This engine was noticeably quieter than the previous engines. In jazz, some drummers use brushes for a smoother, quieter sound. These helicopters were faster, quieter, and safer. Aircraft noise can be reduced by using quieter jet engines. They advertise the motor being highly energy efficient and quieter than most fans. They were aimed at those wanting a quieter, more relaxed holiday. Both male and female mockingbirds sing, with the latter being generally quieter and less vocal. These models were more refined than earlier Ferraris, quieter and easier to drive. This results in a very muffled and much quieter sound. This variant is considerably quieter than a standard Mk II and accurate to . Newer manufacturing techniques allow for curved teeth that are quieter and last longer. It also resulted in a much quieter sound. They claim quieter and quicker engine restart within 0.35 seconds. Maadi has a reputation for being green, quieter and more relaxed than urban Cairo. New sound insulation made the Ambassador even quieter.