JBL LSR4328P Pak Bi-amplified monitor with JBL DSP-enabled RMC Room Mode Correction system. 8 inch polymer-coated fiber low-frequency transducer with self-shielded neodymium magnet structure 1 inch soft-dome tweeter with self-shielded neodymium magnet structure and ferro fluid cooling 150 watts amplification for LF 70 watts amplification for HF