FF85K replacement for µFonken ?? - diyAudio
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Old 6th September 2011, 09:31 PM   #1
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Default FF85K replacement for µFonken ??

I have a pair of µFonken cabinets that I started building a couple of years ago(gosh has it really been that long?) and I never bought drivers for them.

Is there a suitable or perhaps recommended alternative to the FF85K now that it is NLA?

Sorry if this has been extensively covered already.

-Josh
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Old 6th September 2011, 10:23 PM   #2
chrisb is offline chrisb  Canada
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Quote:
Originally Posted by jpbturbo View Post
I have a pair of µFonken cabinets that I started building a couple of years ago(gosh has it really been that long?) and I never bought drivers for them.

Is there a suitable or perhaps recommended alternative to the FF85K now that it is NLA?

Sorry if this has been extensively covered already.

-Josh

not extensively covered to death, yet - the FF85WK is the direct descendant, and for my money improvement over the prior model - in any case it'll work just fine in the same box
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Old 6th September 2011, 10:48 PM   #3
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Thanks Chris.

I kind of thought that might be the case but I have been out of the audio game for a little while.

-josh
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Old 7th September 2011, 01:00 AM   #4
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We've been evaluating FF85wk in apair of uFonken we had left (assembled from flat-pak). They work fine. An optimized version will likely have a slihtly wider vent spacer.

Seen Here at the left end in the middle row.

dave
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Old 7th September 2011, 02:38 AM   #5
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My cabs were made out of 3/4" solid pine instead of 1/2" ply.
I can't remember if I bothered to keep the port volume exactly the same or not.
So the center piece is already slightly thicker but the other measurements may be off.
-Josh
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Old 8th April 2012, 04:20 AM   #6
fakeout is offline fakeout  Canada
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Just in case this member is still here, did you finally install the FF85WK in those cabinets? Can you compare the sound with the HK you had in there? I mean did the HKs sound "incorrect" in a cab not designed for them? (The reason I'm asking is because I found a plan for a Omnes Audio BB3.AL which I read is similar but not exactly the same as the Veravox 3X. And the manufacturer of the Veravox 3X told me the plan "should be OK".)
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Old 8th April 2012, 04:37 AM   #7
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It's not because two somewhat similar drivers may by coincidence work well in one cab; that two other somewhat similar drivers would work well in another cab.

In general if core parameters (say, Qts, Vas, fa, possibly xmax) do not differ too much it MAY work but you cannot assume anything when it comes to speaker design...

In your case, unless you want to design from scratch, it seems that you'll just have to try the alternative enclosure and see.
(Edit): did you mean this design:
http://ebmule.de/showthread.php?tid=2078

Personally I'd put the bass reflex mouth in the front.
And use a terminal for bi-amping (2 pairs of connectors): connect the black ones to the - connector of the speaker, and one red one directly to the + of the speaker and the other one first through the correction filter of the design. Then you can easily switch between "direct" and "flattened" frequency response by replugging the red cable.

Last edited by talaerts; 8th April 2012 at 05:04 AM. Reason: added link
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Old 8th April 2012, 04:46 AM   #8
brsanko is offline brsanko  United States
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From what I have seen the new models of Fostex drivers are close enough in specification to the models they replace to work well in cabinets designed for the older ones.
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Old 8th April 2012, 05:29 AM   #9
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So far, with the exception of the FF85wk, we have found the new ones require smaller miniOnkens, but will drop into existing Mets & Changs, but thise can be optimized. The new FE series is pretty close to the old ones.

dave
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Old 8th April 2012, 06:09 AM   #10
zman01 is offline zman01  Bangladesh
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Quote:
Originally Posted by talaerts View Post
And use a terminal for bi-amping (2 pairs of connectors): connect the black ones to the - connector of the speaker, and one red one directly to the + of the speaker and the other one first through the correction filter of the design. Then you can easily switch between "direct" and "flattened" frequency response by replugging the red cable.
Talaerts,

+1, That's a simple but really good idea for testing out alternative configurations.
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