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Old 7th November 2016, 02:17 PM   #1
S4m is offline S4m  Germany
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Default uFonken - Fountek FE85

Hey guys,

The days are getting darker and colder so more time for cutting wood
For the beginning my wife told me it would be nice to use some
of the speakers lying around - collecting dust.

I have 2x matched pairs of the Fountek FE85 by my hand and didn't know what to do.

I tried a bambus-vase from a swedish furniture-store with more or less good results.
I'm always stmbling across the Fonken enclosures but the small midrange speaker is a bit too tiny.
In the past i put a pair of the Founteks in a FHlite but the AuraSound NS3 is IMHO the better choice.

So i thought give the µFonken a try; the facts:

Fostex FF85wk | Fountek FE85
Vas: ~1 l | 0.85 l
Fres: 115 Hz | 125 Hz
Qms: 3,3 | 2,13
Qes: 0,68 | 0,67
Qts: 0,55 | 0,52

Ok, before someone is throwing rocks, both drivers are not the same.
I know i cannot replace one with the other without some flaws...
I got an old simulation software and the results are more or less fine.
The Fountek can be placed in a 2 l BR enclosure and the dimension of two BR ports are nearly the same.

I started the experiment with cheap but acoustically not so bad OSB-board.
16mm are more than enough, the speakers are tiny so big issues with resonances are not expected.
With the additional 4mm thickness on each side i have more room for some chamfering.

I will make some progress in the following days, and before the first questions are coming up, sorry but no measurements.
I tried it in the past and my room is horrible and come on it's not highend it's just for fun.

No pic, no truth - see attachment
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Old 7th November 2016, 04:37 PM   #2
planet10 is offline planet10  Canada
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uFonken - Fountek FE85


The parameters are fairly close, people have been happy using drivers that are a lot further away.

dave
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Old 7th November 2016, 06:00 PM   #3
S4m is offline S4m  Germany
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Update
I have a good feeling with the Founteks in the uFonken.
If these perform nearly as good as i hope they will,
i will built a second pair with additional Fountek 3.5h ribbons.
A bit higher enclosure but inside the same dimensions.
Some nice woofers are also waiting in a corner, probably a slim sidewoofer
enclosure as a stand for the small uFonkens... Will see how this ends :-D
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Last edited by S4m; 7th November 2016 at 06:02 PM.
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Old 8th November 2016, 01:06 AM   #4
chrisb is offline chrisb
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I hope your assembly photos mean the parts are only dry-fit together to confirm correct sizes: you absolutely need to chamfer or radius the rear side of speaker mounting hole with drivers of this size, and that's a lot easier to do before gluing the front panel in place - maximum of maybe 10 seconds each with a small laminate trim router and 45dg bit.
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Old 8th November 2016, 09:33 AM   #5
S4m is offline S4m  Germany
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Hi Chris,

You are right with your statement and thanks for your tips

One sidepanel and the front is at the moment not glued with the other parts.
It's only easier with the clamping, that everything is in a correct angle and fit.
I hadn't the time to start the router for embedding the speakers in the front and the back chamfering.

If the experiment is working well i will do a rebuild with bb plywood.
This build with the OSB is only to see if it's worth to use the Fountek instead of the Fostex.
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Old 12th November 2016, 03:55 PM   #6
S4m is offline S4m  Germany
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And here it is

Some instrumental rockmusic is now used for "breaking in" and tomorrow they get some heavy tunes at higher volume
For today i'm really satisfied with the results.
These little fellows build up a great soundstage.

Of course they are limited in the lowend but i'm more or less amazed how good they are.
The upper frequency part is also limited so maybe i will make a tweeter extension.

For desktop use they are absolute great. Enough lowend and treble to keep them how they are. And what i have seen they can get reallly loud...!
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Old 12th November 2016, 05:18 PM   #7
chrisb is offline chrisb
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what's the turntable?
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Old 12th November 2016, 07:53 PM   #8
S4m is offline S4m  Germany
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Oh that's a pro-ject rpm 1.3. nothing special but fits my needs. The motor is separated from the chassis. The needle is a simple Ortofon red 2m.
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Old 12th November 2016, 09:02 PM   #9
chrisb is offline chrisb
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enjoy
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Old 13th November 2016, 09:07 PM   #10
S4m is offline S4m  Germany
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Thanks Chris. They are playing the entire day with an subwoofer in addition.
I'm really pleased. Will buy some plywood tomorrow and rebuild them in a more precise way ;-)
Have a good start in the week! Greetings from the other side.
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