Ever think of building a Cornu Spiral horn? Now you can!

[DaleHughes]

Would I be completely crazy to try and build something based on this design, only have them so that they lie flat, say on a desk, and have the driver raised out and aimed 90 degrees down, so as to aim horizontally? Possibly with a horn too? Would the extra length between the driver and where the driver would normally be in these designs, along something like a plumbing pipe, effect the tuning?

 

[Cal Weldon]

It may but I'm not sure that would be a bad thing. Maybe X will see this.

 

[fatmarley]

Would it be possible to do a 2-way or even 3-way with this design?

 

[Cal Weldon]

You would have to alter the driver chamber as these Cornu's are rather tight.

 

[fatmarley]

I wonder if THIS driver would work?

Or how about THIS?

 

[Cal Weldon]

They start to get rather large. I am thinking 42-48" which, when you build it, is pretty close to massive. The 36" ones I have seem really large.

 

[fatmarley]

Yes, perhaps that's a bit too big.

I wonder if the little Visaton FRS 5 X would work?

 

[Cal Weldon]

A 2" driver really limits the low end. 4" to 5.25" seem popular.

 

[Moset]

Didn't someone already do a two-way in this thread? Embedded a tweeter in the baffle just above the main driver. Can't seem to find it right now, though.

 

[Cal Weldon]

I did the Penthorn. It's not a Cornu. Is that the one you mean? Easy to fit the tweeter with the channel shape.

 

[lutkeveld]

I wouldn't even glue on the front face, it looks like art on the inside

 

[Cal Weldon]

Cheers.

If only they sounded better. The channel length is not long enough unfortunately. Big hump around 200 Hz or even higher.

 

[xrk971]

Another option is a small coaxial auto sound speaker. There are also pro audio 5 inch drivers that have a coaxial horn and CD. They don't have much bass though.

 

[Cal Weldon]

I've not had luck the car coax's. Maybe they're just lousy sounding to begin with, not sure, but they are a good idea.

 

[Moset]

I seem to recall it was a pretty shallow tweeter mounted on an MDF or ply baffle, that protruded just slightly into one of the channels of the cornu. I'll look through the thread and see if I can find it.

 

[Moset]

Actually, it was a foamcore baffle. Post 1373:
http://www.diyaudio.com/forums/full...u-spiral-horn-now-you-can-35.html#post3848263

 

[iko]

They look very nice Cal!

 

[Cal Weldon]

I am taking the 36"ers to planet10's annual fest. I am looking forward to hearing (and seeing) peoples reaction to them.

Back in a couple days, gotta ferry to catch.

Cheers.

 

[xrk971]

That sounds like a lot of fun Cal. Tell DUG from Toronto I said hi, he said he is going - he will be showcasing his custom TPA3116D2 class D amps which sound fantastic and are the ideal complement to most fullrange drivers.

 

[Cal Weldon]

Yup DUG came by Saturday afternoon and then again the next morning.