Well, I notice that it has an enormous peak at 7 khz. It wouldn't surprise that you'd hear some hardness in the treble.
The FF85K has its peak at a more distant 10khz however:
This one in a FAST system could be interesting, in my (very humble) opinion.
yeah - the price increases don't help things on my end. Looks like there's no getting around a K-tube helper tweeter for the 6"& 8" if I use them in Karlson type.
FOSTEX FE206EN
NEW FOSTEX FF225WK
FOSTEX 166EN
FOSTEX FF165WK
FOSTEX FE206EN
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NEW FOSTEX FF225WK
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FOSTEX 166EN
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FOSTEX FF165WK
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I like the idea of the FAST for the older FF85K - what might make a competent/cost effective new woofer (& passive xover?)
Well, EBP = Fs/Qe at any rate. It's a highly generalised guideline that Small (IIRC) came up with; so generalised that I ignore it.
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I was just looking at woofers for such a project.
The affordable Tang Band W5-704D could be interesting. It is quite wide range in itself. In a box of 17 to 20 litres it reaches below 40 hz with enough sensitivity.
Making a good filter is an art however, of which I have only a bit of experience, so take the following with a few bags of salt.
Here I would prefer to cross pretty low, say 300 hz, and put the FF85K in a closed compartiment (which helps the bass attenation of the fostex).
Since both are around the same sensitivity, I would first try to connect only a capacitator to the fostex for a -6db filter. PRoblem is that you then need a big capacitator, which should as well be as transparent as possible. I would experiment with filtering the woofer. Perhaps start only with a coil (which will need to have a core at this low frequency), then try a higher order filter for it.
People like ScottMoose can perhaps weigh in with suggestions.
Dave did something similar with his Tysen boxes, albeit with different woofers & the 85 in a mid-TL.
there has to be very little rise in the impedance for a capacitor to work well without causing the fullrange excursion to go up beyond that of no highpass at all in that resonance region. I wouldn't splurge for huge film caps. A choke across FF85 might be a livable compromise.
Indeed ,BWP is more important in amplifiers ..🙄
But ,at first sight , little paper cones are likely to have less moving mass ,and accordingly to their diameter ,they 'beam' less ...
If we can assume the same measure condition (graphs don't look near as smoothed), the 7k peak is not near as dramatic as on FE126/7e. They managed to do a good job on it in the FE126En.
The 10k on the FF85 is not that big. Should be managable. I'm hoping it meets or exceeds the previous gen which was a seriously good driver. I bemoan the loss of the UDR surround, but we will see.
dave
Tysen: FF85KeN + SDX7eN PLLXO @ 333 Hz, 2nd order HP, 1st order LP.
My Proper MTM (no formal name yet): FF85Ken + 2 CSS EL166, 1st order series passive somewhere 3-400 Hz (30uF, 3 mH still needs tweaking maybe)
dave
thanks Planet10 - did you play with the cheaper 8" SEAS driver? - just wondering if its a kontender
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Allright, when does Solen get them, I hate paying for shipping? 😉
Looks like fun overall. They did move away from horn-friendliness, but the new line seems to be quite versatile at least. Quick screwing around in WinISD shows FF225WK being at home in both sealed and vented enclosures. A ~80l EBS scheme might be fun. Might also work decently in a Karlson K12.
IG
Looks like fun overall. They did move away from horn-friendliness, but the new line seems to be quite versatile at least. Quick screwing around in WinISD shows FF225WK being at home in both sealed and vented enclosures. A ~80l EBS scheme might be fun. Might also work decently in a Karlson K12.
IG
How so? I mean if I were interested in building some BLHs, the FF85WK is ~ideal for a ~40 Hz alignment and it wouldn't even need a corner. The rest can be misaligned somewhat to work, they just will need either a short front horn or at least a wide baffle to best blend through the acoustic XO BW.
The downside is that some of these new drivers aren't particularly SET tube 'friendly', and worse, none are for a matching impedance, a prerequisite IME for best performance overall with a 'FR' driver in the mids-up BW.
GM
My last Fostex buy was some time ago but the box was marked China. Not to rain on anyone's parade but if the current run of Fostex are made in Japan, what are the chances of radiation on 'em?
I'm looking forward to getting the Fostex 126en as a replacement unit for one I was tinkering with. Could someone report when they get their delivery of same the manufactured point of origin?
I'm looking forward to getting the Fostex 126en as a replacement unit for one I was tinkering with. Could someone report when they get their delivery of same the manufactured point of origin?
Don't know about all of their product lines, but the small prosound stuff being used in some trade show booths back in 2002 was from China [sounded horrible at the levels used].
Considering where you live, I'd be a whole lot more concerned about a Northerly wind than what the USA Customs lets in........😱 NRC: Operating Nuclear Power Reactors (by Location or Name)
GM
As Robin Williams said, 'Shakespeare now! A play, based on the reactor accident at Three Mile Island, entitled "A Meltdowner's Nightmare."' 
I think this may come under the definition of 'excessive caution.' 😉
-Aside from special editions, Fostex production is TTBOMK entirely China based now.
-Japan is hardly likely to allow irradiated goods to be sold on the international market.
-The various nations to whom product is exported are hardly likely to allow irradiated goods through their borders, let alone be sold to the end-consumer.
-Only a small area around the Fukushima plant currently has a severe radiation problem, and the situation is reported to be steadily improving.
-The majority of the radioactive material released has an extremely short half-life. As in measured in a few weeks.
-Based on my limited knowledge of nuclear weaponry from teaching naval history / strategy, assuming the drive units had been constructed within a couple of hundred miles of the Fukushima plant, I would estimate the maximum additional radiation to be roughly equivalent to you spending half an hour cutting the grass in your garden on a moderately warm day. Once. Note that that is an absolute worst-case estimation.
I think this may come under the definition of 'excessive caution.' 😉
-Aside from special editions, Fostex production is TTBOMK entirely China based now.
-Japan is hardly likely to allow irradiated goods to be sold on the international market.
-The various nations to whom product is exported are hardly likely to allow irradiated goods through their borders, let alone be sold to the end-consumer.
-Only a small area around the Fukushima plant currently has a severe radiation problem, and the situation is reported to be steadily improving.
-The majority of the radioactive material released has an extremely short half-life. As in measured in a few weeks.
-Based on my limited knowledge of nuclear weaponry from teaching naval history / strategy, assuming the drive units had been constructed within a couple of hundred miles of the Fukushima plant, I would estimate the maximum additional radiation to be roughly equivalent to you spending half an hour cutting the grass in your garden on a moderately warm day. Once. Note that that is an absolute worst-case estimation.
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