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Old 10th May 2008, 04:32 AM   #11
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According to Mr. Teramoto, one reason for the rejoicing in Feastrexville tonight that Nelson Pass is using a pair of these drivers stems from the fact that in much the same way that the drivers reflect the personality of their builder, the drivers also seem to come to reflect the personality of their user. That opinion is based on his follow-up observation of different units and they way they have been used by their respective users. Mr. Teramoto told me on the phone a few minutes ago that one incident in particular comes to mind. Of all the D5nf units that have been shipped so far, there was exactly one pair that Mr. Teramoto felt like he wanted to recall for a "service" reconing: the very first pair of commercial units that were delivered to a paying customer. He had some second thoughts after shipping the first pair of D5nf and made a change from pair No. 2 onward, a decision which he felt improved the sound significantly. He had been maintaining regular contact with that customer over the span of a year and was mightily impressed with how that customer was using his units, and finally suggested to the customer that those units be shipped back for a recone that would bring them up to the same standards as all the other D5nf units. When that very first pair of D5nf units came back, Mr. Teramoto was amazed by how good they sounded -- he almost felt it was a shame to recone them since it might them take another year of aging for them to sound as good as the older drivers! But he did make the change because he felt that in the long run the drivers would benefit and the customer did report that he could detect the overall improved character of the reconed drivers, in spite of their newness, upon their return. (At the opposite extreme there was a case of a pair of drivers that were badly abused by their owner and had to be repaired out of warranty; Mr. Teramoto was aghast that someone would spend so much for a pair of drivers only to treat them so badly.) So if the user of the drivers plays a role in "finishing" their sound and in drawing out their full potential, the pair of D9nf drivers now in Nelson Pass's hands should be counting their blessings, for he will probably have them singing very sweetly indeed.

-- Chris
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Old 10th May 2008, 04:58 PM   #12
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... Everything is relative I guess
All of a sudden those Lowthers are starting to look attractive in a price-range formerly known to cause dizziness and shortness of breath.

Damn sexy tho'
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Old 10th May 2008, 06:15 PM   #13
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Default D9nf

Nelson,

I will be very anxious to hear your results.

Joe Cohen
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Old 11th May 2008, 08:23 PM   #14
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Here's the first particle of data, a free air impedance curve of both
drivers. The top curve (@60 Hz) is one driver out of the box, the middle
one is the second driver, and the bottom is that same driver after
a short workout, showing lower Q from slightly broken-in suspension.

Nice consistency between the two.
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File Type: gif feastrex d9nf z.gif (11.9 KB, 3942 views)
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Old 11th May 2008, 08:52 PM   #15
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Nelson,

Will you provide TS params as we don't have these for this driver yet?

Thanks,

Joe
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Old 11th May 2008, 09:50 PM   #16
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Excellent. Thanks (as always) Nelson.
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Old 11th May 2008, 09:58 PM   #17
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Joe,

FWIW, simple measurements of T/S parameters taken with the Woofer Tester 2 are available here:

http://puremusicgroup.com/yabb/YaBB.pl?num=1191708899

There are several ways of arriving at T/S parameters, and the results may vary slightly depending on the method, how the measuring devices are calibrated, etc., but I expect they should be in the general ballpark of those figures.

-- Chris
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Old 12th May 2008, 12:41 AM   #18
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I'll have to build a box with a known volume to get the T/S parameters,
and initially I have them in open baffles.

I think it will be a while before they come out of those
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Old 12th May 2008, 06:46 AM   #19
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Thanks, Chris, I'd forgotten about that post. We just did some testing of the D5nf and the D5e TypeII. I'm a little reluctant to publish the results as I think, at least in regard to the D5nf, that they were somewhat anomolous. We came up with a much higher Qts than any other previous tests. We used the weighted cone method with MLSSA software.
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Old 12th May 2008, 09:10 AM   #20
OzMikeH is offline OzMikeH  Australia
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you'd be a brave (or very rich) man to use the weighted cone method on these. I'm cringing at the thought.
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