fountek fullrange speaker!

[sspeaker]

The fountek fullrange on the web:
http://www.fountek.net/products_fr_88ex.htm
I got 2 samples.


Interesting for the Specifications:
Voice Coil Diameter 25mm
Voice Coil Height 4.0mm
Voice Coil Former aluminum
Voice Coil Wire Copper ribbon
Number of Layers 1
Magnet system type Neodymium
Magnetic Gap Height 10mm
B Flux Density 0.88T
Bl Product 3.313Tm
Max Linear Excursion 3mm +/-

It's a underhung voice coil motor design!

More detail comming on.......

[sspeaker]

I install it to the IEC baffle,and mearsure it.

The fig shows step response and FR,and use MLSSA to get the CSD:

The CSD is a "stereophile like" style, use the blackman-harris window and 0.15ms risetime.
The driver install to a bassflex box,like it:

Now, run in......

[Francois G]

Is the decibel/watt figure a typo? Only 84.4 db/watt @ 1 M!

With a power handling of 15 watts the output level will be very low.

[régine's]

Ahhhh
no whizzer cone, hmmm good
looks very promising,
other details please
if , yes if, I'm moving to Shanghai end of year .........
that's the reason I'm a Fonken fan now
all others way too complicated
to build for a girl like me...lol

[seanzozo]

At about 35 bucks (according to a russian Fountek site)...this seems like a good deal. The drop in the 7K region should make it nice and relaxed.

The inefficiency could be seen as a benefit in use on an OB. I think this plus an augie (3db more efficient) on OB would make a nice speaker ala martins OB.

Sean

[b_force]

How does this driver perform off-axis ?

(eg simulair to the tangband w3-871 or omnes audio bb3.01 ? )

[Poindexter]

I'm having a hard time finding a supplier for this driver.  Everybody carries the ribbon tweets, but nobody has the little fullranges (ex-ranges, actually; 110Hz up is not fullrange).  Yes, it's cold, but a 4-array would do okay, about 91dB; so it's down to cost per, which I have not been able to find.

Poinz

[b_force]

The only shop I can find is bmm electronics. But that's a shop from the Netherlands.
I think the shipping costs will be very high to the US.

I wonder if the tolerance of the parameters would be better than Tangband.

(I measured some W3-871s, and the VAS, for example, is 0,88. The VAS from the datasheet is 1,66)

[Poindexter]

How many W3-871s did you measure?  And, were they pretty tight to each other, or all over the place?

Thanks,

Poinz

[b_force]

I measured two of them and a friend 4 tangbands.

We lost the exact paramters of the last 4, but we have the standard parameters (Fs, Re, and Qts)

See the tekst file.

Soon we'll measure the T/S again for better results.