Looking For Folded Horn Sub Plans

[nniwelt]

I have looked for a long time to get this photo, cause I was wondering how this box is made. Eventually this image came from EAW promo materials.

*** Image removed at members request - Vikash

[qi]

Originally posted by GM
Greets!

You can't scale horns this way, any more than you can a sealed or vented cab, unless of course you want Fl, Fh to be much higher.

GM

Thanks for the clarification, Greg.

Use a scale factor of .625, not .5 to get the original Jensen Imperial dimensions. The original design uses a 15" driver, not a 12".

I have looked for a long time to get this photo, cause I was wondering how this box is made. Eventually this image came from EAW promo materials.

I see no image...

[GM]

Greets!

One more time..... you can't scale a cab this way and expect similar performance! Anyway, Steve's design is enough different from the original that he shouldn't be referring to it as an 'Imperial' IMO: http://www.highefficiencyloudspeaker...l_Build-in.jpg

GM

[qi]

GM

Yes and no...

I am just using simple math to scale a "super-sized" design back to its original state.

The plans you posted are the originals, and known to be flawed and very difficult to work with.

Actually the website you reference confirms this.

Steve's plans are easier and more "buildable" IMO

[nniwelt]

qi
You see image now?

[qi]

Norbert

Yes, thank you.

At a quick glance, it looks "doable". The expansion rate almost looks linear -- (consisting of expanding straight sides).

The two curved folds could be made of thin veneer, back-filled with "great stuff" (pvc foam) for rigidity and damping (essentially what they describe)

The initial flare is at a perpendicular plane to the main flare, but also appears to be linear (expanding straight sides)

It looks like a single driver may be an option, also.

But the thing is a monster (approx 5' x 3' x 3') -- not easily portable (unless you look like THE ROCK)

[mike.e]

Originally posted by qi
Norbert

Yes, thank you.

At a quick glance, it looks "doable". The expansion rate almost looks linear -- (consisting of expanding straight sides).

The two curved folds could be made of thin veneer, back-filled with "great stuff" (pvc foam) for rigidity and damping (essentially what they describe)

The initial flare is at a perpendicular plane to the main flare, but also appears to be linear (expanding straight sides)

It looks like a single driver may be an option, also.

But the thing is a monster (approx 5' x 3' x 3') -- not easily portable (unless you look like THE ROCK)

The eaw cabinet is simple.The fancy foam may help resonance of panels. The curvings wont help it in its passband.

The series of parabolic/conical expansions approximate an exponential or hyperbolic flare. Probably 4-8units required for stated sensitivity and cutoff.

Marketing ploys use a cover of mystical magic to make a unit appear advantagous to buy. Its probably similar to the labhorn. Easier to make too!!