Professional-grade JBL M2 Master Reference Monitor system includes two floor-standing speakers and two Crown I-Tech 5000HD power amplifiers housed in a black rack. The speakers feature a black finish with a large D2 dual-diaphragm compression driver and a 15-inch Differential Drive woofer. The rear panel has four gold-plated binding posts for bi-amplified connection. The Crown amplifiers are rack-mounted with digital displays and front-panel controls.