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.
