suggestions for The Cornu TML

[ksl]

i have in mind to build a thing like this with visaton drivers

and i have in mind to use these elements
for mids
for highs

any comments?
or other elements?

 

[Nappylady]

Mmmm, sexy....

 

[kneadle]

Go for it

Here's a project I'm doing:

I'm almost done, too. Just trying to get it mounted.

Dave

Oh, and they sound fantastic.

 

[Nappylady]

NEAT!!!

And that's made of mitered pipes! *wow*

*bows down in submission*

One day maybe I'll be half that cool... 🙂

Seriously though. Those must be GREAT for parties! Do you ever have problems like kids pushing in the dustcaps or anything like that?

 

[kneadle]

NEAT!!!

And that's made of mitered pipes! *wow*

*bows down in submission*

One day maybe I'll be half that cool... 🙂

Seriously though. Those must be GREAT for parties! Do you ever have problems like kids pushing in the dustcaps or anything like that?

I'll let you know. I haven't actually unvelied them to the public beyond DIYaudio.com. I posted here in order to encourage TL-enclosures out of pipe, and in order to demonstrate the possibilities.

Kids are on the way...end of April I get my first.

Thanks for the compliments. This was definitely a DIY-team effort, and acknowledgments are first in order when I finally present the finished product to the forum.

Dave

 

[Nappylady]

Hmm.... you're online...

*ponders*

you know, I really ought to list all my contact information in my sig file.

----
AIM: NapalmLady
ICQ: 29072454
MSN: nappynappylady@hotmail.com
Y!: blobeteer

 

[MJK]

Interesting looking speaker design. Definitely would be an eye-catcher as people enter the room.

But there are a couple of things that make me wonder about its claimed performance. I have found that in most cases the cross-sectional area of a straight TL needs to be approximately 3 x Sd (Sd being the drivers cone area). Clearly this design has a cross sectional area of about 1.5 x Sd but no more. I would anticipate a weak bass response based on the geometry shown in the picture. Also, the line length appears to be a little short for the low frequency performance being claimed.

Just my opinion since I have never heard the speaker,

 

[planet10]

the cross-sectional area of a straight TL needs to be approximately 3 x Sd (Sd being the drivers cone area)

Using Rick Shultz's alphaTL calculator (derived from Augspurger's sw for a subset of quarter-wave space that would include the Cornu TL), for the Visaton, i get a 38" long TL with a 7.4" diameter stuffed with 0.27 pounds of polyester stuffing.

dave

 

[kneadle]

Upon looking closer at their description, I'm wondering what kind of material this pipe actually is. They claim that it has good internal damping. I'm having a hard time figuring how that is true.

Pipes, in my experience, like to ring like a chime until you damp them vigorously.

Dave

 

[Battlepriest]

The W100S is a real good middriver. You will have to spend a lot more money, for a better one. But the DT94 is a real awful tweeter! Don't use it! If it has to be Visaton, think of these two:

http://www.visaton.de/deutsch/artikel/art_380.htm
http://www.visaton.de/deutsch/artikel/art_266.htm

Ok, the G20SC is much more expansive but worth the price. The SC10 is even cheaper than the DT94 and much better, as the admin in the Visaton forum said!!! AFAIK it is a Nokia type...

But what about this one:
http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&item=3317126740&category=12903

 

[ksl]

i'm gonna make this design tonight
http://www.geocities.com/qgap/Pipe_Dreams.html

but the open end... should i put something there to reflect the sound waves out?

 

[planet10]

but the open end... should i put something there to reflect the sound waves out?

I don't think that is necessary. I'd stick a wad of damping into the little stubb.

Over on the FR Forum you can find what length of pipe people have found best for the RS 40-1197 (is that what you are going to use?) which IIRC is 44".

If you are using the 1197 a ring of ductseal between magnet & basket kills about 80% of the "issues" the 1197 has.

dave

 

[ksl]

i'm using these mids , and already tried them on and whoa, that was a sound!!!!!!!!

these are old russian drivers (one good thing from old USSR)

thanks for the ductseal hint, planet10

 

[till]

Upon looking closer at their description, I'm wondering what kind of material this pipe actually is. They claim that it has good internal damping. I'm having a hard time figuring how that is true.

As i´m informed, the orange KG Rohr is PVC relatively thin, estimate 3mm. The grey (HT - Rohr) is PP, about 2,5 or 3 mm.

There is also a green kind of KG Rohr, its PP, and much more material. I have 2 pieces of 100mm and 150mm diameter and its about 4.4 and 5.5 mm thick.

 

[ksl]

i'm using grey pipes

 

[kneadle]

I can say with confidence that I have no idea how they can claim that PVC pipe has good internal damping unless they have damped them. Is that what they mean? Otherwise, PVC pipe rings and rings and rings.

Dave

 

[ksl]

READY!!!!
the lower end is awesome

 

[ksl]

at first i made the line 1,5 meter long, which was equal to a quarter wavelength of 58 Hz, now it's 2,7 meters long and this is equal to a quatrer of 40 Hz and the sound more richer. and this design is very very EXCITING