The X15 HiQ is an active coaxial system designed as a refe- rence stage monitor. The enclosure features a 3’’ diaphragm compression driver coaxially-loaded by a 15’’ low frequency transducer in a bass-reflex cabinet. The L-Vents laminar vented ports reduce turbulence and port noise at high levels to increase LF efficiency. The X15 HiQ operates from 55 Hz to 20 kHz. The coaxial trans- ducer arrangement and its ellipsoid waveguide produce a 40° x 60° directivity pattern with a smooth tonal response free of secondary lobes over the entire frequency range. As a result, X15 HiQ boasts an exceptional immunity to feedback. The L-Acoustics amplified controllers ensure the advanced cros- sover functions, time alignment, linearization and L-Drive protec- tion of the transducers.