I haven't had the pleasure of a Penthouse Suite yet, but I have had other cabins just below Lido Deck in several locations and never had a problem with noise.
I have heard others mention that on their balconies, they could sometimes hear music from the activities around the pools during the day; but it was not really a problem.
Hi AC, welcome to Cruise-Chat! Congratulations on the Penthouse. I have not had that pleasure, but can tell you I adored the Emerald. She's a beautiful ship. My favorite place was the Sanctuary. If you go to the Crown Grill, please be sure to try the Black and Blue Onion soup, it is fantastic! Please let us know how it went when you return. Best wishes!