Thor speaker cabinets. what to do? - Page 2 - diyAudio
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Old 11th November 2012, 05:54 PM   #11
Starre is offline Starre  Sweden
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Hi system7, why do you think the ca18RLY has too high effeiciency to easily match a tweeter?
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Old 11th November 2012, 06:26 PM   #12
system7 is offline system7  United Kingdom
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Quote:
Originally Posted by Starre View Post
Hi system7, why do you think the ca18RLY has too high effeiciency to easily match a tweeter?
Because it's gonna be around 91dB SPL when twinned even with bafflestep rolling it off. Remember that doubling drivers adds 6dB.
H1217-08 CA18RLY

Compare with the original suggested driver which is 4dB quieter:
E0018-08S W18E001

I think you'd struggle to get the tweeter loud enough.

Click the image to open in full size.

Only 2 ohms to play with there.
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Last edited by system7; 11th November 2012 at 06:28 PM.
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Old 11th November 2012, 07:07 PM   #13
Starre is offline Starre  Sweden
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Yes of course, I was not aware it has two woofers, that explains it. I have a pair of them and I will only use one in each speaker box.
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Old 12th November 2012, 01:37 AM   #14
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Mike

I bought the drivers from that system and I am still waiting for them I think they were the fat thors so the cabinet should be a little better to match.
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Old 12th November 2012, 01:58 AM   #15
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Mike i should say my wife bought me the drivers and xovers for xmas. I have new cabinets started. Small thors. Good to know I did not get the wiring and stuffing I can order that stuff now.
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Old 12th November 2012, 03:17 PM   #16
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Mike

In the Thread some thor models to mull over Scottmoose has modeled some alternative drivers for the fat thor. #42 show the FR
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Old 12th November 2012, 05:37 PM   #17
system7 is offline system7  United Kingdom
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Well, God help us if this little thread turns into a Clarity on Seas Thor Kit 110 page epic!

I've gotta admit I'm pretty baffled how the original design's W18EX001 got replaced by the less reflex friendly W18E001 . But we don't care in this case!

Seems to me that this is all pretty straightforward. The cabinet is just your regular folded transmission line something like this around 50-60L. Add some stuffing and damping to taste.

Click the image to open in full size.

The Etude-TL is a design remarkably close to the Thor. It uses a couple of Polycone Vifa P17WJ-00-08 Woofers, which are almost identical on bass parameters to the Paper SEAS ER18RNX except for the change of cone material. Vas about 35L, Qts around 0.34, Fs around 35Hz. Metal Vifa D25 tweeter if that's your cup of tea. The Etude is a 2.5 design rather than a D'Appolito, but hey. I can actually see no significant difference in the two cabinets.

Seems to me this Thor cabinet is going to be OK. The Etude TL designer (Paul Spenser) claims no great grumbling bass. It's about what you'd expect from a 50-60L design. But you'd want a biggish room to avoid boom IMO.

Below the Thor and the Etude boxes.
Attached Images
File Type: png SEAS_Thor.PNG (49.8 KB, 182 views)
File Type: png Red_Spade_Etude_TL_Vifa_P17WJ.PNG (65.5 KB, 170 views)
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Old 12th November 2012, 06:54 PM   #18
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Quote:
Originally Posted by system7 View Post
Seems to me that this is all pretty straightforward. The cabinet is just your regular folded transmission line something like this around 50-60L. Add some stuffing and damping to taste.
I believe the enclosure in question is one of the alternates and not the regular THot, so you volume estimates will be off.

dave
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Old 12th November 2012, 07:36 PM   #19
sreten is offline sreten  United Kingdom
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Originally Posted by Mike in NJ View Post
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
Hi,

Getting back to the original post a very good value MTM is :
(I think you'd be hard pushed to do a lot better up to $500).

My RS180 MTM Design

Excellent minimalist crossover design for such drivers, nice low x/o point
which is whats needed for a MTM, very much similar to the Thor design.
Except of course it costs bucket loads less and is far better value.

Suggest using a wide bar on the front of the speaker to tilt the
tweeter to ear height and aid the overall speaker stability.

I suspect the higher Fs / lower Vas drivers will better suit the Thor cabinets.

rgds, sreten.

I'd suggest a 47uF NPE and a 3.3uF Poly for the tweeter 50uF.
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Last edited by sreten; 12th November 2012 at 07:53 PM.
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Old 12th November 2012, 09:47 PM   #20
system7 is offline system7  United Kingdom
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Interesting design by Jeff Bagby there, sreten. He is a top man. Enjoyed reading that. Interesting remarks about the necessary midrange dip on MTMs. Lynn Olson ran into that one on the Ariel. I also like his notion that speaker crossovers virtually design themselves.

Just to tie up a loose end, Planet10, I used the published SEAS Thor data:
Thor

You need a good amplifier for these 4 ohm babies, don't you?
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