain a lot! That's a tighter control on the bass, isn't it?
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Old 11th November 2012, 03:51 PM   #9
sreten is offline sreten  United Kingdom
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Hi,

Search on why its wrong, not why its right, which is isn't, search on fat Thor.

rgds, sreten.
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Old 11th November 2012, 03:59 PM   #10
system7 is offline system7  United Kingdom
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Quote:
Originally Posted by sreten View Post
Hi,

Search on why its wrong, not why its right, which is isn't, search on fat Thor.

rgds, sreten.
OMG, a 110 pages of typical diyaudio waffle!

Clarity on Seas Thor Kit

Seems obvious to me (on the merest quick glance) that these people are a bunch of Moaning Minnies.

I think we've fixed it in a mere page, eh, Sreten.
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