Surround yourself in blasting music with the Martin Logan Motion 4I Loudspeakers. Theyy feature motion tweeters and powerful bass technology that render clarity and detail to the sound. The tweeters consist of light-weighted diaphragm that give super-fast frequency response of 70-23000 Hz. These bookshelf speakers operate around 20-150 watts per channel Recommended Amplifier Power and 2900 Hz Crossover Frequency. It can be easily installed on table top walls or even upside down. For seamless sonic rendition the Martin Logan Motion 4I Loudspeakers uses Precision Vojtko crossover topology that features custom air-core coil inductors low DCR steel laminate inductors low DF capacitors and polyester film .