This tower loudspeaker from Definitive Technology acts as a single, bipolar speaker, delivering remarkably crisp sound in the 22 Hz to 30 kHz frequency range. The impedance of the Definitive Technology rear speaker is 8 ohms and its sensitivity is rated at 91 dB. The tower loudspeaker's drivers are configured in a four-element arrangement, with two aluminum dome one-inch tweeters and two mineral-filled homopolymer-coned cast-magnesium basket midrange/bass drivers, each measuring 5 1/4 inches. The polypropylene drivers of this Definitive Technology rear speaker reach a maximum speaker depth of 11 inches. The Definitive Technology BP8 reaches a height of 38 inches, and measures 11 inches by 7 inches in footprint area. The device is finished in a sleek, piano-gloss black, with a wraparound speaker grill to protect the drivers. The drivers used in the Definitive Technology BP8 are the same units used in Definitive’s flagship BP7000 Series, meaning the Definitive Technology rear speaker uses a sharp, ultra-clear moving-coil setup. The drivers are designed to ensure perfect linear movement, resulting in a pleasurable, low-distortion listening experience.