New project preparation

[yggdrasil]

I have been helping a friend of mine getting started with a nice little 3-way project.

2235's (not yet acquired), 2425's and 2405's.

We wanted to crossover at 6-800Hz and 8-10KHz. The smith horn was not an alternative since it would be very large (wide) when redesigned for 1" driver and a crossover frequency of 6-800Hz.

He liked the look of the Altec 811, so we took a tractrix contour and recalculated it into a sectoral / biradial horn.

I have made a prototype from particle board with my belt sander.

The first response graph is really encouraging. Will probably make jig for routing the profiles more accurate.

The horn has been painted black since this photo. I took measurements before and after painting. The paint smoothened the response curve.

I have not played music on it yet, but hope to do so soon.

[norealtalent]

More pics, more pics, please more pics...

[yggdrasil]

I've made a jig for routing these horns. Still a lot of work routing, but the shape of the horns is more accurate.


I have made one new horn using the jig.

There is a hump from 700 to 1500Hz. Not sure why. They also roll off a little early. The Smith prototypes also had the same problem, so I will make a new mounting plates and try to smoothen the throat a little.

For the moment they are replacing the smith's in my 4-way setup. With the 2425 drivers. In this setup they play 1200-7000Hz. First impression is good. Will be back with more impressions later.

[Rolf]

I've made a jig for routing these horns. Still a lot of work routing, but the shape of the horns is more accurate.


I have made one new horn using the jig.

There is a hump from 700 to 1500Hz. Not sure why. They also roll off a little early. The Smith prototypes also had the same problem, so I will make a new mounting plates and try to smoothen the throat a little.

For the moment they are replacing the smith's in my 4-way setup. With the 2425 drivers. In this setup they play 1200-7000Hz. First impression is good. Will be back with more impressions later.

You are quite a wood-wizard Johnny...

Rolf

[Flodstroem]

yggdrasil! Im impressed

Very nice home made milling machine for the routing process. I can see that you could make any sizes of horn mouth in this jig.

Do you have any "blue prints" of it ? If yes, could you send me a PM ?

Regards

[yggdrasil]

The project have been finished a couple of months now. Things really do take time.....

Here's a couple of pictures a while back. The 2405's have gotten their own stands and both the stands and the mid-horns have the same finish as the main cabinets.

I have attached the frequency response of the mid - hf section. It is an average of ~50 samples, no other smoothing.

[yggdrasil]

I designed the crossover with 24dB slopes on both the 2425 and 2405 while giving the 2235 12dB slopes.

I added zobels on all drivers.

The l-pads are built with resistors (other values than in the drawing), and are chosen by measuring and listening.

[JBLCanuck]

I've made a jig for routing these horns. Still a lot of work routing, but the shape of the horns is more accurate.
I have made one new horn using the jig.

Very innovative fabricating there YG