The Sequis Motherload is a possible answer to my volume problems. The newest version of it is about five hundred US dollars.
Another option is just to build an isolation cabinet. It has occurred to me that actually building the box is not something I'm either terribly good at or have room to do. It might be cheaper and simpler to start with a shipping crate.
If I did start with a shipping crate I'd still have to punch holes in it for the 1/4" speaker jack and the XLR cable for a microphone. Then I'd have to silicone the joints and then figure out a way to make the top come on and off yet still create an air seal when closed. The inside would need to be lined with some sort of noise-dampening foam.
Oof. The Elemental looks better and better from that standpoint.
But I would be able to record my very nice Celestion Alnico Blues if I had an isolation cabinet. Or I could just do those recordings at my studio.