Multi-Sided Conical Mid-bass Horn

[green heron]

Hi Ben,
Checked out your blog, very nice work.. Like the conical you are currently working on.

Thanks Kevin. I spent some time working my conical midbass / upperbass horns yesterday, and they're really shaping up. I thought of a nice high-strength way to mount the driver cabinet to the cone. I attached "wings" near the throat that will attach to the driver cabinet. Now that's looking more like a rocket ship than a horn!



I'll post my build process (and calculations) in the next few weeks if anyone wants to try building multi-sided conical horns. I could see smaller (350Hz) compression driver conicals being way easier to build than the midbass horns. The larger ones are tough to assemble properly.

http://diyfirefly.blogspot.com

[kevinkr]

That looks really great. I look forward to reading your impressions of the end result. Real craftsmanship in action.

I'm messing around with Horn Resp and a couple of things are elluding me at the moment including how to know whether the size of your conical horn is correct for the LF cut off you are trying to achieve. Have I missed something obvious, or is there some other software that makes this a bit clearer?

Incidentally the current horn resp program runs just fine under Wine in Ubuntu Linux.

The ressemblance to a rocket engine is uncanny..

[dkalsi]

I'll post my build process (and calculations) in the next few weeks if anyone wants to try building multi-sided conical horns. I could see smaller (350Hz) compression driver conicals being way easier to build than the midbass horns. The larger ones are tough to assemble properly.

http://diyfirefly.blogspot.com

I too am looking forward to your build and impressions. Got your blog bookmaked

Please do continue posting.

[green heron]

I too am looking forward to your build and impressions. Got your blog bookmaked

Please do continue posting.

After several months since I posted last, I finally finished the pair of midbass horns. I haven't listed to the pair yet, but I did test out the first one as in "mono" and I was very impressed with the range. It seemed very flat considering my basement isn't the ideal environment for audio. Listening by ear, it easily covered 100 - 600 Hz without any major dips. I posted some updates on a new website including a picture of these monsters.
http://sites.google.com/site/diyfire...-midbass-horns

[green heron]

I'm looking at doing something similar for a pair of JBL 2440 w/2445J diaphragms I recently received as a gift. Or possibly a conical.. Cosmos I hear you have a number of good designs - anywhere I might get a look at them? I'm searching..

Kevin -

You could probably design a 320 Hz midrange horn with hornresp and use the same process to build a horn that I used for my 100 Hz midbass multi-sided conicals. One difference is that it would be light enough to glue up with blue tape instead of having to use dominos or biscuits to join the sections. The other difference is that instead of building a compression chamber "box" for the driver, you could just attach a wooden "plate" that would connect to the compression driver. It would be much easier than turning on the lathe, and you could probably finish a pair in 10-15 hours with the right tools.

[eso]

Nice.

Those are kind of like these except for a regular driver:



These are a midrange version in Brazilian Rosewood:



Pair them up with 2 of these and you're getting serious:



That's a 21" woofer in a 9.5 cu/ft sealed enclosure... you don't really get the scale in the photo.

Conic horns can do quite well.

eso

[1audiohack]

Hmmm, those look very familiar, and yup they do sound great!