Starting a new thread because I'm actually really curious about the Sony R10 and want to keep that one on-topic, talk of CNCed steps in the cups and all LOL, didn't think about that! I'd always somehow assumed that the dummy heads would have something in them on account of how they're supposed to be representative of actual human heads; last I checked most people not deeply involved in politics or showbiz generally have stuff mass-loading the skull, haha. I dunno about headband resonances not transferring any bass, though. How easily do human heads transmit sound? Guessing that LFE might be more likely to pass through the hodgepodge of bone, flesh, and viscera that we are. Given the dangerous nature into research on infrasound, specifically its effects on the human body because of its potential as a WOMD, it's understandably hard to find literature on the topic, the closest I can get with a brief search being: https://phys.org/news/2016-10-scientists-effects-infrasonic-vibrations-humans.html .... which states that the human body produces infrasound via natural physiological processes e.g. cardiovascular circulation and brain activity. This is getting down to ridiculously minute detail and I honestly doubt people are gonna take this much care to look into something for recreational listening, but I've always been curious about the effect these body sounds have on perceived listening. Chances are remarkably high that it's just more stuff our brains shove out of our perception though; maybe it's no mistake that our bodies produce sounds that are below what is commonly accepted as the threshold of human hearing (20Hz). I think the problem here is that with few exceptions the people in this hobby don't have access to perfect simulacra of human heads (how close does ballistics gel get? MIGHT know where I can score some), so a lot of this is going to be difficult to determine unless you shove microphones through someone's sinus through their Eustachian tubes and just have mic diaphragms take the place of their eardrums. Good luck getting THAT past an ethics board. Just thinking about it, shouldn't headband coupling with skull (assuming proper fit) dampen most sounds, and any cross-channel contamination would then have more to do with sound transmitted via air surrounding the head? I shudder to think at the volumes one must listen to to get that much of an effect. Spent a bit of time looking for research but came up empty, maybe because no one's bothered with something this close to quartz purity nervosa.