Sonus Faber Extrema

[cfbuck]

Thanks for the reply post Marcel. I did not want to hijack this thread so I asked for a private email. My email is:

kandfbuck ;;at.. execulink.com

 

[bfard]

Almost there!

Thanks everyone for your help. My project was on hold for over a year because my project partner had an accident. We started back with the development and here are some pics.

 

[bfard]

Here is the back of the speaker!

 

[bfard]

Learned how to apply leather!!!!

Front leather panel! This was a tough one!

 

[bfard]

Front panel!

 

[bfard]

Crossovers and driver burn-in process! I use a frequency sweep from 5Hz up to 100KHz sweep using sine wave and then square wave. Then I play different type of music for long hours. I used Bees Wax to cover the crossover components (only two inductors) the resistor is mounted at the back of the speaker on a radiator.

 

[DAMIC]

Hi,

Nice and interesting project. From Stereoplay article about Sonus Faber Extrema, it is not enough clear to me, whether there is added mass on the B-139 diaphragm??

Secondly, anyone have idea what approx. should be the value of the resistors attached to B-139 coil terminals? It seems that there are 5 different values, each of which give apropriate LF response centered about 50Hz.

regards,

 

[Salas]

Here is the back of the speaker!

Excellent work! Expecting your first impressions and data.

 

[bfard]

Thanks Sala! It's been a challenging project. I will post more pics soon. For the resistors, I am using 5 values, starting from 0Ohm (total shunt) up to four times the value of the Impedance of the driver. 0, 2, 4, 8, 16, 32 Ohm. I just guessed the values!! Can someone help me with the black paint? What type of Primer and Paint is best for this project? The manual says it uses a Black-satin lacquer paint.

 

[DAMIC]

Bfard, thank's for info concerning resistors.

regards,

 

[bfard]

Almost there!

The Body!

 

[bfard]

Almost there!

Side Panels

 

[bfard]

Almost there!

Body!

 

[bfard]

Hardware!

Binding posts and .....................

 

[Per]

Hi.

Very nice work; all mascined with cnc?

Per

 

[bfard]

I wish! No, actually I used a regular drill, file, sandpaper by hand.
Thanks,

 

[badman]

Terrific work

Not much of a 'clone' guy myself, but you're doing a great job, I hope the sonics meet your effort outlay.

 

[bfard]

Thanks, I'm hoping it would sound good as well.

 

[soundengine355]

bfard:

What drivers did you use for the watt clone?

Do you have a crossover diagram?

 

[papaB]

Hello !

very nice job !
how did you realise the side panel roundness ?

thank you 😉