in the enclosure are two ports 16 and 18 positioned so that one port 16 is positioned lower in the enclosure 12 than the other port 18 lower port 16 is flared inwardly that is interior end 16 i has a larger cross sectional area than the exterior end 16 e upper port 18 is flared outwardly that is exterior end 18 e has a larger cross sectional area than the interior end 18 i for purposes of illustration and explanation the flares of port 16 and 18 are exaggerated actual dimensions of an exemplary port are presented below in the enclosure there are heat producing elements the heat producing elements may include the motor structure 15 of the acoustic driver or an optional heat producing device 20 such as a power supply or amplifier for loudspeaker 10 or for another loudspeaker not shown or both optional heat producing device 20 may be positioned lower than upper port 18 for better results it may be advantageous to remove heat from motor structure 15 positioning it lower than upper port 18 for better results in operation a surface such as cone 13 of acoustic driver 14 is driven by motor structure 15 so that the cone 13 vibrates in the direction indicated by arrow 17 radiating sound waves in this case to the exterior 24 of the enclosure and the interior 22 of the enclosure in driving the acoustic driver cone the motor structure 15 generates heat that is introduced into enclosure interior 22 sound waves radiated to the interior 22 of the enclosure result in sound waves radiated out through ports 16 and 18 in addition to the sound waves radiated out through the ports there is a dc airflow as indicated by arrow.