GordonKirkwood

KyungYun, Congratulations on your successful realization of my bubble iris mechanism! With such an elaborate and technically challenging project it is rare that someone repeats it, so I hope you will share a picture or two on the "I made this" link from https://www.instructables.com/id/CNC-bubble-machin...Regards, Gordon

I presume you have spoken/sung through the horn; I am always impressed with how the improved coupling of vocal chords to the air results in a tangible sensation of singing in a more viscous medium; Do you feel your vocal chords differently while singing/speaking through it?

I'd love to see the plots if you're inclined to share them!

AWESOME! Your welds are gorgeous, too. Is that stainless??! I like the speaker array and mounting fixtures. Did you enjoy using it as a megaphone before mounting the speakers? I recently downsized and gave the giant 4' long aluminum version of this I made to the FIRST Robotics team I coached, at the Sarah Heinz House in Pittsburgh PA. They use it now to learn about impedance matching, and of course magnify their voices...