Originally made for Teac CD-X60I system but can be used with other systems. This lot is for speakers only. Subwoofer is Active (plugs in to AC outlet) and uses a mono mini to connect to amplifier that has mini 1/8" subwoofer output. Flat Panel NXT speakers connect via stripped wire to the back of left and right of your amplifier. Rated at maximum 10W at 4 ohms.