Sonus Faber Extrema

bfard · 11th October 2006, 06:12 AM

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

DeonC · 11th October 2006, 03:10 PM

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

Gasho · 11th October 2006, 03:36 PM

SF Extrema was a beautifull project and for me SF´s 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.

fgroen · 11th October 2006, 03:50 PM

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.

sdclc126 · 11th October 2006, 04:48 PM

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.

gbyleveldt · 11th October 2006, 07:16 PM

fgroen,

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

Gert

Landroval · 11th October 2006, 07:43 PM

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.

bfard · 11th October 2006, 11:22 PM

All,

Thanks a bunch for the information.

fgroen,

Outstanding job! Wow!

Bobby

fgroen · 12th October 2006, 08:22 AM

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)

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

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.

He CAN remove them...

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.

AuroraB · 12th October 2006, 08:51 AM

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.

11th October 2006, 06:12 AM	#1
bfard diyAudio Member Join Date: Sep 2006	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

11th October 2006, 03:10 PM	#2
DeonC diyAudio Member Join Date: May 2002 Location: Kimberley, South-Africa	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 __________________ Reality is not digital, an on-off state, but analog. Terry Pratchett - Moving Pictures

11th October 2006, 04:48 PM	#5
sdclc126 diyAudio Member Join Date: Jan 2005 Location: San Diego, CA	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. __________________ Soft Dome

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11th October 2006, 03:36 PM	#3
Gasho diyAudio Member Join Date: Nov 2004 Location: Zagreb	SF Extrema was a beautifull project and for me SF´s 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.

11th October 2006, 03:50 PM	#4
fgroen diyAudio Member Join Date: Nov 2005	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.

11th October 2006, 07:16 PM	#6
gbyleveldt diyAudio Member Join Date: Jun 2006	fgroen, I bet you must get tired of compliments on your speakers, but those are REALLY impressive. Gert

11th October 2006, 11:22 PM	#8
bfard diyAudio Member Join Date: Sep 2006	All, Thanks a bunch for the information. fgroen, Outstanding job! Wow! Bobby

12th October 2006, 08:22 AM	#9
fgroen diyAudio Member Join Date: Nov 2005	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) As for the grilles on that French website: One of the pics shows a machined block of aluminium with little holes. 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. He CAN remove them... 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.

12th October 2006, 08:51 AM	#10
AuroraB diyAudio Member Join Date: May 2001 Location: Norway, -north of the moral circle..	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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