Speaker w/Transformer & Volume Control, Ceiling, Overall Height (In.) 3 1/5 in, Overall Width (In.) 10 3/4 in, Overall Length (In.) 10 3/4 in, Enclosure Color White, Woofer Dia. (In.) 8 in, Woofer Composition Treated Paper, 10 W Watt (RMS), Max. Wattage 15 W, Sensitivity (dB) 91 +/-3, Impedance (Ohms) 8 ohm, Transformer Settings 0.5 W & 0.25 W, 1 W, 2.5 W, 5 W, Frequency Response 90Hz~20kHz