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Old 2nd May 2012, 12:37 PM   #11
IG81 is offline IG81  Canada
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The newest FF series sure gets a lot of talk, whereas the old one was taking a major backseat to FE. I own both FF125K and FF225WK, like them both in the applications I have them in. I would have liked to get some FF225K though. Long live big magnets!

IG
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Old 2nd May 2012, 05:23 PM   #12
inrank is offline inrank  United Kingdom
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Anyone know what size enclosure this is for the FF166en? a DBR?

Click the image to open in full size.

???????????????
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Old 2nd May 2012, 08:36 PM   #13
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That box/driver/port combo looks to be about right for the Fostex 167e... not the 166e. I have a box like that for the older style (with whizzer) 168z and it does provide a nice bouncy (maybe even a bit bloated) bass.
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Old 2nd May 2012, 08:55 PM   #14
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I agree with Jeff, FE166 is not suited to a BR (if you want any bass)

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Old 22nd March 2013, 02:40 AM   #15
howardg is offline howardg  United States
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Default advice on Fostex FF85WK as a midrange please

Hi, quite new here, though I have often found useful and interesting talk here as a passive participant.

I want to use a Fostex FR driver for a midrange in a new 3 way. Considering the FF85WK. Wondering though about the lowish 86db efficiency and 5 watt power handling.

I have had good results using circa 2008 Fostex FE126e as a midrange in a 3 way between circa 1970 JBL LE14a and circa 1980 EPI inverse dome tweeter. The pair did very well in the PNWAS speaker contest, with much of the credit rightly going to our local crossover prodigy D.R. (I don't know his handle here)who designed the crossover after patiently corresponding and testing my drivers.

Planet10 has the respect of members of our local DIY club, so I look with interest at his choice of the FF85WK as a winner for smoothness. In my previous design, the roughness/peakiness in the FE126e was largely designed around in the crossover, crossing over to the EPI tweeter around 4500 hz.

I wonder if the FF85WK crossed over at 500/5000 hz would handle enough power to match the volume of a JBL LE10a woofer--- and would it be efficient enough? In the previous design, we had to bring the 93db FE126e down with a 20ohm resistor, to match the LE14a woofer. I think the LE14a(90db) is nominally 1 db more efficient than the LE10a(89db) that I now want to use. But the FF85WK is only 86db efficient, according to sales info online.

Any feedback/ideas?

Very little out there about using these old JBL woofers in 1/4 wave pipes, but if my experiments with the LE 10a in a folded version of a mass loaded TL(?)(like the C and C "Abbey") are successful, I will let you know. I got very low bass from an LE8t a few years back---actually measured in the 20hz region---but may have been due to anomalies of the testing environment.

Thanks!
Howard
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Old 22nd March 2013, 05:41 AM   #16
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You want the woofer to be more efficient than the mid -- by enuff to cover BSC (with XO near (at or under) the BS F3). I am currntly listening to a smallish 2-way with 85wk + a pair of Silver Flute W14.

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Old 22nd March 2013, 12:36 PM   #17
IG81 is offline IG81  Canada
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With this 14" woofer, you will not be hitting a baffle-step frequency much above 300Hz. FF85WK's tiny Xmax is easily exceeded with a few watts of power, even high-passed at 300Hz, so it depends on how loud you need things to get on that system. Owning a pair of FF85WK, they still sound clean to me with excursion beyond Xmax (do we know how Fostex specifies this figure - 0.707*BL maybe or XX% THD?). High-passing at 500Hz is already a big improvement and allows for a lot more power, ~16W to hit Xmax. Maybe you can tweak the crossover's low-pass leg to fake some early BSC on the woofer and still have both drivers meet correctly.

IG
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Old 22nd March 2013, 04:54 PM   #18
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howardg,

Did you look at the FE103en? I just bought a pair of these & find them much to my liking. I also have used FF85k (older version of the FF85) in three projects and find them extremely nice. That said, the 103 is a nice smooth driver w/o (as far as I can tell) the peakiness of the FE126, and it can play a bit louder than the FF85.

Cheers, Jim
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Old 22nd March 2013, 07:49 PM   #19
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Hi Jim Shearer,

There is so much to love about the 103 (tone-wise) with none of that peakiness found in the 126. I believe you also have some Mets with the FE108E-Sigma and either FX120 or F120A if I'm not mistaken? At some point, I'd love to hear any comparisons you have.

(I've made my own comparisons, but would love to hear yours because I love all those drivers, but each for different reasons -- but at the moment, the 103 plus a Bottlehead SET is the best system I've managed to assemble, for my taste or lack thereof!)
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Old 22nd March 2013, 08:20 PM   #20
howardg is offline howardg  United States
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Default Thanks for the thoughtful responses!

Kind of dumb that I didn't notice that I was in the single driver forum. I have quite a bit of interest in this area though. Previous successful builds include an FE126 in what amounts to a wave type horn-similar expansion to CHEAP TRICK, HORNSHOPPE(from what can be eyeballed online) and others---that ended up having a closed down mouth and became kind of a mass loaded horn----in that it retained it's compression chamber and expansion geometry but lost 2/3 of it's mouth size. This happened while experimenting to fill in a 4db lull around 160hz---it worked. They ended with a somewhat more resonant pipe like character, but lots of bass for a 4.5 93db driver. Also made a wave horn (not mass loaded) with an FE206e and an 8 SEAS PR on the back side of the compression chamber, in which the horn and the PR each effectively contribute to the bass output.

Dave, Thanks for the guidelines on relative woofer/mid efficiency and woofer BS considerations. It sounds like the 3db difference between the woofer and the mid would be about right. Also hopefully the MLTL-like design will bring up the lowest octave.

IG81, My writing was probably a bit confusing, but I want to use the 10 LE10a in this new design. That should help a bit. I think JBL ran this woofer without low pass filter in the L77 of the 1960's so it may do fine crossed over kinda high-but somebody may know better than I about that.

Jim, I have looked at the fe103. My recent interest in the FF series was prompted by positive comments from a friend at our club who was sharing his older (discontinued) ENABLED FE127s in nice looking resistive-slot ported bamboo cabinets. He felt the FF series to be a step up from the older FE line. But I am curious about the FE103. I also have been looking at the higher priced full ranges from CSS(still reasonable) and the MARKAUDIO line(though I think I would tend to use these for something other than an expensive midrange). Part of the fun of this stuff is making something nice for little money. The 14 3 way ended up with a crossover that rivaled the price of the drivers-the drivers being old.
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