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Old 23rd April 2008, 05:46 AM   #31
hm is offline hm  Europe
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Hello,

"225 specs are very close to 206"

I donīt think so, the K serie has the lowest Xmax
0,3 mm only and the 125 only 0,15 mm, every
simulation shows thatīs not enough for 0,3 W,
may be enough for householt noise level,
take a measurement and donīt trust the Fostex
catalog measurements, take a distrotion measurement
at 1 W and compair it to other speakers same enclosure.
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Old 23rd April 2008, 07:28 AM   #32
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They've got way more excursion in practice -I've taken several of the damned things apart. Xmech is as good as any of the equivalent FExx6/7E units & irrespective of that, audible distortion starts at similar SPLs. Which is what matters. Very low harmonic distortion too (for an FR unit).
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Old 23rd April 2008, 07:48 AM   #33
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Hello,

Xmech has nothing to do with sound, only for damage,
make a measurement and show us ,
over Xmax distortion is rising rapidly.
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Old 23rd April 2008, 10:27 AM   #34
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Actually, it does have something to do with sound: it shows how hard you can ultimately crank the driver with safety (whether you'd actually want to or not depends on how mad you are ). My point was that it actually has plenty of excursion in hand, it's well built so it's not about to fly to pieces, and irrespective of the published parameters, the FF series do not audibly appear to distort any earlier, the conclusion being that they overload relatively gradually rather than abruptly, as can be the case with other units (the 166 springs to mind). Sure, they aren't PA drivers, but unless you're planning on trying to drive a ballroom at live Motorhead levels, they do rather nicely. Nelson & the late Terry Cain appear to have a similar take, so it's not just a personal view. Try listening to a pair if you get chance -FWIW, my favourites are the 165 & 225. Quite neutral in FR balance (see Nelson's measurements), no whizzer phase issues & dispersion issues, making them useful for smaller rooms in particular.
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Old 23rd April 2008, 02:09 PM   #35
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Quote:
Originally posted by Scottmoose
.... My point was that it actually has plenty of excursion in hand, it's well built so it's not about to fly to pieces, and irrespective of the published parameters, the FF series do not audibly appear to distort any earlier....
It is my impression that Fostex drivers are underhung with progressive suspensions. There is no way to drive them to Xsus under real life circumstances. You can burn them out with too much power, but you can't bottom them out. What happens is you get soft clipping and dynamic compression when you exceed Xmax.

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Old 23rd April 2008, 02:37 PM   #36
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Yup. That's about the size of it.
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