Ninja Foodi MAX 15-in-1 noise level

Hello guys, so I purchased OL750 to replace my OL500 because of 1 lid instead of too and slightly smaller size, but my question is your unit sound like a jet engine? My OL500 (with 2 lids) is loud, but this one is louder. I measure it with phone mic and yes there is difference in like 5-7 db (I know phone is inaccurate). but just curious whether my unit is faulty or that's the way they sound?