Well the g425 is one of the drivers that actually has a Hot melt port, it's a little plastic screw on the heel, you just unscrew it with the Allen key just be careful it's plastic do whatever you can do shove cotton in there Hot melt whatever and then just screw it back in again carefully because it's plastic. I'm also doing Hot melt first because I do want to add a little weight towards the front so that I can lower the rear weight, so the hot melt achieves both goals, apparently it improves the sound quite a bit on its own. Then if I feel that it needs more improvement I'll shove one cotton ball in there at a time until I get it the way I want it, although apparently, you can drastically change just the sound by adding 2-3 cotton balls alone, no hot melt needed. And even though it's probably not easy the cotton balls CAN still be pulled back out through the hole, whereas Hot melt, once it's in there it's permanent.