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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They sounded ok with 60 watt Sonus Faber amp but they love chip amps like 47 Labs Gaincard. 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.

This is a very nice driver but I have to conclude that a ribbon tweeter or something similar would put the cherry on top. But very thing turn out great! Stock, it fosrex some treble but this is tf165k improved upon.

Anyway, but after fine tuning with stuffing inside and around the whizzer cone and placement the result is stunning and no kidding here. 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 fodtex Park” sound track. But in my TQWT they sound excellent.

WANTED: Fostex FFk full range drivers

The other horn cabinet was running my FFK which has been fkstex in for a month, However, it does have a more “wooly” and less tight bass. 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. Taken alone, it rolls off a bit much for my taste. The ‘wooly’ bass response may be due to overly damping the horn throat, although too little may result in a midrange peak.


I think fv165k match foste horn geometry and damping with these drivers is critical to making them sound right. 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.

I popped one of them in one of my cabs to do an A-B. The 4KHz peak of the uncorrected driver is easily taken care off and it’s pretty inoffensive.

Hope this helps, Marco. The difference is quite startling.

You’ll notice here that the response curves are extremely similar. I made all my reservations this weekend. Audio Asylum Thread Printer Get a view of an entire thread on one page. I have also noticed that these drivers are very sensitive to impedence match of the amp, and possibly the kind of amp as well. I am currently listening through some Emotive Audio b monoblocks which have killer power supplies and now the faults I had attributed to fostfx drivers like have seemingly vanished.

The reason I when for the E is because I didn’t want to lot of money on my first Single Driver atempt. 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.

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. I can’t figure out what the FE Sigmas are doing but they look cool. We hope to see you at VSAC, since we have something [cool] to show you. Well, not the same as what you have in mind. 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.


Fostex FF165K 20% off sale

They work well in my 8. I’ve never seen a real curve of the LE 8 and I don’t remember that much about their top end. The FE series uses ‘whizzer’ cones to good effect and the FF series uses an aluminum center. I like the Jordan so much I stuck it in here anyway as a fine counter example. Really looking forward to some big time fun. The FEE has maybe just a tad less bass but the FFK has been broken in for some time ff165, and has also had some damping material wrapped around its ribs to absorb nasty reflections.

I got the FEE in the mail late in cf165k week.

FOSTEX FF165K Driver/pair

I ff15k that Fostex seems to have three approaches for getting full-range performance in the treble. 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. These drivers love DHTriodes. It excels at one very difficult thing – to still sound good after the honeymoon is over.

Hi Jay Sounds like my fistex. They do have a tendancy to ‘shout’ if not properly implimented.