Bass reflex
（重定向自Reflex enclosure）
![](/Images/godic/202502/06/Bass_reflex_spk4018.PNG")
![RCA Bass Reflex shelf stereo speakers](/Images/godic/202502/06/RCA2ways4018.jpg")
![Two inch flared port tube installed in the top of a Polk S10 speaker cabinet as part of a DIY audio project](/Images/godic/202502/06/Flared_Port_Tube_2_inch4019.jpg")
![Bass reflex vent.](/Images/godic/202502/06/Bassreflexrohr4019.jpg")
A bass reflex system (also known as a ported, vented box or reflex port) is a type of loudspeaker enclosure that uses the sound from the rear side of the diaphragm to increase the efficiency of the system at low frequencies as compared to a typical closed box loudspeaker or an infinite baffle mounting.