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Old 20th October 2009, 04:17 PM   #521
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Quote:
Originally Posted by Jim Shearer View Post

4 mH Erse Super-Q $19.14
12 mH Erse Super-Q $22.38
24 uF Solen cap $11.33
82 uF Solen Cap $28.05
Which is about $81 per side for the XO.
I should be able to scare up all those out of my junk box.

In the end we will probably run them active most of the time.

dave
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Old 24th October 2009, 03:18 PM   #522
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Was anybody sensible enough to save the original article, and have it available? I have the drivers and the crossover parts securely sequestered in the den, but the article no longer appears on Martin's site. TIA - Pat
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Old 24th October 2009, 03:36 PM   #523
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Here it is:

OB Theory

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Old 24th October 2009, 03:36 PM   #524
ecir38 is offline ecir38  United States
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OB Theory

Brad
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Old 24th October 2009, 04:18 PM   #525
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Thanks, guys. As always, I could have looked a little harder, but I had followed my old link to the pdf, and that link no longer worked.
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Old 15th November 2009, 10:08 AM   #526
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Quote:
Originally Posted by mor2bz View Post
I have a mac. and so cannot use Mathcad. Anyone willing to model some baffles for me? I will Pay Martin the $25 gladly.
If your Mac has an Intel processor then you can use Vmware fusion to run Windows on it. Works a treat, I only use a Mac as well, but can still run all of the simulations on it under Fusion.
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Old 19th November 2009, 05:23 PM   #527
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I've got an extra pair of ff85k's, and also a couple of plate amps... My main amp is low powered SET, so I think I'd have to use amps on the bass.
This looks like a cool project (since I have most of the parts). By amping the 15" speakers I'm going way off the original design this thread is about, but you might be able to answer this..

If going active for the bass, does all the resonance stuff for the bass speaker matter so much? (qts) Or is that more of a baffle geometry issue? I ask because a friend has a pair of 15" drivers w/ a big magnet, qts of .35, that I can have.
OTOH, those eminence are relatively inexpensive, so I can get them if needed...
I'd like to keep the baffle small (as small as the one the thread is about)
Thanks!

I'll add that what is confusing me, and I guess it's because it's OB specific, is the mention that the lower QTS drivers have a sharper low frequency roll off, when the specs for the drivers generally show the lower QTS drivers having a lower fs and frequency range. (at least for this speaker, and the other few datasheets I just looked at)

Last edited by wicked1; 19th November 2009 at 05:31 PM.
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Old 19th November 2009, 06:40 PM   #528
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The final response of an open baffle system is the convolution ogf the baffle response and the driver response... ie if the driver has a bump-up in response and the baffle is designed to have an equal & opposite bump-down, the combination will be flat.

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Old 19th November 2009, 06:57 PM   #529
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is there a calculator around in which I can plug the speaker params, baffle size, etc?
I searched and found references to one, but can't find it.
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Old 19th November 2009, 07:07 PM   #530
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MJK's sheets cover this off.

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