They sound different than the King Air's, but no one has yet been able to measure them being louder. On take off, the Avanti has been measured at 81.9 dBA, slightly lower than the Beechcraft King Air at 82.8 dBA. This is below FAA stage 3 noise limits which set a maximum of 89 EPNdB for take off. The square sine wave from the exhaust fools people. There are tons of airplanes more loud, so they won't be able to ban them at any airport unless they also want to ban King Air's.
Last edited by AdamFrisch; 21st Sep 2013 at 16:58.