]] In geometry, coaxial means that two or more forms share a common axis; it is the three-dimensional linear analog of "concentric". Coaxial cable, as a common example, has a wire conductor in the center (D) a circumferential outer conductor (B) and an insulating medium called the dielectric (C) separating these two conductors. The outer conductor is usually sheathed in a protective PVC outer jacket (A). The dimension and material of the conductors and insulation determine the cables characteristic impedance and attenuation at various frequencies. In loudspeaker design, coaxial refers to a loudspeaker system in which the individual driver units radiate sound from the same point or axis. This is achieved by placing the high-frequency unit in the centre of the low-frequency driver, rather than having the two radiating from separate spaces. Altec Lansing pioneered the design with their 601 and 604 "duplex" (Altec's

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