Klipsch Palladium 4.5 Midrange Replacement Speaker for the following model speakers P-39F, P-38F, P-37F, P-17B, P-27C These were removed from a pair of Pallidum P-39F Floor Standing Speakers. These are in good working order. Please see pics for cosmic condition. The pics are a combination of the 2 speakers we have in-stock at time of listing. Description from owners manual: Midrange - “The midrange is where we live.” Paul W. Klipsch The inverted dome midrange driver operates from 500 Hz to 3.5 kHz and is a unique design, not found on any previous Klipsch product. The driver sensitivity of 106 dB allows minimal excursion at normal playback volume. As cone excursion reduces, so does distortion. The 4.5-inch aluminum dome is driven by 3 high temperature N35H neodymium magnets, ensuring linearity under a range of listening volumes. The pole piece is topped by a copper cap to minimize unwanted inductive components. The surround has half the density of the material typically used and thus offers reduced mass. Unlike most designs, this midrange driver delivers much more output from the dome and less from the surround. As a surround is always in motion and always changing shape, output from its surface is high in distortion—minimizing surround surface area is another means to reducing overall distortion. The midrange unit is housed in its own magnetically-shielded sealed enclosure, which isolates the driver from acoustic energy generated by the woofers. Every effort has been made to ensure great accuracy, as well as long-term durability from this unique driver.