An unquestioned long-term standard D Series amplifiers are found everywhere in the lab on the road in public facilities in the studio and at home. With over 25 years of continual production of the DC-300 amplifier the D Series is an example of Crown's commitment to developing long-term reliable amplifier technology. The D-45 and D-75A are perfect for moderate power applications such as recording or broadcast studio near-field monitoring video suite audio monitoring a recording/broadcast headphone amp or a small paging system. Designed built and carefully checked to ensure reliable operation with a wide variety of loads Crown D Series amplifiers are convection cooled. Their high reliability is particularly important in reducing maintenance costs.