GTO629 6-1/2-inch (165-millimeter) speakers handle a robust 180 watts peak power (60 watts RMS). This much power makes for an ideal match to systems powered with head-unit or factory-amplifier power levels. Even better, the speaker matches many of the GTO Series amplifier combinations. As a result, it can keep up with systems that feature one or more subwoofers. And its great power-handling specifications increase reliability over the lifetime of the speaker. 25 – 180 watts suggested amplifier power range Carbon-Composite Non Magnetic Frame power range: 5-60 watts RMS (180 watts peak power) impedance: 3 ohms - frequency response: 53-21,000 Hz - sensitivity: 93 dB - top-mount depth: 2" - grilles included