A dispensing assembly of a cold beverage, comprising: - a fluid energizing device or fluid pressurizing device (17, 49); - a beverage supply conduit; - an opening and closing tap for closing or opening the beverage supply conduit; - a beverage dispensing conduit, said beverage dispensing conduit delimiting a fluid passage, said fluid passage having a cross section of fluid passage which is transverse to the longitudinal extension thereof; - when open, said tap fluidly connecting said beverage supply conduit to said beverage dispensing conduit; - a dispensing outlet opening or dispensing outlet; - said dispensing outlet being arranged at the end of said dispensing conduit; - an air supply conduit, said air supply conduit delimiting an air passage; - said air supply conduit leading, on one side, directly outside the dispensing assembly, thus avoiding the interposition of return devices or air supply pumps, and said air supply conduit leading, on the opposite side, into said beverage dispensing conduit; - said tap being directly connected to said dispensing outlet by providing a connecting coupling which connects said air supply conduit to said beverage dispensing conduit; characterized in that - said beverage dispensing conduit comprises a Venturi segment between said tap and said outlet wherein, by flowing through the Venturi segment, the fluid passage reduces the cross section thereof and then increases the cross section thereof in the manner of Venturi conduit; - said air supply conduit is engaged in said beverage dispensing conduit in said Venturi segment; and wherein - said fluid energizing device (17, 49) is arranged upstream of said Venturi segment with respect to said dispensing outlet - said Venturi segment is arranged downstream of all beverage pressurizing devices, considering the flow of the beverage; and wherein - said Venturi segment is arranged downstream of all mixing couplings of any fluid, other than air supplied in said Venturi segment, provided in said beverage supply conduit or provided in said beverage dispensing conduit. - a fluid energizing device or fluid pressurizing device (17, 49); - a beverage supply conduit; - an opening and closing tap for closing or opening the beverage supply conduit; - a beverage dispensing conduit, said beverage dispensing conduit delimiting a fluid passage, said fluid passage having a cross section of fluid passage which is transverse to the longitudinal extension thereof; - when open, said tap fluidly connecting said beverage supply conduit to said beverage dispensing conduit; - a dispensing outlet opening or dispensing outlet; - said dispensing outlet being arranged at the end of said dispensing conduit; - an air supply conduit, said air supply conduit delimiting an air passage; - said air supply conduit leading, on one side, directly outside the dispensing assembly, thus avoiding the interposition of return devices or air supply pumps, and said air supply conduit leading, on the opposite side, into said beverage dispensing conduit; - said tap being directly connected to said dispensing outlet by providing a connecting coupling which connects said air supply conduit to said beverage dispensing conduit; characterized in that - said beverage dispensing conduit comprises a Venturi segment between said tap and said outlet wherein, by flowing through the Venturi segment, the fluid passage reduces the cross section thereof and then increases the cross section thereof in the manner of Venturi conduit; - said air supply conduit is engaged in said beverage dispensing conduit in said Venturi segment; and wherein - said fluid energizing device (17, 49) is arranged upstream of said Venturi segment with respect to said dispensing outlet - said Venturi segment is arranged downstream of all beverage pressurizing devices, considering the flow of the beverage; and wherein - said Venturi segment is arranged downstream of all mixing couplings of any fluid, other than air supplied in said Venturi segment, provided in said beverage supply conduit or provided in said beverage dispensing conduit.