Thanks, this helped me a lot. Though I edited the code little bit to calculate the difference between the velocitys of the colliding bodies:
var res = Phaser.Point.distance(new Phaser.Point(equation.bodyB.velocity,equation.bodyB.velocity), new Phaser.Point(equation.bodyA.velocity,equation.bodyA.velocity));console.log(res);
So if we have 2 moving objects and they are f.e. free falling and slightly touching each other,the impact would not generate a sound.