Klason & Strange, folded basshorn, acient design ?

[AKN]

Originally posted by Ivo

In the meantime, here's a 3D drawing I did of the newer 10"version. [/B]

Nice, I'm looking forward to se the RT2 12" version as well.

[mhtplsh]

Looks interesting!
More models with different speaker size welcome!
Full construction details will be more better.

[AKN]

Originally posted by mhtplsh
Looks interesting!
More models with different speaker size welcome!
Full construction details will be more better.

Hi mhtplsh,

If you mail me I can send the article containing two 12" variants. Written in Swedish but complete plans including measurements on the larger RT2 (done outdoors in mouth).

[Ivo]

Hey all,

Interesting designs, aren't they? And what a .... challenge, reading in Swedish. But, with my related language and an online dictionary, I just manage.

3D models are being made. R2 is finished, R3 is still a plain box with nothing in it.

I am amazed by the R3. The elegant folding, with tilted panels, it's all very unusual. It so small, I can actually find a place where it fits.

Can this be placed next to a corner with one end? I would asymmetric boundary loading.

Rgdrz
Ivo

[AKN]

Hi Ivo,

I almost missed your post.
These horns and in particular the RT3 was very popular as diy project in Sweden at the time. And as you say the folding RT3 is very elegant. The larger RT2 with longer path and greater volume has more low end of course.

As for placement I think the smaller RT-3 should work fine placed next to a corner. The larger has split path/mouth at the very end formed by floor, back wall and box (triangle) so you will severely decrease mouth area if placed next to corner.

I’m eagerly awaiting your 3D models

[Ivo]

Hi Anders,

The reason I asked about corner placement, is that it reminds me of the Monolith horn by Bruce Edgar. You can find the article with detailed plans and descriptions about this basshorn at the download section of Volvotreter's website. Edgar said you could place it along a wall or in a corner. When placed in a corner, you should increase height to keep the mouthsize the same.

Now that I think about it more, the RT2 and RT3 are really quite similar to Edgar's Monolith, and also to Edgar's current Seismic horn subwoofer. They are just much smaller. This may mostly mean that they are tuned to a different environment, i.e. concrete and brick European homes with different roomgain compared to US homes. There are reports from Americans with Klipschorns that barely manage 45 Hz in their living room, while a Dutch audio friend had 25 Hz at -3 dB with the same horn...

I have found this advertisement of the frontloaded 10"version, with two pictures. This person has the horn placed on its side, in a corner. At least in one picture. It seems I was not the only one with this idea. http://www.hifi-forum.de/viewthread-171-718.html

Considering my current living situation, the RT3 seems the better choice. Fortunately, I may be moving to a bigger house soon.

[Ivo]

Here is a 3D image of the RT2. I have left out the bracing for clarity and have not yet put in the corner reflectors. The version partly visible in the background, is a closed and wood-coloured version, with a flatscreen TV on it.

Note that you are looking at the back side of the horn. The interior was more clearly visible from this angle.

[Empee]

wooo

lookin' good man !
I'm still VERY curious for the sound if you build one

but will you be going for the 10" or the 12" version ?

keep us posted !


Cheers,

Empee


ps.
are you going to the Robodock festival ?

[planet10]

Ivo,

ave you uploaded those plans to the warehouse?

dave

[Ivo]

Originally posted by planet10
Ivo,

ave you uploaded those plans to the warehouse?

dave

No. I might. However, due to some idiosyncracies of Sketchup, parts of these drawings are not accurate and the perfectionist in me doesn't like putting stuff out there that is not accurate. The RT2 and the earlier Klason are pretty accurate, though. There's some errors in the 12" cornerschmacks. I have better Sketchup skills now, I might be able to correct them now. The RT3 drawing looks nice, but is a dimensional mess at the moment...