thanks in advance Mr Griffin,
http://www.diyaudio.com/forums/full...dio-alpair-10-mltl-design-14.html#post2093330
here i've posted my doubt days ago, so anyone can see the answer if they come to have the same doubt.
http://www.diyaudio.com/forums/full...dio-alpair-10-mltl-design-14.html#post2093330
here i've posted my doubt days ago, so anyone can see the answer if they come to have the same doubt.
was wanting to keep the jordans crossover free, for me it kind of defeats the point of a full range driver- but I understand that a ribbon should improve the top and and the off axis response.Is there any way of doing both, ie keeping the jordan crossover free and adding the tweeter albiet in a subtle way
No way. Jim's crossover is at 3k. If you bring it in at 10k, 12k, etc. you get overlap between tweeter and Jordan because the Jordan goes up so high.
Dave, do you mean it was annoying even when you were well off-axis? Are you saying you'd roll them off even without a tweeter? Thanks in advance!
Bill,
You have a homework assignment. The Jordan JX92S with a ribbon crossover is covered in my two long threads on the DIYAudio forum on either my mini-monitor or MLTL designs.
The Jordan with a ribbon design is a very synergistic solution. The ribbon tweeter is a significantly better tweeter than the JX92S is above 3000 Hz. Furthermore, why would you want the smearing that would result from having the Jordan and the ribbon both playing over the tweeter range? Bottom line is that the ribbon tweeter works best as a tweeter vs. used as a super tweeter.
Ribbons don't like first order crossovers because of power handling issues. So higher order crossing suits them much better.
Jim
You have a homework assignment. The Jordan JX92S with a ribbon crossover is covered in my two long threads on the DIYAudio forum on either my mini-monitor or MLTL designs.
The Jordan with a ribbon design is a very synergistic solution. The ribbon tweeter is a significantly better tweeter than the JX92S is above 3000 Hz. Furthermore, why would you want the smearing that would result from having the Jordan and the ribbon both playing over the tweeter range? Bottom line is that the ribbon tweeter works best as a tweeter vs. used as a super tweeter.
Ribbons don't like first order crossovers because of power handling issues. So higher order crossing suits them much better.
Jim
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I got 400-500 hours on them and listened to them every which way. I couldn't live with them FR. They might well make an excellent midbass (but probably not as good as the JX150). Note that the ones i had were from the 1st batch made in China after Mark Fenlon's involvement ceased. From the many comments on them, i'm going to speculate that the earlier VIFA made ones were better. And the later Chinese batches may be too.
dave
The A10 will be the 1st 1st gen Alpair to get all the tech goodies of the 2nd gen Alpairs. It will be really telling to see how much the new tech brings to the party ...
dave
Hi Dave, thank you for that. Mine came from the group buy [edit: I think!] (second hand from forum member boudy). Yours are also from the group buy, probably? Although they are not soft on top, they are spectacularly clear and there's so much bass. Maybe I will try Jim's Aurum Cantus ribbon after all! (Thanks to you too, Jim.)
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I built both Jim's minimonitor and GM's 48" MLTL. Good as they were just using the JX92S, they were transformed by a ribbon - in my case the Fountek JP3. After trying several xovers Jim's 3k design worked best.
Yes. I would not call the top clear... there was something up there that affected me much as someone running their fingernails down a blackboard.
dave
Pretty damning (unless it was just a bad example).
Thanks Jim for putting me right about the top end/super tweeter idea. I just thought it might be a possibility and wanted to ask. And I guess you are also saying the same thing as planet 10, the top end is rough
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Let's not "damn" a driver without hearing it, though. Dave (planet10) would be the first to emphasize the Y in DIY 
This driver is a special-purpose precision device. Personally, I'm delighted with it, but I don't doubt Dave's experience at all. There's a lot of latitude for personal preference, room dimensions, decay time, cab, source, musical styles etc.
Not everybody is equally impressed by Feastrex (or Fostex for that matter). Or Lowther. Why should the Jordan's have to please everyone? They please whoever likes them, just like any other driver
This driver is a special-purpose precision device. Personally, I'm delighted with it, but I don't doubt Dave's experience at all. There's a lot of latitude for personal preference, room dimensions, decay time, cab, source, musical styles etc.
Not everybody is equally impressed by Feastrex (or Fostex for that matter). Or Lowther. Why should the Jordan's have to please everyone? They please whoever likes them, just like any other driver
Well said... the fellow who ended up with mine likes them just fine. He by the way has promised to compare them to the CHR70eN he got (originally) for surround duty.
I for instance, in the limited time i had them, couldn't get the 1 set of "cheap" Feastrex field coils i had thru to sound as good as a set of FE127eN Fonken. I did decide that to keep cool they should be OB.
dave
I for instance, in the limited time i had them, couldn't get the 1 set of "cheap" Feastrex field coils i had thru to sound as good as a set of FE127eN Fonken. I did decide that to keep cool they should be OB.
dave
exactly, will audition in a few weeks.
My reflex cabinet design is coming along well- its approx 17.5 litres and can accomodate two small full range drivers.
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