Hi. I may have misinterpreted your comment. I thought you were saying that in general you can't stuff a line after the cabinet is finished. You may have only been referring to the Thor cabinet, which I've never worked with it. I've only heard the Thor once, and that was at a Madisound room at an audio show. It really wasn't set up for critical listening. I just know that a lot of builders weren't happy with the results. Maybe Madisound should have included a tutorial from you, and or shipped the cabinets with a removable baffle.
I see I was vague. I was referring to the Thor. I don't see how you could properly stuff that cabinet when completed.
It really is important that the stuffing not be compressed. It is important to suspend it. The pioneers like Radford, Bailey, Fried and Wright all found that out. They used treated Lambs wool by the way, in that research at Radford Labs, which is heavy and hard to work with. It is very prone to migrate with gravity, so suspension was key.
Firms like PMC use cellular foam substitutes, but if you look at the impedance curves in any third party tests of their designs, there are two impedance peaks. So the lines are not properly damped.
Proper line stuffing is crucial, as Ausperger pointed out. You have to use just enough, and I mean just enough damping, to get one peak of impedance, and NO more. If you look at Joe's article on the Thor, he repeated Ausperger's experiments and also found there was a tight tolerance to the stuffing.
Unfortunately these designs are not easy.
