my new diy speakers project

[korabetsni]

hello,
I had made many loudspeakers before. this is my new project. 3 way loudspeakers with seas excel drivers.(w26fx001,w15ch001,t29cf002) They are not completed yet. I have almost made the enclosures. they are made from polyester fiber, plywood and MDF. The crossover will be inside the granite base (not on the photos). I have spent about 6 months on it by now. I will update this post when i 'll have completed the speakers.What do you think?

 

[badman]

Is this really new? Because I've seen another "nautilus clone" that looked nearly identical, also using Seas Excel.

But whatever, that's a heck of a lot of work for the cabs, hope they sound as cool as they look. Be sure to cover the tweeter faceplate in thick felt as it looks like you're using a worst-case diffraction scenario for the tweeter (the other drivers should be okay, especially the woofer)

 

[korabetsni]

hi,
yes there are also other people that maked this project. What do you mean worse case scenario for the tweeter?

 

[korabetsni]

hi
can you be more specific about the thick felt please. What do you suggest to do?

 

[hooligan72]

That's beautiful work. I would love to see some build pictures.

 

[badman]

Note how in the B&W Nautilus, the drivers are large relative to their mounting surfaces, as it is with your woofer, where there's a minimum of "Baffle". A circular baffle has the same distance from the diaphragm to the edge at every point on the circumference, so you get one very heavy diffraction mode. There's quite a bit of documentation on the effects of surface mounting vs. flush-mounting dome tweeters, you can consider this as a worse version of surface mounting. By using felt, you absorb the energy that illuminates this edge, so there's a largely reduced amount of energy to excite the diffraction modes. This also helps reduce off-axis energy somewhat in the crossover range to the mid, which is a good thing in this and most cases.

 

[korabetsni]

here are some build pictures. Many thanks Badman for the explanations.

 

[badman]

wow, very slick, the build is even more impressive than the result

 

[tuxedocivic]

Unreal!

 

[korabetsni]

do you think that i must use damping material? in the midrange cabin maybe? Other 2 people that i know (who made these speakers) did not use any damping material. What is yours opinion?

 

[Paul W]

I can only wish to work that skillfully! A great crossover and you will have a true work of art.

 

[korabetsni]

hi,
today i finished the crossovers. I have also painted the enclosures. i am posting some photos. Later i will upload better photos of the completed speakers.

 

[zakman35]

Amazing, work. Bravo!!!

 

[DrDyna]

Those are very nice looking! Great work.

Unfortunately, I'd never be able to make anything of the sort, my SO hates the look of nautilus shells "they creep me out!"

Excellent work though.

 

[korabetsni]

the shells does not look so creepy. I uploaded some photos with the drivers in. I am so curious about the sound. tomorow i will complete those speakers and will have a good listen.

 

[badman]

And try a felt ring on the tweeter baffle

 

[Cal Weldon]

Very nice. You must be very proud.

 

[korabetsni]

finally finished

After a 6 months of work (every weekend and almost every evening) i finally completed the speakers. I must say that i will not do something like this again. The sound of those units is wonderfull. The bass don't go very low but is very good and stiff for this size closed type shells. The mid-high are very detailed. There is a big difference compared with my previous speakers whitch have bigger volume and dual bass Audax 8'' drivers and Morel tweeters. (there is also a big difference in the price of those units). I have completed the AV400 power amplifier to drive those speakers (http://www.diyaudio.com/forums/solid-state/191130-finished-av400-help-problem.html). It seems that they need powerfull amplifier as they are only about 86db/w.
I am very happy with the result. Optically the shells are a little strange but i can live with that.

 

[Kjeldsen]

diffraktion

I have tried to simulate diffraktion for tweeter. First graph (red) shows 25 mm tweeter on a 150 mm circular bafle. The second picture shows a 25 mm tweeter on a 30 mm bafle.

 

[korabetsni]

hello,
yes i know the difraction problem. the tweeter baffle is 12cm diameter and the tweeter is 29mm. I am trying to find felt for the tweeter but i cannot so i will make by myself .
Can you make a simulation with this data?