Niles CM610 (FG01294) 2-Way 6-inch Ceiling Mount Speakers - Pair 8 Ohm Nominal; 6 Ohm Minimum Recommended Amplifier Power: 5 To 50 Watts Frame Dimensions: 7 3/4 Inches Hole Cutout Dimensions: 6 1/2 Inches Depth Behind Ceiling: 3 5/8 Inches