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Old 24th November 2012, 07:32 PM   #371
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so , let's just wait for tomorrow

face up/down - irrelevant

what's important is that it must be really sealed , between gasket and box
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Old 25th November 2012, 06:52 AM   #372
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A lot easier to measure the displacement of the face of the driver though, so face down is preferred.

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Old 25th November 2012, 07:03 AM   #373
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Quote:
Originally Posted by buzzforb View Post
Here are the number son the cheap. Taken using added mass method....which i don't trust. Test box os glued up waiting for official test tomorrow. Does the speaker face in or out. I was assuming in, but not sure.
Fs/Qts is well matched, but Vas is way off if accurate, so depending on room conditions and how big a cab used the bass may sound a little lean on the lower Vas one.

FWIW, the Le value should be at 1 kHz, hence the very low values I questioned.

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Old 25th November 2012, 07:53 AM   #374
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I question accuracy, as changing the mass, changed the result. Clearly, it is a vrap shoot with that particular method.
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Old 25th November 2012, 01:43 PM   #375
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Yeah, just as the sealed cab needs to raise the driver's Fs at least 1.56x, so too must the added mass method lower Fs by 1.56x [0.641 x Fs], so a few quarters or steel washers isn't going to be enough. Near the end of my active building 'career', I got so lazy that I just clamped the driver to my 2.25" thick solid wood workbench since my cab alignments were typically large enough that Vas wasn't a major factor in how it performed.

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Old 25th November 2012, 01:45 PM   #376
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I had 56grams on them. About 75% of their supposed mms
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Old 25th November 2012, 05:35 PM   #377
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Here ya go.
Route could be a little bigger and perhaps get better seal, but i would think effects are minimal
Attached Files
File Type: txt Altec 1 - Vas 3^ft.txt (11.9 KB, 13 views)
File Type: txt Altec 2 - Vas 3^ft.txt (12.0 KB, 6 views)
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Old 25th November 2012, 06:31 PM   #378
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see ya later
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Old 25th November 2012, 08:33 PM   #379
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So i plugged the numbers into MJK's confirmation sheet and something is clearly wrong. Using presceibed Vas from driver 1, his sheet show a much lower BL ans Mms. Odd thing is, measured numbers aren't off far from the Altec listed numbers. Tried doing it the opposite way and entering BL trying to find VAS, things are closer, but Vas is way down
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File Type: doc MJK checksheet.doc (46.0 KB, 3 views)
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Old 25th November 2012, 08:40 PM   #380
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Here is driver 2.

I will assume measurement error and try again, concentrating on getting nice tight seal. If they come out similar, I will just go with it.
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File Type: doc MJK checksheet - 2.doc (46.0 KB, 5 views)
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