Only a few. And a lot of disinformation. One of those videos where you need to know more than he does whem he strays beyond his understanding of what he is doing.
Take everything he saysnwith bag ofn salt, checkntwice.
dave
OMG! 🤭
That is definitely my stereotype vision of 60s and 70s interior! Our house will not be that extreme, but it does match a certain sense of direction. 😁
It gives me Jamiroquai vibes. 🤣
I poured the bottom reflector yesterday, with modelling plaster. I followed instructions, I think (.........), but it was too thin and wouldn't harden. I tried to make it better and of course made it worse. Now it's a lumpy mess. Probably going to take it out and pour again. Sigh.
Don't be to frustrated, plaster is a pain in the butt.
I have done thousands of molds for large sculptures and eventually you get the hang of it.
Mixed right, it will dry very very fast and get a little hot in large batches.
And you are moving fast.
Even after a few hundred molds, you can still have bad days.
Cant really add more water, once it starts setting. It will never dry.
One mix to a ratio and that is it, and go go go go.
You can mix a little watery from the start, but once it starts setting , dont add more to try and keep working with it.
I have done thousands of molds for large sculptures and eventually you get the hang of it.
Mixed right, it will dry very very fast and get a little hot in large batches.
And you are moving fast.
Even after a few hundred molds, you can still have bad days.
Cant really add more water, once it starts setting. It will never dry.
One mix to a ratio and that is it, and go go go go.
You can mix a little watery from the start, but once it starts setting , dont add more to try and keep working with it.
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To my relief, most of the reflector is pretty smooth. The bumpy parts stick out, and stick to the corner. I am slowly taking them off. It leaves some marks and dents, but that´s pretty easily fixed. I don´t have to repour. And otherwise, it turned into a solid mass without bubbles and cracks, flush to the horn´s walls. Pretty nice. For future builds, I really should do some mix and pour tests.
On another note, back to basic number crunching. The corner horn has a mouth that is a quarter of the size of the straight tractrix horn. I had not really considered what that actually meant, and whether it was a quarter of the size of a full horn mouth. I did kind of assume that having the mouth raised off the floor would reduce floor loading and that maybe a 1/8th sized mouth would be too small. But I have been wondering about it lately.
A full-size hornmouth for a 70Hz horn: 19218 cm^2
A 1/4th hornmouth: 4805 cm^2
a 1/8th hornmouth: 2400cm^2
The Home Constructor's Cornerhorn hornmouth: 1089 cm^2
Clearly, the square tractrix horn does not have a full-size horn. And clearly, the home constructor's horn does not have a full 1/8th sized hornmouth. However, basically every horn that I looked at that extended below 200 Hz had a mouth that didn't follow the theoretical rules for size. Klipsch didn't give the Klipschorn a standard theoretically appropriate hornmouth either.
So basically, what I derive from this, is that Voigt did consider the elevated mouth sufficiently close to the floor to consider it full corner loading. And if rolling your own horn, I would take "close to 1/8th mouthsize" as a guide for sizing the mouth.
I am getting a weird idea of making a version of this type of cornerhorn for my 15 inch Fane fullrangers, with the Klipschorn mouthsize and ballpark Fc but with a tractrix expansion. Add a backchamber instead of a bass pipe, and that would certainly be a very interesting application... ;-)
On another note, back to basic number crunching. The corner horn has a mouth that is a quarter of the size of the straight tractrix horn. I had not really considered what that actually meant, and whether it was a quarter of the size of a full horn mouth. I did kind of assume that having the mouth raised off the floor would reduce floor loading and that maybe a 1/8th sized mouth would be too small. But I have been wondering about it lately.
A full-size hornmouth for a 70Hz horn: 19218 cm^2
A 1/4th hornmouth: 4805 cm^2
a 1/8th hornmouth: 2400cm^2
The Home Constructor's Cornerhorn hornmouth: 1089 cm^2
Clearly, the square tractrix horn does not have a full-size horn. And clearly, the home constructor's horn does not have a full 1/8th sized hornmouth. However, basically every horn that I looked at that extended below 200 Hz had a mouth that didn't follow the theoretical rules for size. Klipsch didn't give the Klipschorn a standard theoretically appropriate hornmouth either.
So basically, what I derive from this, is that Voigt did consider the elevated mouth sufficiently close to the floor to consider it full corner loading. And if rolling your own horn, I would take "close to 1/8th mouthsize" as a guide for sizing the mouth.
I am getting a weird idea of making a version of this type of cornerhorn for my 15 inch Fane fullrangers, with the Klipschorn mouthsize and ballpark Fc but with a tractrix expansion. Add a backchamber instead of a bass pipe, and that would certainly be a very interesting application... ;-)