FLUSH MOUNT SPEAKER/155 Wat/ts RMS/ Impedance ………………..3/Sensitivity/Woofer…..87 / dB / W at 1 m/Tweerter….. 97 dB / W at 1M/ Frequency Response/Woofer…. 63Hz~3.300Hz /Tweeter…….3,300Hz~23,000Hz/Cutout Diameter ……. 6-9/16-9-3/8 in. oval/(16.65+23.75 cm oval) Mounting Depth …….. 3-7/16 in. (8.8 cm)