The ultra-compact AC15 and AC25 models include a 1" dome tweeter, while the AC16, AC26, AC18, and AC28 models feature 1" exit compression drivers, providing sonic clarity and crisp detail. Furthermore, the AC18 and AC28, featuring JBL's Progressive TransitionTM Rotatable Waveguides, offer the system designer a choice of coverage patterns in either 90° x 50° or 120° x 60° configurations.