This speaker is tuned to the enclosure and gives you the same outstanding sound reproduction in every room, in every install. Don't let the small size fool you! These 4" enclosed ceiling speakers are dual ported and tuned to the enclosure, which adds that little extra thump that is missing on open back ceiling speakers. These are perfect for mounting in ceilings that have an attic above with blown in insulation. Frequency response 60Hz to 20kHz, power handling 20 watts RMS/40 watts max. Cutout dimensions: 6-5/8" round x 5-7/8" deep, overall dimensions: 8-1/2" round x 5-7/8" deep. System includes one speaker, removable steel mesh grills, built-in mounting brackets, hardware, and installation instructions.