That’s neat.
Construction reminded me a little of some the things I’ve made over the years🙂
These 4 sided ones, I made from laminated birch ply sheets (layer of bitumen damping sheet in the mix).
24mm thick.
Over 2m tall. Went down to 70Hz.
I made all the bolt on bracketry to mount the horns that he then craddled.
Never doing that again🤣
Really don’t know about the resonances
I have modeled a front loading version to aid tinkering - Exactly to your point
We want a large lipped bolt in variable port throat adaptor
so I can try other drivers easily
Would be very cool if a layer of something that damps could be printed sandwiched then carry on with the harder shell..
Easier to sheet the outside…
Leave an air gap with channels for resin or something sort of like a Rocket Nozzle cooling channels?
https://www.instagram.com/p/CLxr7wPsv8V/?utm_source=ig_web_copy_link&igsh=NTc4MTIwNjQ2YQ==
I thought about resin filling - you can have infill profiles that will allow it to flow throughout. However, I decided against this: resin is more expensive than PLA, not actually that much stronger, and more expensive. You might as well just do 100% infill if you’re that bothered!
At this point for me I don’t have the skills to preempt any resonance issues so it will be
simply down to looking at measured distortion levels on the finished product then trial and error adding damping then measuring it again. Wrap around grooves filled with damping stuff to bring rocket science to speaker design - Is a crowd pleaser though.
I have just bought myself a pair large rigid Phenolic horns to sonically compare my diy bits with. Fun days ahead.
Yeah that’s pretty much the reasoning. Even on a warm day where it might only be 25c, PLA will begin to soften if its in direct sunlight. And since the throat adapter has to support the weight of a 3.5kg compression driver off the back of it, you really don’t want it to lose rigidity. I suppose if you’re only going to keep it indoors though it could be fine.
Steve, how big or complex would it be to make some down firing horns that run from 65Hz down to 40Hz with the correct drivers?
I was going to suggest a Punisher 2, either one or two of them.
I’m sure Tris could make something like this
Is this to go below the AERs? If they’re running open baffle then I’d just a chonky 15" or 18" driver in OB underneath.
40Hz straight will be massive/tall + base gap for sound to emanate + driver chamber on top = more and more tall..
As suggested, other ways are better unless you really, really want straight horn bass have a double height ceiling and LWB transit to transport them, or do like Japanman and have them way out into the garden (weather proofed) terminating the mouths in the listening room.
Then DSP to time / phase align.
Volvotret tapped horns are the sensible solution.
Yes, yes, but we want him to build massive straight bass horns, so we can watch..
Tapped horns only going down to 40Hz will be ‘quite’ small. Lots of threads on DIYaudio.
Had been done with 8" and even smaller twin drivers.
It’s that last octave to 20Hz that gets you to the size we have.
Whilst this appeals the blips in the road are A) no garden B) 17th century coach house second floor rented office.
To provide a reference, my mid bass horns are about 2m long and 90cm square at the mouth, and happily go down to 90Hz, although I use them from 100.
The Lab subs are a truncated horn, but still I think they’re 4m long.
@ruprecht you need to change your parameters.
If this is for the AERs, you could either do a 15" OB under them and cross maybe 150Hz, which would save the AERs from stress as well, or do tapped horns below about 80-100
I’m sure I saw Punisher Horn in my yoof. 
Can you go up into the attic and have them venting to your ceiling? 
Imaging huge sectioned snail horns curling around a large attic and down.
Could be removed and ceiling restored on moving out.
Why stop at 40Hz? Go the whole way🙂
Here’s a better pic of the 70Hz I made
Have you gone off MEHs? Latest ATH complex catbum.. with extended flares and twin 12" they get down to 55Hz where the tapped horns take over..
Maybe Andy will print?
Trying to max on an largest size horn flare that can be made in one part.
This is a 250mm x 140mm jobby that I found online - 10hrs printing and 300 grams of filament each. I need to sort out the lines at the top as the flares get closer to horiz - I think there is a way to do this
A friend of mine wants a pair of these Opus12 horns printed, with a 2” throat for the Celestion axi2050.
Could either of you (Adam or Andy) do it or are they too large?
> Website = https://at-horns.eu/opus12.html.
Shop = https://cults3d.com/en/3d-model/various/ath-opus12-designer-s-suite
They will need splitting. Which I think means cleaning up and painting to look nice Give me a few days to review the details - Happy to help - I did outsource my first MEH throats - He might a larger printer -I will check this as well
