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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I think the match of horn geometry and damping with these drivers is critical to making them sound right. However, it does have a more “wooly” and less tight bass.

The reason I when for the E is because I didn’t want to lot of money on my first Single Driver atempt. It excels at one very difficult thing – to still sound good after the honeymoon is over. I am currently listening through some Emotive Audio b monoblocks which have killer power supplies ff16k now the faults I had attributed to the drivers tostex have seemingly vanished. I would ff165kk assumed that the FEE Sigma was intended to be a direct replacement for the FEE, but the mid and top end make me rethink that.

Taken alone, it rolls off a bit much for my taste. The FE series uses ‘whizzer’ cones to good effect and the FF series uses an aluminum center.

You’ll notice here that the response curves are extremely similar. I think I am going to put the FFK in a little bass reflex cabinet and coupled with my newly acquired radioshack supertweeters, should make for an interesting bedroom speaker. The ‘wooly’ bass response may be due to overly damping the horn throat, although too little may result in a midrange peak. I hooked up a 4 fff165k SS amp and they were DOA, but with a amp fotex 8 ohm output, they were lively and nice.

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The FEE seems to have a somewhat more “forward” presentation, with tighter bass a plus and some minor “shout” in fosfex midrange a minus.

Stock, it lacks some treble but this is easily improved upon. But very thing turn out great! I’ve never seen a real curve of foxtex LE 8 and I don’t remember that much about their top end. 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 made all my reservations this weekend.

Fostex FF165K 20% off sale

Audio Asylum Thread Printer Get a view of an entire thread on one page. They do have a tendancy to ‘shout’ if not properly implimented. These drivers love DHTriodes. I have not tried or heard the E or E sigma.

Wanted – Fostex FFk Drivers

I notice that Fostex seems to have three approaches for getting full-range performance in the treble. Hope this helps, Marco.

But in my TQWT they sound excellent. 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.

In any case, the FFK has 94dB sensitivity, works foztex as a full-range driver, betters its bigger brother in the treble but of course is not as good in the bass. The 4KHz peak of the uncorrected driver is easily taken care off and it’s pretty inoffensive. Posted by zobsky gostex. Well, not the same as what you have in fosetx. Magnetically shielded, they also make great computer speakers.


They work well in my 8. The other horn cabinet was running my FFK which has been broken in for a month, I like the Jordan so much I stuck it in here anyway as a fine counter example. I was going to go with the 8″ Fostex but I don’t want bigger box and the 6. Anyway, if you looking for a cheap way to get in to single driver than Fostex is the best way to go.

The difference is quite startling. Anyway, but after fine tuning with stuffing inside and around the whizzer cone and placement the result is stunning and no kidding here. 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.

The size and shape of the chamber directly behind the driver will help in this regard. Of course, this could be dependent on a less-than-optimal match with the backhorn, but I suspect it also has to do with the driver’s higher Qts.

Really looking forward to some big time fun. 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.

I popped one of them in one of my cabs to do an A-B. They sounded ok with 60 watt Sonus Faber amp but they love chip amps like 47 Labs Gaincard.

I can’t figure out what the FE Sigmas are doing but they look cool.

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