Speco's 12 inch weatherproof aluminum PA speaker offers a frequency response of 150 to 15,000 Hz and a 30 watt RMS/65 watt maximum power rating. It features a sensitivity of 110 dB with an impedance of 8 ohm. A mounting bracket is included. Technical Specifications Dimensions 12" (Dia) x 12" (L) Frequency Response 150-15,000 Hz Impedance 8 Ohm Material Aluminum Max Power 65 Watts Mounting Bracket Included RMS Power 30 Watts Sensitivity (1W/1M) 115 dB

If You're Going to use this for Your CB Radio, You'll Need This  SPW10P