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Old 17th September 2012, 03:23 PM   #1
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Default fostex fe83en//ff85wk questions

what is the freq.range, within which fostex fe83en or ff85wk excel? i need to know the crossover points for these drivers on both the ends.
are these both drivers good as tweeters? or tweeter/super tweeters are required to cover the highs say upto 20khz?
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Old 17th September 2012, 04:22 PM   #2
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FF85wk reaches up to something like 25k, it makes a really decent tweeter. Not so much the FE83.

At the low end, at limited volume you can squeeze 85-90 Hz out of the FF85wk. The FE83 has almost an octave less reach. These differences are reflected in the efficiency.

At fiyFEST the FF85wk did well with a 1st order at 160 Hz. To plump up the midbass (and allow for an attempt at a passive XO) i'm gonna try 240 Hz next

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Old 17th September 2012, 04:25 PM   #3
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-Depends what you mean by 'excel'

-That depends on what slopes you're planning on using, what other drivers you are planning on using, the baffle dimensions and shape, and your requirements for the resulting end system. It's not quite as simple as just picking X frequency & using that for whatever order slope you want, since the changing impedance of the driver becomes, or may become, a significant factor, particularly with low order slopes.

-Yes, they've both got useful output to 20KHz on-axis and measure well, especially the 85, which is good for > 20KHz.

-Depends on what your requirements are in terms of HF dispersion. Both are good as wideband units go, but if you need considerable off-axis capability, they're not going to match a quality 3/4in dome or similar.

Last edited by Scottmoose; 17th September 2012 at 04:32 PM.
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Old 17th September 2012, 04:40 PM   #4
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Quote:
Originally Posted by planet10 View Post
At diyFEST the FF85wk did well with a 1st order at 160 Hz.
Scott's post reminded me that i didn't post the reference picture:

Click the image to open in full size.

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Old 17th September 2012, 04:42 PM   #5
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Quote:
Originally Posted by Scottmoose View Post
Both are good as wideband units go, but if you need considerable off-axis capability, they're not going to match a quality 3/4in dome or similar.
With the 3/4" dustcaps on these they aren't as far behind the tweeter as you may think.

BTW: how is Colin doing on yours?

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Old 17th September 2012, 05:44 PM   #6
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Good point.

If he's had chance to unpack them yet I'd be surprised since he's back in full time work for a while, & been busy on weekends finishing some orders off, but I've been surprised before.

Last edited by Scottmoose; 17th September 2012 at 05:48 PM.
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Old 17th September 2012, 09:27 PM   #7
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I thought the fe83en was for a back loaded horn.
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Old 17th September 2012, 09:29 PM   #8
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What makes you think that?
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Old 17th September 2012, 09:37 PM   #9
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Quote:
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I thought the fe83en was for a back loaded horn.
Hmm, based on published specs it's not suitable for a BLH except of the Voigt pipe variety such as the BIB.

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Old 17th September 2012, 09:42 PM   #10
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And it's not going to be a long one of those either...

TBH, based on the published data, I'm honestly struggling to understand what they were trying to do. It'll make a good mid-tweet, but that's about it. Maybe 2 litres, sealed, for desktop monitor use?

Last edited by Scottmoose; 17th September 2012 at 09:45 PM.
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