4) NEW MB Quart RKM168 210W 5x7 6x8 Inch Coaxial Car Audio Stereo Speakers Four 4) MBQUART RKM168 5x7 / 6x8 Inch Reference Series Car Audio Speakers (2 Pairs) RMS Power: 55 Watts Per Pair (110 Watt Per 4 Speakers) Peak Power: 110 Watts Per Pair (220 Watt Per 4 Speakers) 4 Ohm Impedance Sensitivy: 89 db