DAS ACTION-525A - Active 2-Way Dual 15-Inch Loudspeaker (Black)ACTION 525A is an active system composed of two 15MI speakers that deliver a greater SPL than the simple 15 plus enhanced bass for events that require both powerful sound and simple adjustment. As part of our company culture, all our systems are developed under a single philosophy: to deliver the highest possible quality in terms of both materials and overall system design. In the ACTION 500 series we use the same birch plywood as our touring systems