The Solutions 4.0 ported ceiling speaker is a four inch coaxial design, which offers a warm, pleasing full range sound while achieving well defined high end frequency response. The Solutions 4.0 can be retrofitted into any hard lid or drop tile ceiling. The speaker has a very low profile grille and the entire enclosure is only four inches deep, which allows it to fit into many spaces where other speakers just don't have room. A 3/4" swivel tweeter and a selector switch that allows either 8 ohm or 70/100 volt variable wattage taps makes this a superior entry-level speaker for either home or commercial applications. It also comes pair packed with all mounting hardware, including an ingenious grille puller that doubles as a wattage tap adjusting tool.