Is it possible to cover the whole spectrum, high SPL, low distortion with a 2-way?

[Ro808]

We might be better off splitting this vintage gear into its own thread. We seem to be getting pretty far OT.

Understood

 

[Ro808]

docali, I suppose it's next to impossible to integrate such an elliptical constriction (similar to the 18 Sound horns), or super elliptical (as per RCF) into your program?

 

[docali]

To what profile do you exactly refer? Many things are possible but not all are interesting for me Why copy a thing that already exists?

 

[Ro808]

Perhaps not for you, but it It could be interesting for the DIY community

 

[docali]

If you provide me the profiles or the functions then we can see what is possible. Only having pictures in not a good option. Also, these shown special throat regions seem to be impossible to recreate without the exact profiles. But is so interesting with these 18s horns?

 

[DonVK]

This is the stretched jericho from Is it possible to cover the whole spectrum, high spl, low distortion with a 2-way?

I've extended the horn a little and added a round over. The green color is the original horn, teal color flares to 90deg, and the grey color continues the round over like before. In trying to reduce the model size, part of the round (grey) over got a little hex shaped and is causing some off axis roughness. The RadImp could also be improved with a larger mouth flare (more teal color).

 

[DonVK]

and now the fields...

 

[docali]

Impressive work, as usual!

I wonder what a horn with a golden ratio expansion would look like.
Possibly similar to Joseph Crowe's Exponential Spiral horns.

There are probably only a few people on this planet who are able to generate such horns in a strictly mathematical manner.
I can think of only 3 (including you) and it wouldn't surprise me if yours turn out to be mathematically the most elegant/puristic.

Here is a golden ratio throat radial like horn with completely smooth profiles what I personally prefer. This would need an appropriate adapter in order to form the wave front to rectangular - generally not really a challenge:



This should work good in a 2-way speaker system.
View attachment drba_radial_grt_1.zip

 

[docali]

Great job Don!

It proves that the round-over is an improvement. This horn has considerable different beaming properties H/V wise. I would prefer this over the round horn. Maybe an elliptical shape or super elliptical would show even better results.

 

[camplo]

This horn also beams less than the round Jericho, though the polar is not as smooth and both load low. The HvDiff is kind of the one I've been rooting for. Even if its size needs to be scaled. I agree, the round-over is working, I think it works better with some shapes than others though.

 

[DonVK]

@docali - thanks. I would also prefer an elliptic, and I think the polars would be smoother with a more rounded transition between V-H.

@camplo - keep in mind some of the polar roughness is from a non ideal round over (it ended up a hex, after meshing to reduce model size). There is also the issue of determining the radius of the round over. It's still a visual add on for now. In the previous round Jericho I tried a few different radius round overs before "2b" was presented. The stretch presented some CAD problems with sweeping the roundover along the mouth perimeter and then trying to form the mouth-free space boundary.

 

[gedlee]

Why copy a thing that already exists?

Maybe because it is the best way to do it!?

 

[camplo]

@docali - thanks. I would also prefer an elliptic, and I think the polars would be smoother with a more rounded transition between V-H.

@camplo - keep in mind some of the polar roughness is from a non ideal round over (it ended up a hex, after meshing to reduce model size). There is also the issue of determining the radius of the round over. It's still a visual add on for now. In the previous round Jericho I tried a few different radius round overs before "2b" was presented. The stretch presented some CAD problems with sweeping the roundover along the mouth perimeter and then trying to form the mouth-free space boundary.

 

[DonVK]

The "drba_jmlc_150_hvdiff-3dview" is up next

 

[camplo]

 

[plasnu]

Ro808, amazing information about RCA stuffs. I didn't know any of them.

 

[plasnu]

We might be better off splitting this vintage gear into its own thread. We seem to be getting pretty far OT.

I agree, but it is also true that the talented people always find something new from obsolete technology.

 

[daemonsgr]

Here is a golden ratio throat radial like horn with completely smooth profiles what I personally prefer. This would need an appropriate adapter in order to form the wave front to rectangular - generally not really a challenge:

View attachment 802287

This should work good in a 2-way speaker system.
View attachment 802288

This looks nice!

 

[Pano]

I agree, but it is also true that the talented people always find something new from obsolete technology.

For sure, but the "vintage best practices and their descendants" is worthy of its own thread.

 

[tnargs]

...Why copy a thing that already exists?

Maybe because it is the best way to do it!?

For attempting to impose reality on this thread, Earl, you are awarded spoilsport!