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Old 5th December 2012, 11:15 PM   #411
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by cogitech View Post
Thanks to Cal for turning me on to this thread.

What's the concensus on EL70 drivers for this project?

I have seen some not-so-favourable mention in recent posts regarding the prospect of using EL70s, but xrk initially thought they might be a good candidate.

Has anyone tried it?
I think I said CHR70, but these look good too. I think the Cornu is very tolerant of different drivers.
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Old 6th December 2012, 12:01 AM   #412
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Originally Posted by xrk971 View Post
I think I said CHR70, but these look good too. I think the Cornu is very tolerant of different drivers.
Thanks for the reply. Would you be so good as to have a look at the T/S numbers of the EL70s and let me know what dimensions would be ideal for them?
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Old 6th December 2012, 12:27 AM   #413
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I am happy with the appearance for something called underlay. Last pic shows the piece I added for strength. In that pic you can see the oil contamination on the edge that I now have to deal with

Bad Cal!
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Old 6th December 2012, 12:43 AM   #414
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Quote:
Originally Posted by xrk971 View Post
I think the Cornu is very tolerant of different drivers.
I think so too.
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Old 6th December 2012, 12:54 AM   #415
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Originally Posted by cogitech View Post
Thanks for the reply. Would you be so good as to have a look at the T/S numbers of the EL70s and let me know what dimensions would be ideal for them?
All I do is scale the channel depth so that the throat area is at least as big as the driver piston area Sd. For the EL70 follow the 70 x70 cm plan and make it 3.9 in deep (4 in is probably ok). One thing that concerns me with these drivers is that they don't have a rising high end like TB W4-1337 which looks like a tweeter from 10k to 20k Hz. The Cornu puts out so much bass it can really benefit from an 'unaturally' high end to get decent highs to compete with thr bass. Usually you have the other problem, not enough bass. Also, if you don't need the horn to reach down to 38 Hz you can scale it smaller, the low bass tuning freq scales proportionally.

Last edited by xrk971; 6th December 2012 at 01:10 AM.
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Old 6th December 2012, 12:56 AM   #416
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by Cal Weldon View Post
I am happy with the appearance for something called underlay. Last pic shows the piece I added for strength. In that pic you can see the oil contamination on the edge that I now have to deal with

Bad Cal!
Good idea to put the wooden handles there. Looking good Cal!
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Old 6th December 2012, 01:09 AM   #417
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Quote:
Originally Posted by xrk971 View Post
All I do is scale the channel depth so that the throat area is at least as big as the driver piston area Sd. For the EL70 follow the 70 x70 cm plan and make it 3.9 in deep (4 in is probably ok).
EL70 is smaller than FF125.

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Old 6th December 2012, 01:13 AM   #418
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by planet10 View Post
EL70 is smaller than FF125.

dave
Yes, that's why channel depth on FF125 was 4.5 inch and 3.9 inch for EL70.
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Old 6th December 2012, 01:42 AM   #419
iko is offline iko  Canada
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Quote:
Originally Posted by Cal Weldon View Post
I am happy with the appearance for something called underlay. Last pic shows the piece I added for strength. In that pic you can see the oil contamination on the edge that I now have to deal with

Bad Cal!
Too bad about the oil spill Cal!

Quick question for you, since you have the same plywood as I. Do you have any idea what the top veneer is? Does it look good with the oil on? I'm not sure whether to go for shellac or simply do it with oil like you.
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Old 6th December 2012, 01:50 AM   #420
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Originally Posted by planet10 View Post
What do you expect they are, afterall, Dell Boxes

Don't forget that you want to get at last 100 hrs on them before paying much attention to what they sound like.

dave
Thanks guys! Funny thing is, I had some old 5" mid/base drivers from an old Kenwood stereo and put them in the big Dell cardboard boxes in parallel with the vifas. It completely floored me: full nice bass and mids, and there are highs too. The cardboard boxes beat my other speakers. The cornucopya has to be better, I can't keep the cardboard in the living room.
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