Fostex Speaker Model. Part Number. ” FULL RANGE, FFK. • ” FULL RANGE • KENAF paper/ fiber composite cone • Foam surround • 94db sensitivity. Features. ♢mm ( in) cone type full range. ♢8 ohm impedance. ♢fo to17kHz frequency response. ♢94dB sensitivity at 1W/1m (ft). ♢kg ( lb) net. I’m planning to use a Fostex FFK as mid/high driver together with a Fostex tweeter and Beyma woofer. Active x-over between de Beyma.

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Well, not the same as what you have in mind. Posted by zobsky yahoo. Magnetically shielded, they also make great computer speakers. Fosyex made all my reservations this weekend. Anyway, but after fine tuning with stuffing inside and around the whizzer cone and placement the result is stunning and no kidding here.

Fostex FFK Full Range Speaker Woofer Loudspeaker

I can’t figure out what the FE Sigmas are doing but they look cool. Really looking forward to some big time fun. I have not tried or heard the E or E sigma. In any case, the FFK has 94dB sensitivity, works well as a full-range driver, betters its bigger brother in the treble but of course is not as good in the bass.

I would have assumed that the FEE Sigma was intended to be a direct replacement for the FEE, but the mid fosgex top end make me rethink that.

They are amazing drivers for the money. But in my TQWT they sound excellent. fostx

But very thing turn out great! I think the match of horn geometry and damping with these drivers is critical to making them sound right. Of course, this could be dependent on a less-than-optimal match with tf165k backhorn, but I suspect it also has to do with the driver’s higher Qts.

I like the Jordan so much I stuck it in here anyway as a fine counter example. Stock, it lacks some treble but this is easily improved upon. I think they are a bit too big for the driver, especially after reading the article about TL and pipe speaker in August 03 Audio xpress.


The FE series uses ‘whizzer’ cones to good effect and the FF series uses an aluminum center. Taken alone, it rolls off a bit much for my taste. I popped one of them in one of my cabs to do an A-B. I hooked up a 4 ohm SS amp and they were DOA, but with a amp with 8 ohm output, they were lively and nice.

They work well in my 8. They do have a tendancy to ‘shout’ if not properly implimented. The other horn cabinet was running my FFK which has been broken in for a month, Hope this helps, Marco.

FOSTEX FF165K Driver/pair

I’ve never seen a real curve of the LE 8 and I don’t remember that much about their top end. The size and shape of the chamber directly behind the driver will help in this regard.

I have also noticed that these drivers are very sensitive to gostex match of the amp, and possibly the kind of amp as well.

The ‘wooly’ bass response may be due to overly damping the horn throat, although too little may result in a midrange peak. I am currently listening through some Emotive Audio b monoblocks which have killer power supplies and now the faults I had attributed to the drivers like have seemingly vanished.

This is a very nice driver but I have to conclude that a ribbon tweeter or something similar would put the cherry on top. This one, however, needs some kind of tweeter and while I think the real maximum excursion is bigger than the spec, I would treat it gently with the “Jurassic Park” sound track. Fosgex notice that Fostex seems to have three approaches for getting full-range performance in the treble.

The 4KHz peak of the uncorrected driver is easily taken care off and it’s pretty inoffensive. It excels at one very difficult thing – to still sound good after the honeymoon is over. They sounded ok with 60 watt Sonus Faber amp but they love chip amps like 47 Labs Gaincard. We hope to see you at VSAC, since we have something [cool] to show you.


I was going to go with the 8″ Fostex but I don’t want bigger box and the 6.

However, it does have a more “wooly” and less tight bass. The FEE has maybe just a tad less bass but the FFK has been broken in for some time now and has also had some damping material wrapped around its ribs to absorb nasty reflections. I got the FEE in the mail late in the week. The reason I when for the E is because I didn’t want to lot of money on my first Single Driver atempt. As pointed out before, it appears that the high-efficiency drivers make the most out of a current source and here we don’t see any particular advantage.

Wanted – Fostex FFk Drivers

Hi Jay Sounds like my experience. Audio Asylum Thread Printer Get a view of an entire thread on one page. The difference is quite foztex. I think I am going to put the FFK in a little bass reflex cabinet and coupled with my dostex acquired radioshack supertweeters, should make for an interesting bedroom speaker.

The FEE seems to have a somewhat more “forward” presentation, with tighter bass a plus and some minor “shout” in the midrange a minus. These drivers love DHTriodes. You’ll notice here that the response curves are extremely similar.

See you there, Jay. Anyway, if you looking for a cheap way to get in to single driver than Fostex is the best way to go. It has 96dB sensitivity and if you bring in a good tweeter, maybe a nice ribbon above 5K, I think you’ll really have something.