Seas' T17 and T18 coaxial loudspeakers - diyAudio
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Old 23rd March 2005, 01:51 PM   #1
SSassen is offline SSassen  Netherlands
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Default Seas' T17 and T18 coaxial loudspeakers

I've just finished my 2nd subwoofer project and since then I've decided to route all my <80Hz signals to the sub using my receiver. To up the bar on the surround speakers (now an assorted bunch of Mission loudspeakers) I've decided to build new ones.

I'm thinking of using Seas' T17 or T18 coaxial loudspeakers for all 6-channels as that would solve my time alignment problems as well, as I don't have to go for a mtm configuration for the center and all loudspeakers would truely be identical.

Unfortunately I've only found a handful of designs based on these loudspeakers of which Tony Gee's USB is close to what I'm looking for. But his design is the only 'audiophile' design I've seen, which is what I'm looking for, not some ill-researched sunday evening jobby. So what's with the lack of designs for these loudspeakers?

Am I missing something here, and are these coaxial loudspeakers not very well suited for the audio enthusiast? Or is there something else I missed?

Best regards,

Sander Sassen
http://www.hardwareanalysis.com
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Old 23rd March 2005, 01:55 PM   #2
Nisbeth is offline Nisbeth  Denmark
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Go to madisounds (www.madisound.com) online discussion board and do a search there. There have been several discussions about these drivers there. Madisound also have a few designs for these on their website somewhere


/U.
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Old 23rd March 2005, 02:15 PM   #3
SSassen is offline SSassen  Netherlands
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Thanks Nisbeth but that forum is a nightmare to navigate, let alone find anything. The only design Madison lists 'supposedly' is from a Seas engineer, which lacks vital information.

Best regards,

Sander Sassen
http://www.hardwareanalysis.com
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Old 23rd March 2005, 05:53 PM   #4
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Hi Sander, there is an official SEAS design for the T18 driver. Details can be found at the Madisound website.
This looks to be a good design, and is at least a good starting point.

the link is
http://www.madisound.com/Seas%20H114...nd%20Xover.pdf

Let me know if there is still information missing that you need. I have extensive experience of working with concentric drivers, so can give you some pointers.

Andrew
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Old 23rd March 2005, 06:02 PM   #5
SSassen is offline SSassen  Netherlands
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Andrew,

I stumbled across that one also, as per my reply to Nisbeth, unfortunately that pdf is pretty vague, and doesn't list anything specific but a box volume and a proposed filter. What I'd like to know is the following:

- What are the benefits of using the T18 over the other coax drivers?
- What would be a preferable xover frequency for the T18?
- In a small 6-liter enclosure will I need to use baffle step correction in the filter?

Best regards,

Sander Sassen
http://www.hardwareanalysis.com
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Old 23rd March 2005, 06:57 PM   #6
Lusso5 is offline Lusso5  United States
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I plan on trying out the H1144 (T18 Coax) in a ML TQWT.

Below are models of it in MJK's Fostex FE-164 enclosure, with double the stuffing; I'm liking what I see.
Attached Images
File Type: jpg ml tqwt_spl.jpg (33.3 KB, 601 views)
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Old 23rd March 2005, 07:02 PM   #7
SSassen is offline SSassen  Netherlands
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Lusso5,

Thanks for sharing that bit of info, but as mentioned I'm looking for some small, bookshelf type of design, can't really fit six ML TQWTs in my living room, and don't need to either, I have all the bass I need.

Best regards,

Sander Sassen
http://www.hardwareanalysis.com
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Old 23rd March 2005, 08:32 PM   #8
Edgar is offline Edgar  Norway
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Have a look at the site of Stig Erik Tangen an his Gnurk speaker:

http://member.newsguy.com/~stigerik/

http://member.newsguy.com/~stigerik/html/body_gnurk.htm

He is a experienced designer, so i trust this speaker sounds good eaven if i have'nt heard it myself. I have heard his main system, and this is verry good!

Edgar
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Old 24th March 2005, 10:10 AM   #9
dkxdn is offline dkxdn  Denmark
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The Seas T18 is super and sounds very good and is perfect in a Surround system.
I have used it for ½ a year in the 3 front speakers. The crossover network is from http://www.intertechnik.com/user/itecubus_kt6_2.pdf but modified a little see on my site: http://home10.inet.tele.dk/dion/surround.htm

The best things of this coax unit is that you have a perfect balance even if you moved horizontal and the voices is very clear !
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Old 24th March 2005, 11:45 AM   #10
SSassen is offline SSassen  Netherlands
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Thanks Edgar, dkxdn,

I've simulated a WP172S Coax (H653) driver with X-over Pro 3 with the impedance (Z) being the parameter to optimize for, here are the results, any comments?

Click the image to open in full size.

Click the image to open in full size.

This looks to be a very easy driver to simulate, didn't even have to use a zobel network on the tweeter due to the high xo.

Best regards,

Sander Sassen
http://www.hardwareanalysis.com
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