That shattering thing that happens on a good dub re Ord. These inter iews I'm doing talk about how the valves need a warm up, they take a few hours to hold the vibration, then they get it, and it's that ghost in the machine.
One guy talks about how after the dance, they had to wrap the valves in blankets and take them down last, cos they were so delicate, we're still vibrating hours after.