The Kjeldsen OB build thread

[Kjeldsen]

Time to go away from prototyping. I have bought som solid oak to make the "final" speakers. The front baffles will have a 7 inch full range and a small amt tweeter. Behind the baffle I will place a u baffle "barrel" with a 15 inch woofer. The barrel will be stuffed for a cardioid like pattern

Some progress already.










Still missing some grinding and rounding. Still a long way to go

 

[Kjeldsen]

The woofer. Gladen RS15FA


The full range. Cube Audio F180



And the tweeter.

 

[Kjeldsen]

Some sanding and routing progress

 

[ewollowe]

Looking forward to seeing this completed

 

[Kjeldsen]

Thanks. I hope you have some patience ��

 

[Kjeldsen]

First layer of oil

 

[diyiggy]

Pretty good finish.


May have you the spl graph or Xmax of the woofer from a review (not in the datasheet!) for sim. ?


There should be plenty of pro car drivers for hifi needs in the bass dpt... that's a good thing to see more such things

 

[Pano]

Beautiful woodwork! Will the 15" woofer fire between the legs of the baffle?

 

[Kjeldsen]

Yes. Between the legs, and mounted in a tube.

 

[Kjeldsen]

Pretty good finish.


May have you the spl graph or Xmax of the woofer from a review (not in the datasheet!) for sim. ?


There should be plenty of pro car drivers for hifi needs in the bass dpt... that's a good thing to see more such things

I have the xmax from the manufacturer somewhere. It's more than enough I remember. Most car audio woofers are not good for domestic use. Free air woofers can be good. This woofer is also used in a commercial OB speaker.

Thanks for the fine words

 

[jamesblonde]

I have the xmax from the manufacturer somewhere. It's more than enough I remember.

According to Subwoofer Gladen RS 15 Free Air - Ahifi.cz the Xmax is +/- 15mm.

 

[Kjeldsen]

Yes that is also the answer I have from Gladen it's the linear xmax and not xmech.

 

[Kjeldsen]

Yes. Between the legs, and mounted in a tube.

The model

 

[Majorna]

FINALLY!!!!

I have been waiting for you to continue you OB journey. Looking forward to pics and hopefully graphs.

Keep up the good work!

/Majorna

 

[Kjeldsen]

I reuse the mdf from old prototypes, and do not have spare speakers. So I have been creative

 

[Kjeldsen]

Some progress

 

[Kjeldsen]

In the meantime

 

[scottjoplin]

Hello again. Did you post on the prototype? The Cube is effectively naked, best response but most challenging for the driver and EQ?

 

[Kjeldsen]

I don't have much from the latest prototype. The Cube only needs eq below approx 300/350 hz. In the range above 6-7 khz I supplement with a tweeter otherwise I think beaming is too much of a disadvantage. Woofer needs some kind of baffle, if naked multiple woofers are needed.

 

[scottjoplin]

Have you seen Charlie Laub's thread on naked dipole? He decided there was no real advantage to naked woofers.