It's been 4 years since I've had them out of their box. I moved from a townhouse into a house and never need to worry about making too much noise anymore. Organs are also not my area of expertise. I've only got 2 organ CDs and one of those is a subsonic laden Hsu demo CD that you feel as much as hear when demoing their subs.
Anyway to try to help answer your question I just went out and got them out of my storeroom and hooked them up and as you'd expect from the Hsu disc playing through really good headphones you get decently deep bass but not the subsonics that rattle your bones. I put on Gaudi's "Bass, Sweat, and Tears" and they're pretty impressive for headphones but I'm just not sure that any headphones are a good choice for deep organ bass. But they were such a treat that I may just start using them once in a while. I wish I could be of more help but I'm not ready to endorse any headphone for organ playback.
