Single Barrel Speaker with Polk DB651 6.5" speaker features swivel-mount tweeter that allows precise aiming of sound. Polymer/Mica composite cone with butyl rubber surround offers big sound and durability. Speaker features 60 watts continuous RMS and 180 watts peak power handling with 4-ohm impedance. Polished and anodized aluminum finish remains durable in marine settings. Speaker will fit any size diameter tower.