The Kjeldsen OB build thread

[Kjeldsen]

Yes, I think I have seen most on dipole and open baffle. I have tried flat small baffle, flat wide baffle, u baffle, slot loaded and ripole (all with the same Gladen woofer). Flat wide baffle I like most because you can go quite high in frequency, but it's too big. I don't hear much difference between u baffle and ripole or slot loaded

 

[scottjoplin]

That's interesting thanks, I have U-frame woofers. Have you decided to go cardioid like for placement reasons?

 

[Kjeldsen]

Yes, I will stuff the u frame for less output from back and more wide output from front.

 

[Kjeldsen]

Thought it was easy to work with this flixibel wood. But it have a life of its own. Had to invent some temporary sticks to hold back the pressure and keep the more or less circular form

 

[Kjeldsen]

I have to do some measurements before I decide on the depth of the barrels

 

[Kjeldsen]

Might need another circular piece of Mdf at the back.

 

[scottjoplin]

Did you cut the grooves in the MDF yourself? On a side note, I'm intrigued by the upsidedown radiator....

 

[Kjeldsen]

No, I have bought it this way. You could do it yourself, but it would take forever.

The radiator is standard in DK. You can see it other ways though

 

[Kjeldsen]

It's alive. I have just made a quick test used as subwoofer below 50 hz. It's promising even with just one. No measurements yet, but be patient. They will come.

 

[Kjeldsen]

First raw no filter - at very deep tone the cabinet shakes, so need to be heavier
Second a 12 dB boost cut around 50 Hz linkwitz riley 24 dB and added another filter for even steeper cut
Measurement distance = 1 meter

 

[Kjeldsen]

eq and crossover settings

 

[pelanj]

That looks like t.racks DSP mini 4x4. What do you think about it?

 

[Kjeldsen]

It's great but have one big flaw - delay is only for live delay speakers. Shortest possible delay is about 25 cm

 

[pelanj]

What is the lowest step (in ms) you are able to achieve? I can adjust mine in 0.023 ms steps - which is around 8 mm if I am correct. The trick is to use keyboard arrows up/down or left/right instead of a mouse.

Mine do not remember the settings if I load them from a saved preset after power off. It remembers only the settings in the default preset - maybe you know a trick for that?

 

[djn]

You might want to fill the slots with some hard glue to firm up the barrels. The speakers look good.

 

[Kjeldsen]

Pelanj. Thanks, that saved me a few buck. I did talk to thomann and they said no short delay is possible. I did try to type in figures also, but that was not possible, but the trick with arrow up/down works like a charm

 

[Kjeldsen]

You might want to fill the slots with some hard glue to firm up the barrels. The speakers look good.

You are right and I do plan to glue some resonance shhet inside, but I don't think it is enough. It's not a big deal to cut out two rings of mdf

 

[Kjeldsen]

Well, still working on these. The bendable boards are really bad quality, so need to do some mods to be able to make the finish.

 

[Kjeldsen]

Some progress

 

[Kjeldsen]

Black or White? Definatly Black