The speaker two speaker grilles are attached magnetically so when they are removed, the look of the speaker is not dimished by posts or holes. Behind the upper speaker grill, there is a 0.75" tweeter and a 4.5" midrange, both of which are mated to a 90° x 60° Tractrix horn for an extended high frequency response. Behind the lower grill, there are three 7" hybrid cone woofers that are powered by a unique three-part neodymium magnet structure with dual stabilizing rings that reduce nonlinear flux. The three ports in the rear of the speaker enhance the superior bass response. These speakers are designed to produce a higher dB output with the same about of power input as average speakers, saving energy use by up to 75%. Unlike many other speakers in this range, the P-37F does not use off-the-shelf drivers; Klipsh has put years of engineering into their driver designs for optimal speaker performance. The Klipsch P-37F is sold as a pair for $8,000.