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Old 4th August 2009, 05:35 PM   #1
Defo is offline Defo  Norway
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Default Seas excel and 18sound XT120 horn combo

Thinking of making a simple two-way using these:

http://www.seas.no/index.php?option=...d=71&Itemid=95

http://www.eighteensound.com/index.a...roduct&pid=179

http://www.bcspeakers.com/product.php?id=0000000010

Open baffle for the Seas crossed actively at 2khz to the 18sound and B&C combo.

How low will the Seas go in a 30x90 cm baffle? What are your thoughts of the project?
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Old 4th August 2009, 05:45 PM   #2
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Check my own dipole project with the Seas W22:
My open baffle dipole with Beyma TPL-150

My baffle is effectively as large as yours. I found that the W22 dont output much below 300 Hz.

My inital thoughts are:
- 2 kHz is a bit too high for the Seas W22. I recommend 1.5 kHz max
- you should add a bass driver crossed over around 300 Hz
- your speaker will be dipole in the bass and midrange only....
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Old 4th August 2009, 08:20 PM   #3
Defo is offline Defo  Norway
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Quote:
Originally posted by StigErik
Check my own dipole project with the Seas W22:
My open baffle dipole with Beyma TPL-150

My baffle is effectively as large as yours. I found that the W22 dont output much below 300 Hz.

My inital thoughts are:
- 2 kHz is a bit too high for the Seas W22. I recommend 1.5 kHz max
- you should add a bass driver crossed over around 300 Hz
- your speaker will be dipole in the bass and midrange only....
I'm gonna use a JBL 2226H sub for bass duty. I'm afraid 300hz is a bit too high, as everything below will be mono.

The reason for the 2 khz crossover point is to match directivity, and to be able to use the lesser expensive DE10 and XT120 instead of something like DE250 and XT1086.

I see cone breakup starting at about 3 khz. Using 24db slopes at 2 khz should be okey? Or maybe 1,8 khz if the DE10 can handle it.
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Old 4th August 2009, 09:00 PM   #4
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You may be able to get the W22 lower than 300 Hz with some EQ, and maybe a bit wider baffle.

The reason I recommend 1.5 kHz XO for the W22 is that distortion starts to rise quite a lot at 1/3 of the breakup frequency at 5 kHz. 2 kHz with 24 dB/oct slope should work ok though...
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Old 4th August 2009, 09:04 PM   #5
Defo is offline Defo  Norway
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Quote:
Originally posted by StigErik
You may be able to get the W22 lower than 300 Hz with some EQ, and maybe a bit wider baffle.

The reason I recommend 1.5 kHz XO for the W22 is that distortion starts to rise quite a lot at 1/3 of the breakup frequency at 5 kHz. 2 kHz with 24 dB/oct slope should work ok though...
I see

How does the nextel coated paper version compare to the magnesium?
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Old 4th August 2009, 09:10 PM   #6
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The paper version dont have the same wild cone breakup, and can be crossed over higher. 2 kHz should not be any problem. It also has 3 dB higher sensitivity.
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Old 4th August 2009, 09:15 PM   #7
Defo is offline Defo  Norway
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Quote:
Originally posted by StigErik
The paper version dont have the same wild cone breakup, and can be crossed over higher. 2 kHz should not be any problem. It also has 3 dB higher sensitivity.
Hmm, why does the magnesium version seem to be more popular?
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Old 4th August 2009, 09:18 PM   #8
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Because its sound quality is superior to most anything?
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Old 4th August 2009, 09:26 PM   #9
Defo is offline Defo  Norway
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Quote:
Originally posted by StigErik
Because its sound quality is superior to most anything?
So the magnesium sounds better then the paper version within its usable range ofc? What is exacly is it superior at?

How do you think any of them will blend with the compression driver?
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Old 4th August 2009, 09:41 PM   #10
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Compression drivers... I dont like them, they distort too much, and their time domain behaviour is in general bad bad bad. Better look for a good dome or planar tweeter!

The paper version of the Excel W22 dont sound as detailed and clean as the magnesium, it does have more coloration. The mag W22 is the cleanest sounding midrange I've ever heard, up to 1.5 kHz that is.

About midranges - this is very interesting reading:
http://www.linkwitzlab.com/mid_dist.htm

Mr Linkwitz also favours the W22EX001.
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