System and method for supplying a pulp suspension to a headbox

for supplying a pulp suspension once or stock feed system to at least one multi-layer headbox, with or without a further dilution device, of a paper or board machine having at least one first dilution device and at least one second dilution device for diluting the pulp suspension with a dilution liquid and at least one means (16) for deaeration of the fiber suspension, said second diluting device - seen in the flow direction of the fiber suspension - behind the venting device (16) of the fibrous suspension is arranged, characterized in that the dilution liquid for the second dilution is not zwangsentluftet.