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Old 16th November 2012, 11:40 PM   #21
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Originally Posted by chrisb View Post
Click the image to open in full size.
is there any more info on this design floating around? it looks awesome.
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Old 17th November 2012, 12:07 AM   #22
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I'm not sure a series cross over makes it all that simple... Not having actually done much with series, just thinking here, a series cross over MAY not be as sensitive to the impedance peak, but isn't immune. It's also subject to the woofer filter. Am I missing something here?

I should add, it may work perfectly first order, depending on how things work out. It's just not as simple as making it series makes it work, afaik.
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Old 17th November 2012, 12:22 AM   #23
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It's just not as simple as making it series makes it work, afaik.
True. But XOing in the region where both drivers have minimum impedance seems to be ideal for a 1st order series. There is also lots of room for adjustment by changing the size of the parts... the XO point tracks all the time, but the nature and shape of the hand-over is malleable.

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Old 17th November 2012, 12:25 AM   #24
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is there any more info on this design floating around? it looks awesome.
Not at this time. It is a 1st pass design (but based on work done previously and another example of FASTs to encourage peopel -- if it works you can actually buy the drivers thou), as drawn it doesn't even have the right bass drivers in it (but they are drawn to scale).

The box is the same mT trapezoid as the EL70 fits into and uses the FF85wKeN is all i will say at this time. It is in Chris's queue to build.

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Old 17th November 2012, 01:30 AM   #25
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neat
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Old 17th November 2012, 01:34 AM   #26
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Based on the mention of Tysen, here is the thread from 2009. A thread for Tysen and variations on FAST

Lots of good info there as well for anyone interested in the subject of this thread.
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Old 17th November 2012, 10:44 AM   #27
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From the thread above, here's the impedance sweep of the 3" driver in free air, and an aperiodic transmission line.

Click the image to open in full size.

Chris
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Old 17th November 2012, 03:32 PM   #28
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Thanks Chris. I haven't read through the Tyson thread beyond the first page or so. Probably some good info I need to look at in there.
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Old 17th November 2012, 08:45 PM   #29
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Quote:
Originally Posted by planet10 View Post
. It is in Chris's queue to build.

dave


for which he might need a bass driver in hand to confirm dry fits, particularly of the bracing

Ryan:

did I happen to mention that the very successful MTMs with FF85K was a series XO?
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Last edited by chrisb; 17th November 2012 at 08:48 PM.
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Old 18th November 2012, 12:40 AM   #30
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Yes I was aware of that and it was single order electrical and I did hear it and it was very good.
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