DIY-project: JBL Kebnekaise S4365

[bubbleboy76]

This will be my first DIY-project. It will be kind of "open source", so I hope all you guys can ship in with ideas, thoughts and help

Components at hand:
476mg compression driver
H4365 horn
1501fe woofer
4365 speaker grills
dbx4820 dsp
Crown CTS-1200 amps

I have a rough plan what to do

What would you have done?

"Kebnekaise" is the highest mountain in Sweden. Not especially high though

[srm51555]

Not sure what I would do different. Maybe raise the woofer height to ~45cm. Dual 1501fe's or adding a 2216nd as a helper woofer might be interesting since we are naming it after mountains. I look forward to seeing what you come up with.

[JeffW]

With the shorter vertical dimension of the 4365 horn compared to the M2, it should be possible to get the woofer a good height from the floor without making the cabinets too tall.

I look forward to your Kebnekaise design.

[Earl K]

Nice Project!

One suggestion I'll make ( even when bi-amping ) is to include a 10 to 15db pad with a bit of HF compensation ( a capacitor wired as a by-pass over the pad ).

Doing so will help re-align the 2 ( different ) sensitivities ( dynamic capabilities ) by offering a more cohesive ( combined ) wave-front .

One can check for this dynamic cohesiveness ( or lack of ) if one is used to things like the sound of live orchestrated woodwinds ( specifically those instruments using reeds ).
- When their harmonics ( mostly coming from the horn driver ) get out of whack ( & overly dynamic ) one's ears will rebel ( assuming one is familiar with what an oboe sounds like.

[bubbleboy76]

The first concept draft, inspired by many things from this site.

The 1500FE or 1500AL and their variants also make excellent choices for those requiring extended bandwidth for an outstanding two-channel solution. G.T. has stated numerous times that if he had it all to do over again, his "1200 Arrays" would have been "1500 Arrays" with the 1500AL's operating from 25 Hz on up to the Array horns.

Modular design to be able to use the horn both vertical and horizontal. But most important, to be able to get the damn thing up my stairs!

Rounded backside inspired by K2 S9900.

Woofer is raised to be as close as the horn as possible. Another version I have has even more raised woofer, with 850mm high woofer-box, so that the centre of the woofer is at 60cm from the floor. But then the original 4365 speaker grill will not cover the whole front. I can solve the height with higher feets as well.

Do you like it?

[bubbleboy76]

From above.

[ivica]

The first concept draft, inspired by many things from this site.

Rounded backside inspired by K2 S9900.

Woofer is raised to be as close as the horn as possible. Another version I have has even more raised woofer, with 850mm high woofer-box, so that the centre of the woofer is at 60cm from the floor. But then the original 4365 speaker grill will not cover the whole front. I can solve the height with higher feets as well.

Do you like it?

Hi bubbleboy,

I can not see any benefits from the "rounded backside", only box volume reduction.

Regards
Ivica

[bubbleboy76]

Nice Project!

One suggestion I'll make ( even when bi-amping ) is to include a 10 to 15db pad with a bit of HF compensation ( a capacitor wired as a by-pass over the pad ).

Doing so will help re-align the 2 ( different ) sensitivities ( dynamic capabilities ) by offering a more cohesive ( combined ) wave-front .

One can check for this dynamic cohesiveness ( or lack of ) if one is used to things like the sound of live orchestrated woodwinds ( specifically those instruments using reeds ).
- When their harmonics ( mostly coming from the horn driver ) get out of whack ( & overly dynamic ) one's ears will rebel ( assuming one is familiar with what an oboe sounds like.

Interesting. Thanks. I will consider this.
It would be better to enhance the dynamics of the LF, than reducing it on HF, I guess. Just send me some more 1501fe's please!
The dsp-settings will have to reduce HF much more than LF, to the point of them having almost the same kind of sensitivity, I think.

I will have protection-caps on the compression-drivers, off course.

[bubbleboy76]

With the shorter vertical dimension of the 4365 horn compared to the M2, it should be possible to get the woofer a good height from the floor without making the cabinets too tall.

I look forward to your Kebnekaise design.

[Ruediger]

... will reduce early reflections. That are the ones which have travelled from speaker to left or right wall and then back to your ears. Their amplitude response is that of a comb filter.

Ruediger

[bubbleboy76]

... will reduce early reflections. That are the ones which have travelled from speaker to left or right wall and then back to your ears. Their amplitude response is that of a comb filter.

Ruediger

So you promote corner-placement?

[bubbleboy76]

Not sure what I would do different. Maybe raise the woofer height to ~45cm. Dual 1501fe's or adding a 2216nd as a helper woofer might be interesting since we are naming it after mountains. I look forward to seeing what you come up with.

Raising the woofer, check!

Dual 1501fe's, I would love to! Just send me another pair of 1501fe's, and I will do it!

[hlaari]

your project are in good progress

[bubbleboy76]

your project are in good progress

Do you have more of those 1501fe's?

[bubbleboy76]

I have owned real JBL 4365s previously. Some might remember this thread:
http://www.audioheritage.org/vbullet...ht=4365+active

2-way active ended up super super nice.

I am very interested to see how an vertical horn will sound in this application, Array-style.