For now I think the one you have will do - I am planning using my GPA drivers 1.4” -They are heavy so will be going for a wood one similar to the Joseph Crowe 290 biradial that easily sits on large cabinet. the STL file is just a surface so whilst I can open it in onshape I cannot slice it or join up the surface - Im hoping that a step file of a proper 3d model with actual thickness allows more. Its more of a process check at the moment cheers
Thanks! Yeah just downloading now. For some reason it kept putting me on the USA website asking me to go to the local site and kicking me off the page.
1 Like
Two things:
1 my horns are 2", so won’t work. It’s a matter of a few minutes to do something that might actually be useful to you.
2 the file you need will be just the horn profile, then you can thicken it and build the stuff for your mounting etc
OK cheers perfect
I’ve emailed you a 330Hz IWATA horn with a 1.4" throat, have fun!
3 Likes
10 Likes
Useful in a ‘take all my space and money’ kind of way?
Brill - I have managed to load this after a bit of head scratching (Likely down to my lack of understanding) Many thanks Adam. It’s now a solid object in onshape.
I now need to manually add in some sort of support
1 Like
Nice Did you get that from US or UK?
uk, from here,
https://www.lean-business.co.uk/eshop/
1 Like
When is the elliptical lecleach MEH horn being done?
Deleted
My understanding is the throat like the picture above is too long so you end up messing up the less than 1/4 wavelength thing.
Having had longer throated horns and often convincing myself they sounded horny and dare I say a tiny bit honky at times (probably my imagination or when awakening from a dream/mare about their sound😂).
Le Cleách is the most forgiving..
Thus MEH things gravitate towards shorter faster opening creations.
The crinkly cat bum designs are of that ilk.
Would love to hear them someday.
Waveguides are similar antidotes to long throated horniness in the one horn one driver world..
1 Like
But Shirley the shortest fastest opening would be a flat surface?
Counterproductive as there is no horn loading efficiency and compression drivers just blowup, unless played at very low volume.
Open baffle meh 
box with passive radiators meh
They can achieve 1/4 wavelength distance between drivers though.
MEH can tick all the boxes🙂
Forgot perhaps the main reason last night.
There are no corners for the taps and ports to be placed in out of the way in areas of low pressure.
You get Helmholtz resonance (wind throb) and other nasties that mess up the freq resp smoothness.
I think that’s why the MEHs without corners are deeply rippled - to find the lowest pressure spots to put the taps and ports in.
Not sure how successful they are?
I taped over my MF taps and measured the HF and compared that with taps open.
Bugger all difference.
Square / rect MEH works!
They do not target the dips do they!
Quite the opposite. They know what they are doing no doubt by measurement.
The shape can affect things.
They’ve been debating this for ages on DIYAudio, ZZzzzz.
Even putting a profiled mesh grille over them to minimise disruption.
I’m happy with my corners 
