After hearing Mr Coco's conical horns - esp when attached to Vitavox S2 drivers I must say I was impressed.
What sealed it was hearing them in my own home with lash up crossovers - they sounded mighty good! The GRF cab doing all the lovely mid bass and bass stuff of course!
A long informative chat with Mr Coco on what sort of compression drivers would be good set me a researching. One idea was just to get a pair of AH-300's like I'd heard.
Know what i am I getting and all that. But the price tag is quite stiff - $2700 full price and who knows if you get customs and vat on that as well.
Saving up for a pair of nice Vitavox S2's would be pretty expensive too!
Another idea was to have the wood cut by someone like Avon ply but they and all the places I tried ran a mile from this one - I guess too time consuming to do with a realistic price / to Avon's very exacting standards...
So could I cut 24 angled / tapered slats with simple DIY tools in my workshop? They challenge was on!
First some design - I have a pal who is a whiz with cad.
Here is the CAD drawing of what was to be achieved...
From what my CAD pal told me the cut angle needed would be 15 deg, Taper from 124.5mm down to 22.2mm - 0.2 of a mm, nice!
Mr Coco sent me an interesting link to a cool dude who had made similar cones but even bigger
http://sites.google.com/site/diyfirefly/100-hz-multi-sided-conical-midbass-horns
On that site is a link to a cool little calc prog that tells you what cut angle you need for an any number of sides pyramid...
http://jansson.us/jcompound.html
That calc was not saying 15 deg at all but 13.8!
So back to CAD pal who said "It is definitely 15° (hold down Alt + 0176) on the flat faces ... so I did a quick cut through the cone and then measured the resulting face angle - low and behold 13.886°
Didn't think to check that it would be different once off the flat surface, but of course, it will change as the slat is leaning inwards as well."
Out popped the concurring angle!
I was all set - well not quite. 13.88 deg would be hard to dial in on my trusty Wickes circ saw!
Next to mark up some wood and get cutting. I don't like waiting around...
I don't have a saw as cool as the dudes so I used this.
Here is a stack of 12 petals put roughly together...
And once glued together - no fancy clamps - I put PVA glue on all the edges and stood it up like a wigwam and worked it into position. Then put a large stretchy strap around the bottom weighted on for the base and a small one for the top.
Quite strong enough for it to fall from standing up on the thin end and twat the heavy large end on the floor and take it!
That's all for the time being... Tune in later, for more Around the horn!
What sealed it was hearing them in my own home with lash up crossovers - they sounded mighty good! The GRF cab doing all the lovely mid bass and bass stuff of course!
A long informative chat with Mr Coco on what sort of compression drivers would be good set me a researching. One idea was just to get a pair of AH-300's like I'd heard.
Know what i am I getting and all that. But the price tag is quite stiff - $2700 full price and who knows if you get customs and vat on that as well.
Saving up for a pair of nice Vitavox S2's would be pretty expensive too!
Another idea was to have the wood cut by someone like Avon ply but they and all the places I tried ran a mile from this one - I guess too time consuming to do with a realistic price / to Avon's very exacting standards...
So could I cut 24 angled / tapered slats with simple DIY tools in my workshop? They challenge was on!
First some design - I have a pal who is a whiz with cad.
Here is the CAD drawing of what was to be achieved...
From what my CAD pal told me the cut angle needed would be 15 deg, Taper from 124.5mm down to 22.2mm - 0.2 of a mm, nice!
Mr Coco sent me an interesting link to a cool dude who had made similar cones but even bigger
http://sites.google.com/site/diyfirefly/100-hz-multi-sided-conical-midbass-horns
On that site is a link to a cool little calc prog that tells you what cut angle you need for an any number of sides pyramid...
http://jansson.us/jcompound.html
That calc was not saying 15 deg at all but 13.8!
So back to CAD pal who said "It is definitely 15° (hold down Alt + 0176) on the flat faces ... so I did a quick cut through the cone and then measured the resulting face angle - low and behold 13.886°
Didn't think to check that it would be different once off the flat surface, but of course, it will change as the slat is leaning inwards as well."
Out popped the concurring angle!
I was all set - well not quite. 13.88 deg would be hard to dial in on my trusty Wickes circ saw!
Next to mark up some wood and get cutting. I don't like waiting around...
I don't have a saw as cool as the dudes so I used this.
Here is a stack of 12 petals put roughly together...
And once glued together - no fancy clamps - I put PVA glue on all the edges and stood it up like a wigwam and worked it into position. Then put a large stretchy strap around the bottom weighted on for the base and a small one for the top.
Quite strong enough for it to fall from standing up on the thin end and twat the heavy large end on the floor and take it!
That's all for the time being... Tune in later, for more Around the horn!
Last edited by a moderator:
