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Old 12th May 2008, 08:23 PM   #21
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We simply took a known weight of modeling clay rolled it out into two flat curved shapes and gently placed them on the edge of the whizzer cone. There was absolutely no trace of it on the cone when we were done, however, the method is perhaps risky for another reason, that being that there's still the potential for the clay to "bounce" or "buzz" at a level that is undetectable, but that could influence the results, so I don't think I would choose to do it again.

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Old 13th May 2008, 08:06 PM   #22
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I've finished dialing in the crossover and equalization
for the D9nf in open baffles with a 15" woofer. The
sound is really good, although the setup would be regarded
as provisional. I plan to spend some time enjoying this before
making further changes.
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Old 13th May 2008, 08:07 PM   #23
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Here's a closer view of the front.
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Old 13th May 2008, 08:09 PM   #24
badman is offline badman  United States
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Solid vented box behind the woof and you've got close to a BassZilla.

What's the 15?
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Old 13th May 2008, 08:10 PM   #25
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And here's an angle shot, showing the rear support wings
on either side of the woofer.

The nominal size of the enclosure is 48" X 24".
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Old 13th May 2008, 08:16 PM   #26
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Lastly, here's a composite response curve of the speaker,
taken at 1 meter on-axis with the D9nf.

The response below 200 Hz has been taken at MLSSA's 5 KHz
bandwidth to get a good picture of the bottom end, and the
response above 200 Hz was taken at 40 KHz bandwidth. The
curves have been smoothed at 1/3 octave.

The amplifiers are an F3 on the top, and an X150 on the bottom.

The crossover and equalization were determined through listening
tests, and currently the crossover is 100 Hz at 12 db/oct.

Both drivers are wired in phase.

The D9nf has been equalized with a low Q notch filter at 6 KHz,
with a -4 dB depth.

Any questions?
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Old 13th May 2008, 08:31 PM   #27
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Quote:
Originally posted by badman
Solid vented box behind the woof and you've got close to a BassZilla. What's the 15?
No box behind the woof. The 15 is a pretty generic OEM that I
had made a few years ago. Light cone, big motor, 25 Hz Fs.
Lots of drivers, like the Alpha 15's, will fill the bill.
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Old 13th May 2008, 08:47 PM   #28
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Quote:
Any questions?
Sound as B20?
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Old 13th May 2008, 10:36 PM   #29
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Quote:
Originally posted by nicoch46


Sound as B20?
One of these days maybe I'll put out a graphic showing
"value" in terms of performance / price for these models.

On one end, the Pioneer Bu20Fu20 - on the other end, Feastrex.

What do you suppose the graph would be for cars?

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Old 13th May 2008, 11:20 PM   #30
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>>> On one end, the Pioneer Bu20Fu20 - on the other end, Feastrex.

Hi value, great performance for the price all the way to cost no object ultimate performance... I say:

VW GTI (B20) - - - Lamborghini (Feastrex)

Audi/BMW/Mercedes (Fostex)
Rolls/Bently (Lowther)

Maybe, maybe not.
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