Amplifiers from 75 to 300 Watts are appropriate power for XR50. An additional connection passes on Meter Illumination Control for compatible power amplifiers. When connecting the XR50 3-way bookshelf speaker to an amplifier, it is important to use cables of adequate size so that there is no signal loss. This bookshelf speaker can be used in both stereo music and home theater systems. Contact your local dealer to learn more.