After decades of creating the best possible loudspeaker components and systems for the professional audio industry, JBL is proud to offer the MPX Series of professional power amplifiers. Night after night, concert after concert, you know you can depend on JBL speakers. Now, with the MPX line, JBL makes it possible to afford the same level of performance and reliability in the rest of your professional sound system. The MPX Series starts with a design platform that has endured years of road use with proven reliability. The patented Grounded Collector® design enhances power transistor cooling by eliminating the need for transistor insulating wafers — the deterioration of which is one of the primary causes of amplifier failure.