The L300 is the home entertainment version of the 4333 Studio Monitor—one of the most successful loud— speaker designs JBL has produced for the recording industry.
In its working dress at the studio, or in its decorous expression for the home, the acoustical performance is identical: engineered to provide the mighty reserves of sound power, broad bandwidth and undistorted response demanded by the professional producer and the discriminating amateur alike.
Link to PDF: JBL L300 HiFi System