STUDIO 6 Theater LCR Cinematic Sound 4 x 5.25" 3-way In-Wall Loudspeaker, 1" (25mm) Compression Driver with HighDefinition Imaging (HDI™) waveguide, 4 x 5.25" (133mm) Polyplas® woofer, Nominal Impedance 6-Ohm, Sensitivity 96dB,Power Handling 100W RMS (400W Dynamic), Recommended Amplifier Power 50W - 150W, Frequency Response 65Hz - 20kHz, Crossover Frequency 2.5kHz, Grille Dimensions (HxW) 7.4" x 26.5" (188mm x 674mm), Cutout Dimensions (HxW) 6.2" x 25.3" (157mm x 642mm),Mounting Depth 3.74in (95mm)