CTX57 - Image Dynamics 5"x7" 2-Way Speakers with Silk Tweeters Size: 5" x 7" | Voice coil (Single or dual): Single | Voice coil impedance (ohms): 4 | Voice coil Diameter (inches/mm): 1 Recommended Power Range: (watts) 5 to 75 | Impedence: 4-Ohm | Power: 70 Watts | Sensitivity: 90 dB | Frequency Response: 65Hz-22kHz Mounting Diameter Midbass (inches/mm): Standard | Mounting Depth Midbass (inches/mm): 2.32/58.93 | Depth: 2.50"