[Yad]

This is my modification of the famous Troels Gravesen's EKTA GRANDE speakers. Made on Scan Speak revelator drivers. Our models looks alike to each other, but inside they are rather different.

 

[johnnyfamous]

Re: Latest build pictures

Yad, those are very nice!! The use of exotic wood veneers sure can make all the difference. What veneer have you used?

I have not found many pictures on diy builds using EXOTIC veneers, i would love to see what else people have out there????? Its good inspiration!

Ebay has been a great scource for some very unusual veneer.

 

[Yad]

Re: Latest build pictures

Thank you))) I used vacuum veneering tool. Material - is some african tree veneer [Bubinga pommele] + royal(piano) lacquer (approx 5 layers with polishing)

These speakers are heavy) about 50 KG each.

 

[StereoClarity]

Re: Latest build pictures

Yad, would you mind doing a veneering tutorial for the rest of us dummies? :bigsmile:

I'd love to learn how to do veneer like you guys. I usually have to use birch to get such a nice finish. Even then, it's never quite like that!

 

[Yad]

Re: Latest build pictures

Hi,StereoClarity )) I would like to, but I'm afraid , that my poor english will not be interesting for most of you. ))
Sure, it will be perfect to make such tutorial. So, let's try together !

 

[Yad]

Re: Latest build pictures

One of my book-shelve speakers Rebell-1. Kevlar cone 6" midwoofer & 1" soft dome tweeter. Closed Enclosure. 3-rd order crossover network with time-shift (time alignment) correction.

 

[StereoClarity]

Just beautiful Yad. Very nice work.

 

[Mike P.]

What are the model numbers of the Scan Speak drivers and the frequency response of the tower speakers? What did you use for the crossover?

 

[Yad]

Original Ekta Grande of Troels Gravesen is here. http://www.troelsgravesen.dk/ektagrande.htm

Original construction - is perfect stuff for DIY!!! There are all specifications at this link.


My modifications:

1) i used 2 quasi-separated volumes for LF.
2) Another volume for MF: i used aperiodic (like)IB enclosure (while original was CB)
3) Position of all drivers are closer to the center line of speaker. The box is little wider.
4) Little-bit changed filters

 

[Yad]

The idea of aperiodic MF enclosure is shown at this picture. Red line - shows this volume for midrange.
The same idea Is used by Bowers & Wilkins Nautilus 801 088 and 802 speakers.

 

[Yad]

b&W's midrange enclosure

 

[Chester]

Yad: those are some great looking speakers, the veneers are really classy Regarding the aperiodic enclosures, have you made one (you brought that up sort of 'out of the blue'...)? In my N7R speakers I was going for that general shape however in steel (at reasonable cost) the well pressure tanks were the best match I could find

 

[Yad]

Thank you, Matt.
If i understand your question correctly, the decision to make aperiodic enclosure was not "out of the blue"

 

[Yad]

The idea was to create the box without inside's rectangular shape and without parallel walls inside. But i did have rectangular outside shape. So, the result - is to put curved surface into the rectangular box. It kills the most number of standing aves inside) The result is audible. In aperiodic enclosure gives less coloration. But sounds more fresh and detail, then the box extremely damped with the fiberglass.

 

[Chester]

Oh; yes, I meant you brought up the topic of aperiodic enclosures "out of the blue" (I couldn't see where someone asked you about them, I didn't realize you were putting them inside of a box). Do you have any internal pictures of your speakers? I would be interested to see how you made the aperiodic shape in the box.

 

[Endesereth]

wow those are very nice! how much money did it take to make them?

 

[Yad]

the idea was the same as at the post #10. Later i'll show here the "print screen" from my CAD

 

[Yad]

wow those are very nice! how much money did it take to make them?

Without speakers and circuits the pair of those custom made boxes were approx. 1500-1600 euros.

 

[Yad]

well. There are lot's of methods how to do an aperiodic boxes.
Here are some pictures. One of my friends made the second construction. He is still happy ))

the first one - is the possible rear panel of speaker

 

[Yad]

as for me, i made the thing, like was the thing shown by european "DIY-guru" Edd Collier.
http://picasaweb.google.com/collier6/Concave?feat=directlink#

In my case I used another shapes, but an idea was the same.