A bass reflex loudspeaker system capable of an optimized sub-bass (<100 Hz) response. The loudspeaker system incorporates a closed cabinet (10), an electromechanical driver (22), an acoustic radial transmission line (12), a reactive alternate density transmission medium (18) load, and a radial right angle wave guide (16). The acoustic radial transmission line (VARTL) is disposed around and in front of the cone of the driver. The alternate density transmission medium (ADTM) slows the speed of the wave, thereby causing delay and intentional attenuation of the initial waveform. The radial right angle wave guide (RRAWG) acts as a port and is disposed within the VARTL to introduce a signal into the throat of the VARTL. In addition, the loudspeaker system effectively reduces mechanical vibrations that are normally transferred to the speaker cabinet by effecting a lack of unbalanced pressures.