No? But awesome maybe? I wouldn't mind a
vape that could deafen those around me the more I vaped it, but I'm going to go with "no" all my Sirens have been spectacularly silent. I'm going to agree on opening the airflow more, I've gotten the occasional "hiss" out of one of mine with the airflow really closed down, but as to wattage I will defer to Izan on that.
I have 0.666 build Clapton in one of my Sirens (it was supposed to be um, 0.9 only I unwrapped a leg) and I vape it at an all powerful 16.7 watts, so I'm just gonna go with.... experiment. The vape is perfectly great that way so other than checking all my legs were tight (and I use rayon) well, it's been totally quiet, honestly.
Anna