I sent Ralf a video of the DIY prototype build we did so far for FluxTech. We have a 3D printed compliance chamber. One of the main things that I think finally got it working properly is that we used it to have a second internal membrane to stop Gideon (mass) streaming. I haven’t taken the time yet to take the stls into a CAD session and really see what’s going on, but I don’t see an internal membrane to stop mass streaming, I wonder why it isn’t necessary in your case?
For us we have a funny solution of a balloon over the lip of the pipe fit with an o-ring so it stays between the pipe and the 3D printed part and keeps a seal. There’s a little clamp on the end of it and a bar so you can pull the end of the balloon to change the tension and “tune” it so that is passes the acoustic wave. Surely not a very efficient way to do it, but it works and was fun to design. I’ll try to get some pictures when I get a chance.
I’m also interested that the power membrane doesn’t look easily tuneable, I can recommend building it like a drum head like how we did, it’s a pretty natural application of existing engineering.
