Hey, if you good at SnS then do that, but if your not good with them, then just fight it.
If your not good with SnS, then just fight it, wihtout worrying about the sound.
I just soloed the dual tigrex (yay) without High grade ear plugs.
Finally, if your going to get hit by the roar just get to a spot around it that it can't hit or takes time to hit that spot.
EX. if your fighting the Rathalos, then just dive next to/behind it.