Polaroid DPA-07051 7" Dual Screen Portable DVD Player The acoustic centers of the tweeter and mid-bass driver are located in the same plane for superior imaging TL2 satellite aperiodic-tuned rear port enables better blending with a subwoofer TL2 center channel tuned rear port maximizes the low-end response of the dual driver design for superior blending Curved enclosure design employs non-parallel surfaces that not only lead to a stronger This design combines the bass extension of an acoustic suspension enclosure with the mid-bass boost