Polk Audio V60 High Performance Vanishing In-Ceiling Speakers (4 Pack) This Bundle Includes (4) Polk Audio V60 In-Ceiling Loudspeakers 6 " Dynamic Balance polypropylene cones deliver spectacular midrange clarity, punchy bass and high efficiency Swivel mount high-performance " aimable silk dome tweeter for crisp, clear imaging Electrical - Recommended Amplifier Power 10/100w/Ch Electrical - Max Sensitivity 89dB