Ever think of building a Cornu Spiral horn? Now you can! - Page 33

Cal Weldon · 6th January 2013, 06:32 PM

Nice job there Xerxes!

Cal Weldon · 6th January 2013, 06:42 PM

Well I must say it's another successful build. I remeasured the cone. It's a mere 24 cm^2 so smaller than tweeters of yesteryear.

xrk971 · 6th January 2013, 06:49 PM

Cal,
Looks fantastic! Congrats

Your edges and cuts look very clean. How was it building in all foam this time? And you are killing me with anticipation.... how do the Jordan's sound in the spiral?

Cal Weldon · 6th January 2013, 06:51 PM

Thanks X,

They sound better than in any other box I've tried. There's actually a hint of bass.

xrk971 · 6th January 2013, 06:55 PM

Is it my imagination but those Jordan's resemble Mark Audio's in frame, cone, and terminal locations. What is the Fs of this driver?

Cal Weldon · 6th January 2013, 07:13 PM

Other way round. Mark used to work for Ted Jordan before starting Mark Audio. The drivers are old enough that I can't find much on them but this is about the 3rd generation of the 50mm cone drivers. There is only a surround, no spider so you have to be careful with excursion.

I would guess the Fs to be in the neighbourhood of 100Hz, maybe a bit less as they have a recommended XO of 120Hz when used with a woofer. Sensitivity is about 80 or 82 dB.

EDIT: I may not be right about the above as the driver cone is a little bigger than 50mm [hence the 6T designation?], more like 54mm and I have learned the 50mm cones had a very high Fs and a Qts well above 1.0 so I'm not sure what these are.

planet10 · 6th January 2013, 07:29 PM

Quote:

Originally Posted by xrk971

Is it my imagination but those Jordan's resemble Mark Audio's in frame, cone, and terminal locations.

The J6T was some of Mark's last work for Ted Jordan, In the kafuffle with EAD Mark ended up with the rights and the J6T was evolved into the Alpair 5.

dave

Cal Weldon · 6th January 2013, 07:32 PM

Thanks Dave, always a wealth of knowledge.

Cal Weldon · 6th January 2013, 08:04 PM

I am thinking.

I know that scares the people who know me so let me clear the air. This is about speakers.

I have to fulfill my duty as 'yes man' for my honey but when I am done, I'm going to hang a big ol' choke on the larger Cornus and a giant cap on the new ones and run them together as they seem to each have a niche to fill.

xrk971 · 6th January 2013, 08:14 PM

Awesome, a giant cornu two-way wall speaker. Hey you are in the wrong forum if you do this

6th January 2013, 06:32 PM	#321
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Nice job there Xerxes! __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

6th January 2013, 06:51 PM	#324
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Thanks X, They sound better than in any other box I've tried. There's actually a hint of bass. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

6th January 2013, 07:13 PM	#326
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Other way round. Mark used to work for Ted Jordan before starting Mark Audio. The drivers are old enough that I can't find much on them but this is about the 3rd generation of the 50mm cone drivers. There is only a surround, no spider so you have to be careful with excursion. I would guess the Fs to be in the neighbourhood of 100Hz, maybe a bit less as they have a recommended XO of 120Hz when used with a woofer. Sensitivity is about 80 or 82 dB. EDIT: I may not be right about the above as the driver cone is a little bigger than 50mm [hence the 6T designation?], more like 54mm and I have learned the 50mm cones had a very high Fs and a Qts well above 1.0 so I'm not sure what these are. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

6th January 2013, 07:32 PM	#328
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Thanks Dave, always a wealth of knowledge. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

6th January 2013, 08:04 PM	#329
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	I am thinking. I know that scares the people who know me so let me clear the air. This is about speakers. I have to fulfill my duty as 'yes man' for my honey but when I am done, I'm going to hang a big ol' choke on the larger Cornus and a giant cap on the new ones and run them together as they seem to each have a niche to fill. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting


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6th January 2013, 06:49 PM	#323
xrk971 diyAudio Member Join Date: Oct 2012 Location: Virginia	Cal, Looks fantastic! Congrats Your edges and cuts look very clean. How was it building in all foam this time? And you are killing me with anticipation.... how do the Jordan's sound in the spiral?

6th January 2013, 06:55 PM	#325
xrk971 diyAudio Member Join Date: Oct 2012 Location: Virginia	Is it my imagination but those Jordan's resemble Mark Audio's in frame, cone, and terminal locations. What is the Fs of this driver?

6th January 2013, 08:14 PM	#330
xrk971 diyAudio Member Join Date: Oct 2012 Location: Virginia	Awesome, a giant cornu two-way wall speaker. Hey you are in the wrong forum if you do this

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