DAS Audio ALTEA-712 12-Inch Passive SpeakerThe ALTEA 712 passive system allows users to choose the powering option they prefer and is designed for use with external amplification and outboard DSP. This system benefits from the high performance transducers include the DAS 12F loudspeaker, which provides accurate low frequency reproduction with a deep, powerful bass. High frequencies are handled by the brilliant M 28 FEM optimized compression driver with 1" exit providing exceptional performance