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Old 11th October 2006, 07:12 AM   #1
bfard is offline bfard  United States
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Default Sonus Faber Extrema

I'm thinking to start building a Sonus Faber Extrema Clone. Does anyone have any information on these beautiful speakers? Has anyone seen a clone project on them? I would appreciate any help.

Thanks,

bfard
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Old 11th October 2006, 04:10 PM   #2
DeonC is offline DeonC  South Africa
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Hi bfard

The tweeter is a Dyanaudio Esotar (unfortunately not available anymore) and the woofer was a custom design builty by Skaaning (you can buy their woofers or have them built for you, so it is almost impossible to gestimate the specs). On the back was a passive radiator which was a normal driver of it's own, or so I think- you could adjust the damping to the PR, so I suppose this was simply done with resistors in series to the VC. This is about all I do know about it, so good luck. A very ambitious project if you ask me.

Enjoy,
Deon
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Old 11th October 2006, 04:36 PM   #3
Gasho is offline Gasho  Croatia
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SF Extrema was a beautifull project and for me SFs best speaker ever.

It have lameled enclosure (like Kharma speakers) , tweeter was Dynaudio Esotar D330 , bas driver vas custom Skaaning (Audio technology) 8 inch Flex unit with long gap-short coli 2 inch voice coli.

At back of speaker was B139 KEF driver that was acting as passive radiator. B139 voice coil was shunted with various value power resistors that are selected by rotari swich on back of speaker.
It acts like Qfactor adj. of bass system.

Crossover is first order design around 2KHz.
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Old 11th October 2006, 04:50 PM   #4
fgroen is offline fgroen  Netherlands
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Check out this topic (Visaton-Cremona style
) on a Dutch DIY forum. Don't mind the drivers, these are Visaton. However, the cabinet building probably will provide you with sufficient ideas.

Unfortunately, the langueage is Dutch, but the generous amount of pics makes up for that.

Check this out as well:

Pics French Cremona clone project (other construction method)

However, I don't have info on original driver choice and filter setup. I know that SF uses Mundorf Supreme caps.
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Old 11th October 2006, 05:48 PM   #5
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Default Grilles

fgroen - if I may do a tiny little "butt-in" here - do you have any idea what the grilles are on those clones/how they're made, etc? I didn't read the first link so if the info is there let me know; I also didn't look at all the pics on the second link. I'm thinking of doing some grilles like that on some speaks I'm planning on building next year - either vertical bars or a hexagrid screen.

Those are beautiful speakers for sure.
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Old 11th October 2006, 08:16 PM   #6
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fgroen,

I bet you must get tired of compliments on your speakers, but those are REALLY impressive.

Gert
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Old 11th October 2006, 08:43 PM   #7
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Quote:
Originally posted by Gasho
Crossover is first order design around 2KHz.
Yes, and there is only 3 components. Two coils and one resistor. The woofer has a big coil and the tweeter has first a series resitor (~20Ohm says stereophile) to pad it down and to give impedance for the parallel coil which is the high-pass for the tweeter.
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Old 12th October 2006, 12:22 AM   #8
bfard is offline bfard  United States
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All,

Thanks a bunch for the information.


fgroen,

Outstanding job! Wow!

Bobby
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Old 12th October 2006, 09:22 AM   #9
fgroen is offline fgroen  Netherlands
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Guys, thanks for the compliments, I will forward them to the rightful person. He's a Dutch guy like me, named Frank.

I do love the Sonus-Faber looks, but I'm currently engaged in an Avalon-like speaker. Not a clone, but my own design. When I was halfway the project Mr. Patel came up with the Isis, that uses the same speaker unit selection as my project. Difference is that the Isis has two woofers where I have one, and I started off with the Ceramic version of the tweeter where the Isis obviously has a diamond tweeter. He's such a copy cat!

Here's a pic of my project in a recent stage. (also popped up in some other threads)

Click the image to open in full size.

As for the grilles on that French website: One of the pics shows a machined block of aluminium with little holes.

Click the image to open in full size.

He probably glued in steel rods on both ends and fixed the blocks to the cabinet somehow. I don't know how difficult it is to remove and replace these grilles.

Click the image to open in full size.

Click the image to open in full size.

He CAN remove them...
Click the image to open in full size.

I'm checking out his site a bit, but for the moment can't find more info on the Cremona's. There are only pics of the Cremona's but no link on his homepage for further info.
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Old 12th October 2006, 09:51 AM   #10
AuroraB is offline AuroraB  Norway
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Re: Cremona Grille

It's not steel rods ( which I think would ring) but rubber bands,-
can be bought by the meter, to make O-ring seals.
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