Ever think of building a Cornu Spiral horn? Now you can!

[Coen]

The drivers have arrived! I'm listening to them now, it seems like there is almost no bass. Guess i'm to used to listening to the cornus, even though the fountek drivers are smaller the difference is night and day. I hope these will sound even better when they're finished.

I also decided on using another type of glue for putting the front panel on. The poly urethane is just to messy and (as far as i could see) had a chance of leaving gaps. I did some tests and construction glue works really well with mdf & foam. Waiting for the paint to dry atm, i'll glue it on this evening.

 

[xrk971]

Coen,
You say the FE103's have no bass in a Cornu or in open air? What size are you making? You have a set of Fountek Cornu's already? I forget. Nice construction by the way.

 

[Coen]

Coen,
You say the FE103's have no bass in a Cornu or in open air? What size are you making? You have a set of Fountek Cornu's already? I forget. Nice construction by the way.

Thanks Just listening to FE103s in open air. I made the 2 fountek cornus already, 3 inch driver in a 20inch cornu. The cornu i'm making for the FE103 is 24inch wide and 8cm deep.

 

[xrk971]

Oh, no worries then - open air has no bass as it self cancels the front and rear pressure waves. I think you should be good once you pop the drivers in. One of my favorite tests is to have the driver wired but sitting slightly out of enclosure and playing music. Then insert it into enclosure and the moment it makes a seal - Ta Dah! (or Shazam!, whatever your exclamation saying may be )

 

[Coen]

Oh, no worries then - open air has no bass as it self cancels the front and rear pressure waves. I think you should be good once you pop the drivers in. One of my favorite tests is to have the driver wired but sitting slightly out of enclosure and playing music. Then insert it into enclosure and the moment it makes a seal - Ta Dah! (or Shazam!, whatever your exclamation saying may be )

I know what you mean last time i had 1 driver in the enclosure connected and the other in open air, then switch between them by changing the balance for left and right.

Just finished glueing on the front, hope this works

 

[grandcalmar]

Thanks I made the 2 fountek cornus already, 3 inch driver in a 20inch cornu.

Which Founteks and how do they sound?

Cheers!

 

[Cal Weldon]

Looking good there Coen.

 

[Cal Weldon]

For anyone interested, I have to say that I will not build the smaller ones anymore. Once you build the larger units, you'll see why. The differences between the 20", 27" and 36" are staggering. So much so that I don't even bring the little ones out anymore.

 

[Coen]

Which Founteks and how do they sound?

Cheers!

The Fountek FE85, and they sound great. You can check them out at post 1029 - page 103.

For anyone interested, I have to say that I will not build the smaller ones anymore. Once you build the larger units, you'll see why. The differences between the 20", 27" and 36" are staggering. So much so that I don't even bring the little ones out anymore.

Well Cal size isnt everything I´m still enjoying building this pair. But if these work out i´ll start building a 36 inch pair, might need to work on the WAF for those.

 

[Cal Weldon]

I didn't tell anyone else not to build them. It's good to build a small one to get your feet wet before tackling a 36" or heaven forbid, larger.

And yes, real men build 'em big!

 

[Coen]

And here is the happy couple and they do sound really good. Can't wait to get them up on the wall. The construction glue allso works really well, i can recommend it over the polyurethane glue.

 

[xrk971]

Nice work Coen! Remind us what driver that is and what size you ended up making?

 

[Cal Weldon]

Sure looks like a Fostex to me.

+1 on what X said.

 

[Coen]

Nice work Coen! Remind us what driver that is and what size you ended up making?

Thanks It's a fostex FE103En in a 60cm / 24inch wide 8cm / 3.14inch deep cornu. The drivers had matching screws but they where to large for the 5mm thick front, so now i'm stuck with these ugly ones untill i can find something better

 

[Coen]

Ok, i decided to do something about the screws today since the rvs ones are terrible for the WAF.

As you can see the screws that came with the drivers have a non threaded part which is about the size of the mdf i used..

After visiting a few stores i found out no-one is selling nice and shiny black round screws, so i got the next best thing.. nice and shiny gold looking ones...

which will probably still look ugly when used with the drives, but on the up side: the shape looks about right.

So then i got these, the cheapest spray paint i could find

Now this is with a few base coats

And then with the black finish.

Waiting for the paint to dry... They almost look like the original ones now, i just hope the paint doesn't come off when i screw them in

 

[Cal Weldon]

I think I might have just glued small pieces of MDF to the backside of the baffle so I could use the original screws.

 

[Coen]

because the driver is a little larger then the original mounting hole and with the square shape it, the screw holes are almost on top of the foam. Making it very hard to glue something in ..and this is more fun.

 

[Coen]

Screwing them in did damage the paint a little, but that is only noticable from up close. Problem solved

 

[xrk971]

Looks great Coen! Tip: use a black Sharpie permanent marker to touch up the paint.

 

[tfcx]

Looks great Coen! Tip: use a black Sharpie permanent marker to touch up the paint.

Also(for next time), you might try putting a piece of masking tape on the screwdriver tip prior to driving the screws.