On the stock tubes from ARC with dampers, they are placed high up on the tube but not fully on the silver upper end of the tube. Are there any gains to be had by moving them up, say, the distance of 1 1/2 damper widths so that they sit beyond the translucent part of the tube as opposed to beyond the plate structure?
Tube dampeners on ARC gear ... FREE TWEAK
Here's a cheap (free) tweak for owners of ARC gear using the black tube dampeners. If you move both dampeners as far up toward the top of the tube as possible without having the top one fall off, taking care that both dampeners are solidly touching each other, you will get better dynamics, bass, mids, highs and a lower noise floor. Try it ... you'll like it.